Johannes Skaar

• Ryen, Kai; Gulla, Jan & Skaar, Johannes (2022). Strictly Localized Three-Dimensional States Close to Single Photons. International journal of theoretical physics. ISSN 0020-7748. 61(5). doi: 10.1007/s10773-022-05133-7. Fulltekst i vitenarkiv
• Gulla, Jan & Skaar, Johannes (2021). Tunneling times of single photons. Journal of the Optical Society of America. B, Optical physics. ISSN 0740-3224. 38(11), s. 3457–3465. doi: 10.1364/JOSAB.437386. Fulltekst i vitenarkiv Vis sammendrag

  Although the group delay of classical pulses through a barrier may suggest superluminality, the information transfer is limited by the precursor, which propagates at the vacuum light speed. Single photons, however, have infinite tails, and the question of causality becomes meaningless. We solve this problem by introducing strictly localized states close to single photons, which are examples of optical states produced by on-demand single-photon sources. These states can be arbitrarily close to single photons while demonstrating causality for their leading edge.

• Gulla, Jan & Skaar, Johannes (2021). Approaching Single-Photon Pulses. Physical Review Letters. ISSN 0031-9007. 126(7). doi: 10.1103/PhysRevLett.126.073601. Fulltekst i vitenarkiv Vis sammendrag

  Single-photon pulses cannot be generated on demand, due to incompatible requirements of positive frequencies and positive times. Resulting states therefore contain small probabilities for multiphotons. We derive upper and lower bounds for the maximum fidelity of realizable states that approximate single-photon pulses. The bounds have implications for ultrafast optics; the maximum fidelity is low for pulses with few cycles or close to the onset, but increases rapidly as the pulse envelope varies more slowly. We also demonstrate strictly localized states that are close to single photons.

• Skaar, Johannes (2019). Fresnel's equations in statics and quasistatics. European Journal of Physics. ISSN 0143-0807. 40(4). doi: 10.1088/1361-6404/ab166b. Fulltekst i vitenarkiv
• Hågenvik, Hans Olaf & Skaar, Johannes (2019). Magnetic permeability in Fresnel’s equation . Journal of the Optical Society of America. B, Optical physics. ISSN 0740-3224. 36(5), s. 1386–1395. doi: 10.1364/JOSAB.36.001386. Fulltekst i vitenarkiv
• Skaar, Johannes; Hågenvik, Hans Olaf & Dirdal, Christopher Andrew (2019). Four definitions of magnetic permeability for periodic metamaterials. Physical review B (PRB). ISSN 2469-9950. 99(6). doi: 10.1103/PhysRevB.99.064407. Fulltekst i vitenarkiv
• Joshi, Siddarth Koduru; Pienaar, Jacques; Ralph, Timothy C.; Cacciapuoti, Luigi; McCutcheon, Will & Rarity, John [Vis alle 45 forfattere av denne artikkelen] (2018). Space QUEST mission proposal: experimentally testing decoherence due to gravity. New Journal of Physics. ISSN 1367-2630. 20:063016(6), s. 1–22. doi: 10.1088/1367-2630/aac58b. Fulltekst i vitenarkiv
• Dirdal, Christopher Andrew; Hågenvik, Hans Olaf; Haave, Haakon Aamodt & Skaar, Johannes (2018). Higher order multipoles in metamaterial homogenization . IEEE Transactions on Antennas and Propagation. ISSN 0018-926X. 66(11), s. 6403–6407. doi: 10.1109/TAP.2018.2863742. Fulltekst i vitenarkiv
• Dirdal, Christopher Andrew & Skaar, Johannes (2018). Diamagnetism and the dispersion of the magnetic permeability. European Physical Journal B : Condensed Matter Physics. ISSN 1434-6028. 91(6). doi: 10.1140/epjb/e2018-80515-1. Fulltekst i vitenarkiv
• Marøy, Øystein; Makarov, Vadim & Skaar, Johannes (2017). Secure detection in quantum key distribution by real-time calibration of receiver. Quantum Science and Technology. ISSN 2058-9565. 2(4). doi: 10.1088/2058-9565/aa83c9. Fulltekst i vitenarkiv
• Hågenvik, Hans Olaf; Bløtekjær, Kjell & Skaar, Johannes (2017). Dielectric media considered as vacuum with sources. American Journal of Physics (AJP). ISSN 0002-9505. 85(11), s. 830–833. doi: 10.1119/1.5003810. Fulltekst i vitenarkiv
• Svendsen, Guro Kristin; Skaar, Johannes; Weman, Helge & Dupertuis, Marc-André (2015). Symmetries and optical transitions of hexagonal quantum dots in GaAs/AlGaAs nanowires. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 92(20). doi: 10.1103/PhysRevB.92.205303.
• Hågenvik, Hans Olaf & Skaar, Johannes (2015). Fourier-Laplace analysis and instabilities of a gainy slab. Journal of the Optical Society of America. B, Optical physics. ISSN 0740-3224. 32(9), s. 1947–1953. doi: 10.1364/JOSAB.32.001947.
• Hågenvik, Hans Olaf; Malema, Markus Edward & Skaar, Johannes (2015). Fourier theory of linear gain media. Physical Review A. Atomic, Molecular, and Optical Physics (PRA). ISSN 1050-2947. 91(4). doi: 10.1103/PhysRevA.91.043826.
• Dirdal, Christopher Andrew; Bondevik, Tarjei & Skaar, Johannes (2015). Relaxed dispersion constraints and metamaterial effective parameters with physical meaning for all frequencies. Physical Review B. Condensed Matter and Materials Physics. ISSN 1098-0121. 91(13). doi: 10.1103/PhysRevB.91.134102.
• Dirdal, Christopher Andrew & Skaar, Johannes (2015). Superposing Lorentzian resonance functions towards engineering target responses. I Zouhdi, Said; Zheludev, Nikolay & Teng, Jing Hua (Red.), Meta'14 Singapore Proceedings. META conference. ISSN 978-2-9545460-4-9. s. 53–58.
• Bugge, Audun Nystad; Sauge, Sebastien; Ghazali, Aina Mardhiyah M.; Skaar, Johannes; Lydersen, Lars Vincent Van de Wiel & Makarov, Vadim (2014). Laser damage helps the eavesdropper in quantum cryptography. Physical Review Letters. ISSN 0031-9007. 112(7:070503). doi: 10.1103/PhysRevLett.112.070503.
• Marøy, Øystein; Gudmundsen, Magne; Lydersen, Lars Vincent Van de Wiel & Skaar, Johannes (2014). Error estimation, error correction and verification in quantum key distribution. IET Information Security. ISSN 1751-8709. 8(5), s. 277–282. doi: 10.1049/iet-ifs.2012.0333.
• Liu, Qin; Lamas-Linares, Antia; Kurtsiefer, Christian; Skaar, Johannes; Makarov, Vadim & Gerhardt, Ilja (2014). A universal setup for active control of a single-photon detector. Review of Scientific Instruments. ISSN 0034-6748. 85(1). doi: 10.1063/1.4854615.
• Dirdal, Christopher Andrew & Skaar, Johannes (2013). Superpositions of Lorentzians as the class of causal functions. Physical Review A. Atomic, Molecular, and Optical Physics (PRA). ISSN 1050-2947. 88(3). doi: 10.1103/PhysRevA.88.033834.
• Dirdal, Christopher Andrew & Skaar, Johannes (2013). Negative refraction in causal media by evaluating polar paths for rational functions. Journal of the Optical Society of America. B, Optical physics. ISSN 0740-3224. 30(2), s. 370–376. doi: 10.1364/JOSAB.30.000370.
• Svendsen, Guro Kristin; Haakestad, Magnus Willum & Skaar, Johannes (2013). Reciprocity and the scattering matrix of waveguide modes. Physical Review A. Atomic, Molecular, and Optical Physics (PRA). ISSN 1050-2947. 87(1). doi: 10.1103/PhysRevA.87.013838.
• Skaar, Johannes & Haakestad, Magnus Willum (2012). Inverse scattering of dispersive stratified structures. Journal of the Optical Society of America. B, Optical physics. ISSN 0740-3224. 29(9), s. 2438–2445. doi: 10.1364/JOSAB.29.002438. Vis sammendrag

  We consider the inverse-scattering problem of retrieving the structural parameters of a stratified medium consisting of dispersive materials, given knowledge of the complex reflection coefficient in a finite frequency range. It is shown that the inverse-scattering problem does not have a unique solution in general. When the dispersion is sufficiently small, such that the time-domain Fresnel reflections have durations less than the round-trip time in the layers, the solution is unique and can be found by layer peeling. Numerical examples with dispersive and lossy media are given, demonstrating the usefulness of the method for, e.g., terahertz technology.

• Svendsen, Guro Kristin; Weman, Helge & Skaar, Johannes (2012). Investigations of Bragg reflectors in nanowire lasers. Journal of Applied Physics. ISSN 0021-8979. 111(12). doi: 10.1063/1.4729529.
• Grepstad, Jon Olav & Skaar, Johannes (2011). Does evanescent gain exist? I Stone, W. Ross (Red.), Proceedings of the XXXth URSI General Assembly in Istanbul (August 2011). IEEE conference proceedings. ISSN 978-1-4244-5117-3. doi: 10.1109/ursigass.2011.6123712.
• Grepstad, Jon Olav & Skaar, Johannes (2011). Total internal reflection and evanescent gain. Optics Express. ISSN 1094-4087. 19(22), s. 21404–21418. doi: 10.1364/OE.19.021404. Fulltekst i vitenarkiv
• Lydersen, Lars Vincent Van de Wiel; Akhlaghi, Mohsen K.; Majedi, A. Hamed; Skaar, Johannes & Makarov, Vadim (2011). Controlling a superconducting nanowire single-photon detector using tailored bright illumination. New Journal of Physics. ISSN 1367-2630. 13. doi: 10.1088/1367-2630/13/11/113042. Fulltekst i vitenarkiv
• Sauge, Sebastien; Lydersen, Lars Vincent Van de Wiel; Anisimov, Andrey; Skaar, Johannes & Makarov, Vadim (2011). Controlling an actively-quenched single photon detector with bright light. Optics Express. ISSN 1094-4087. 19, s. 23590–23600. doi: 10.1364/OE.19.023590. Fulltekst i vitenarkiv
• Gerhardt, Ilja; Liu, Qin; Lamas-linares, Antia; Skaar, Johannes; Scarani, Valerio & Makarov, Vadim [Vis alle 7 forfattere av denne artikkelen] (2011). Experimentally faking the violation of Bell’s inequalities. Physical Review Letters. ISSN 0031-9007. 107(170404). doi: 10.1103/PhysRevLett.107.170404. Vis sammendrag

  Entanglement witnesses such as Bell inequalities are frequently used to prove the non-classicality of a light source and its suitability for further tasks. By demonstrating Bell inequality violations using classical light in common experimental arrangements, we highlight why strict locality and efficiency conditions are not optional, particularly in security-related scenarios.

• Lydersen, Lars Vincent Van de Wiel; Jain, Nitin; Wittmann, Christoffer; Marøy, Øystein; Skaar, Johannes & Marquardt, Christoph [Vis alle 8 forfattere av denne artikkelen] (2011). Superlinear threshold detectors in quantum cryptography. Physical Review A. Atomic, Molecular, and Optical Physics (PRA). ISSN 1050-2947. 84. doi: 10.1103/PhysRevA.84.032320.
• Andresen, Marte Pernille Hatlo; Krogstad, Harald E & Skaar, Johannes (2011). Inverse scattering of two-dimensional photonic structures by layer stripping. Journal of the Optical Society of America. B, Optical physics. ISSN 0740-3224. 28(4), s. 689–696. doi: 10.1364/josab.28.000689.
• Gerhardt, Ilja; Liu, Qin; Lamas-linares, Antia; Skaar, Johannes; Kurtsiefer, Christian & Makarov, Vadim (2011). Full-field implementation of a perfect eavesdropper on a quantum cryptography system. Nature Communications. ISSN 2041-1723. 2(349). doi: 10.1038/ncomms1348. Fulltekst i vitenarkiv Vis sammendrag

  Quantum key distribution (QKD) allows two remote parties to grow a shared secret key. Its security is founded on the principles of quantum mechanics, but in reality it significantly relies on the physical implementation. Technological imperfections of QKD systems have been previously explored, but no attack on an established QKD connection has been realized so far. Here we show the first full-field implementation of a complete attack on a running QKD connection. An installed eavesdropper obtains the entire 'secret' key, while none of the parameters monitored by the legitimate parties indicate a security breach. This confirms that non-idealities in physical implementations of QKD can be fully practically exploitable, and must be given increased scrutiny if quantum cryptography is to become highly secure.

• Svendsen, Guro Kristin; Weman, Helge & Skaar, Johannes (2011). Model for reflection and transmission matrices of nanowire end facets. Journal of Applied Physics. ISSN 0021-8979. 109(10). doi: 10.1063/1.3583496.
• Lydersen, Lars Vincent Van de Wiel; Skaar, Johannes & Makarov, Vadim (2011). Tailored bright illumination attack on distributed-phase-reference protocols. Journal of Modern Optics. ISSN 0950-0340. 58(8), s. 680–685. doi: 10.1080/09500340.2011.565889.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim & Skaar, Johannes (2011). Secure gated detection scheme for quantum cryptography. Physical Review A. Atomic, Molecular, and Optical Physics (PRA). ISSN 1050-2947. 83(3). doi: 10.1103/PhysRevA.83.032306.
• Wiechers, Carlos; Lydersen, Lars Vincent Van de Wiel; Wittmann, Christoffer; Elser, Dominique; Skaar, Johannes & Marquardt, Christoph [Vis alle 8 forfattere av denne artikkelen] (2011). After-gate attack on a quantum cryptosystem. New Journal of Physics. ISSN 1367-2630. 13. doi: 10.1088/1367-2630/13/1/013043. Fulltekst i vitenarkiv
• Skaar, Johannes (2010). Fiber Bragg Gratings: Analysis and Synthesis Techniques. I Cusano, Andrea; Cutolo, Antonello & Albert, Jacques (Red.), Fiber Bragg Grating Sensors: Recent Advancements, Industrial Applications and Market Exploitation. Bentham eBooks. ISSN 978-1-60805-084-0. s. 35–52.
• Lydersen, Lars Vincent Van de Wiel; Wiechers, Carlos; Wittmann, Christoffer; Elser, Dominique; Skaar, Johannes & Makarov, Vadim (2010). Thermal blinding of gated detectors in quantum cryptography. Optics Express. ISSN 1094-4087. 18(26), s. 27938–27954. doi: 10.1364/OE.18.027938.
• Marøy, Øystein; Lydersen, Lars Vincent Van de Wiel & Skaar, Johannes (2010). Security of quantum key distribution with arbitrary individual imperfections. Physical Review A. Atomic, Molecular, and Optical Physics (PRA). ISSN 1050-2947. 82(3). doi: 10.1103/PhysRevA.82.032337.
• Skaar, Johannes (2010). Causality and its implications for passive and active media, Electromagnetic Theory (EMTS), 2010 URSI International Symposium on, Berlin, 16-19 Aug 2010. IEEE Press. ISSN 978-1-4244-5154-8. s. 29–32.
• Andresen, Marte Pernille Hatlo; Skaldebø, Aleksander Vatn; Haakestad, Magnus Willum; Krogstad, Harald E & Skaar, Johannes (2010). Effect of gain saturation in a gain compensated perfect lens. Journal of the Optical Society of America. B, Optical physics. ISSN 0740-3224. 27(8), s. 1610–1616.
• Lydersen, Lars Van De Wiel & Skaar, Johannes (2010). SECURITY OF QUANTUM KEY DISTRIBUTION WITH BIT AND BASIS DEPENDENT DETECTOR FLAWS. Quantum information & computation. ISSN 1533-7146. 10(1-2), s. 60–76.
• Lydersen, Lars Van De Wiel; Wiechers, Carlos; Wittmann, Christoffer; Elser, Dominique; Skaar, Johannes & Makarov, Vadim (2010). Hacking commercial quantum cryptography systems by tailored bright illumination. Nature Photonics. ISSN 1749-4885. 4(10), s. 686–689. doi: 10.1038/nphoton.2010.214. Vis sammendrag

  The peculiar properties of quantum mechanics allow two remote parties to communicate a private, secret key, which is protected from eavesdropping by the laws of physics. So-called quantum key distribution (QKD) implementations always rely on detectors to measure the relevant quantum property of single photons. Here we demonstrate experimentally that the detectors in two commercially available QKD systems can be fully remote-controlled using specially tailored bright illumination. This makes it possible to tracelessly acquire the full secret key; we propose an eavesdropping apparatus built from off-the-shelf components. The loophole is likely to be present in most QKD systems using avalanche photodiodes to detect single photons. We believe that our findings are crucial for strengthening the security of practical QKD, by identifying and patching technological deficiencies.

• Haakestad, Magnus Willum & Skaar, Johannes (2009). Slow and fast light in optical fibers using acoustooptic coupling between two co-propagating modes. Proceedings of SPIE, the International Society for Optical Engineering. ISSN 0277-786X. 7226. doi: 10.1117/12.807548.
• Lind-Johansen, Øyvind; Seip, Kristian & Skaar, Johannes (2009). The perfect lens on a finite bandwidth. Journal of Mathematical Physics. ISSN 0022-2488. 50(1). doi: 10.1063/1.3068751.
• Haakestad, Magnus Willum & Skaar, Johannes (2009). Slow and fast light in optical fibers using acoustooptic coupling between two co-propagating modes. Optics Express. ISSN 1094-4087. 17(1), s. 346–357.

Se alle arbeider i Cristin

• Nilsen, Fabian Skalleberg & Skaar, Johannes (2020). Østlandssendingen - er det mulig å forsyne seg selv med strøm ved hjelp av spinningsykler og tredemøller? [Radio]. NRK P1.
• Skaar, Johannes (2019). Intervju av TV2 Nyhetskanalen, kl 0710, om kvantedatamaskiner. [TV]. TV2 Nyhetskanalen.
• Jemterud, Torkild; Skaar, Johannes; Eidsvoll, David & Iqbal, Yasmin Sofia (2019). Abels tårn. [Radio]. NRK P2 .
• Risan, Lars & Skaar, Johannes (2019). SENT-kveld på Teknisk museum: Foredrag om kvantedatamaskiner.
• Skaar, Johannes (2019). Musikk og matematikk.
• Fedorov, Aleksey; Gerhardt, Ilja; Huang, Anqi; Jogenfors, Jonathan; Kurochkin, Yury & Lamas-Linares, Antia [Vis alle 11 forfattere av denne artikkelen] (2019). Comment on 'Inherent security of phase coding quantum key distribution systems against detector blinding attacks' (2018 Laser Phys. Lett. 15 095203). Laser Physics Letters. ISSN 1612-2011. 16. doi: 10.1088/1612-202X/aaf22d.
• Dirdal, Christopher Andrew; Hågenvik, Hans Olaf; Haave, Haakon Aamodt & Skaar, Johannes (2018). Higher order multipoles in metamaterial homogenization.
• Skaar, Johannes (2018). Fysikk og musikk.
• Skaar, Johannes (2018). Energi - uten en tråd.
• Skaar, Johannes (2018). Matematikk i musikk.
• Andersen, Elise Rønnevig; Bratberg, Øivind; Hellum, Mari Kjos; Hjelle, Ole Petter; Hussein, Bassam & Lie, Anne Helene Kveim [Vis alle 11 forfattere av denne artikkelen] (2017). Landets beste forelesere svarer: Slik studerer du mest effektivt. [Avis]. Aftenposten.
• Stensvold, Tore & Skaar, Johannes (2017). Norwegian Tech Awards 2017 - WÄRTSILÄ. De lader ferge med 1,2 megawatt effekt - uten fysisk kontakt med fartøyet. [Fagblad]. Teknisk ukeblad.
• Skaar, Johannes (2017). Musikkens fysikk.
• Sund, Steinar & Skaar, Johannes (2017). Snart kan du lade med klærne. [Tidsskrift]. Aftenposten Vitenskap.
• Mauren, Arnfinn & Skaar, Johannes (2017). Magisk teknologi kan bety farvel til hacking. [Fagblad]. Aftenposten Vitenskap.
• Sævik, Bjørnar Torvholm; Folven, Erik; Jahre, Magnus & Skaar, Johannes (2017). Ein æra er omm. [Internett]. nrk.no.
• Klingenberg, Mathias & Skaar, Johannes (2017). 100 milliarder bilder i sekundet fanger lys som går raskere enn seg selv. [Fagblad]. Teknisk ukeblad.
• Sande, Anniken & Skaar, Johannes (2017). Her og nå: Dagens gjest. [Radio]. NRK P1.
• Skaar, Johannes & Tollersrud, Emma (2017). Med lønnsøkning skal underviserne skinne. [Avis]. Morgenbladet.
• Opheim, Aagot & Skaar, Johannes (2017). Vil gi ære, status og høyere lønn til de beste underviserne. [Avis]. Adresseavisen.
• Skaar, Johannes (2016). Magneter, metallrør og usynlighetskapper.
• Indregard, Sigve & Skaar, Johannes (2016). Til Mars med mikrobølgeovn. [Avis]. Morgenbladet.
• Bakken, Kjersti & Skaar, Johannes (2016). Norgesglasset: "Lærer man egentlig noe av forelesninger, eller trenger studentene noe helt annet for å bli flinke?". [Radio]. NRK P1.
• Skaar, Johannes (2016). Kortforedrag om musikk og fysikk.
• Tollersrud, Emma & Skaar, Johannes (2016). «Hvis vi ikke underviser, er det lett å ta elementære ting for gitt.». [Avis]. Morgenbladet.
• Kleiven, David; Skjønsfjell, Eirik Torbjørn Bakken; Zontone, Federico; Chushkin, Yuriy; Skaar, Johannes & Breiby, Dag Werner (2016). Experimental and Numerical Studies for Improved Coherent Diffraction Phase Retrieval.
• Dirdal, Christopher Andrew; Hågenvik, Hans Olaf & Skaar, Johannes (2016). Higher order terms and origin dependence in metamaterial homogenization.
• Dirdal, Christopher Andrew; Hågenvik, Hans Olaf & Skaar, Johannes (2016). Permittivity, permeability, and the significance of the electrical quadrupole in metamaterials.
• Hågenvik, Hans Olaf; Dirdal, Christopher Andrew & Skaar, Johannes (2016). Homogenization of metamaterials: comparison and analysis.
• Skaar, Johannes (2015). Maxwells teori og Hertz' eksperiment – grunnlaget for moderne telekommunikasjon ble skapt for 150 år siden.
• Skaar, Johannes (2015). Hva er lys?
• Dirdal, Christopher Andrew & Skaar, Johannes (2015). Giving Freedom and Physical Meaning to the Effective Parameters of Metamaterials for all Frequencies.
• Hågenvik, Hans Olaf & Skaar, Johannes (2015). Laplace-Fourier analysis and instabilities of an active slab.
• Jegtvik, Karin & Skaar, Johannes (2015). Er du vinneren av påskefjellet? [Internett]. nrk.no.
• Ramsdal, Roar & Skaar, Johannes (2015). Her sendes 10 kilowatt trådløst. [Internett]. Teknisk ukeblad.
• Dirdal, Christopher Andrew & Skaar, Johannes (2014). Superposing Lorentzian functions towards engineering target responses. The 5th International Conference on Metamaterials, Photonic Crystals and Plasmonics Book of Abstracts.
• Dirdal, Christopher Andrew & Skaar, Johannes (2014). Superposing Lorentzian functions towards engineering target responses.
• Dirdal, Christopher Andrew & Skaar, Johannes (2014). Metamaterial responses beyond the Kramers-Kronig relations.
• Børringbo, Klaus & Skaar, Johannes (2014). Trådløs strøm – snart er den her. [Avis]. Aftenposten.
• Dalløkken, Per Erlien; Skaar, Johannes & Samset, Bjørn Hallvard (2014). «Metamaterialer» skal beskytte piloter mot laserangrep fra bakken. [Internett]. Teknisk ukeblad.
• Svendsen, Guro Kristin; Skaar, Johannes; Weman, Helge & Dupertuis, M.-A. (2014). Symmetries and optical transitions of hexagonal quantum dots in GaAs/AlGaAs nanowires.
• Iversen, Marita Løvmo; Jansrud, Line & Skaar, Johannes (2014). Går det an å gjøre noe usynlig? NRK Newton. [TV]. NRK 1.
• Schirber, Michael; Bugge, Audun Nystad; Sauge, Sebastien; Ghazali, Aina; Skaar, Johannes & Lydersen, Lars Vincent Van de Wiel [Vis alle 7 forfattere av denne artikkelen] (2014). Synopsis: Cyberattack by Breaking and Entering. [Internett]. APS Physics.
• Andreassen, Katrine; Skaar, Johannes; Løland, Anders & Rolén, Tage (2014). Finn ut om du er en sinke på ski. [Internett]. klikk.no.
• Brandslet, Steinar; Skaar, Johannes; Løland, Anders & Rolén, Tage (2014). Hvor fort går du på ski? Aftenposten (morgenutg. : trykt utg.). ISSN 0804-3116.
• Lydersen, Lars Vincent Van de Wiel & Skaar, Johannes (2013). Kvantekryptografi. Fra Fysikkens Verden. ISSN 0015-9247. 75(1).
• Skaar, Johannes; Løland, Anders; Rolén, Tage & Kokkegård, Hanne (2013). Vild med tal? Tæl dig frem til, om du er hurtigst. [Internett]. dr.dk.
• Flæten, Sigurd Øygarden & Skaar, Johannes (2013). Laser kan bli fremtidens spionkamera. [Internett]. Teknisk ukeblad.
• Brandslet, Steinar; Skaar, Johannes; Løland, Anders & Rolén, Tage (2013). Hvor fort går du på ski? [Internett]. forsking.no.
• Brandslet, Steinar; Skaar, Johannes; Løland, Anders & Rolén, Tage (2013). Hvor fort går du på ski? Gemini. ISSN 0802-085X. s. 6–7.
• Moe, Enok & Skaar, Johannes (2013). Rockheim forstyrrer flytrafikken på Værnes. Adresseavisen. ISSN 0805-3804.
• Haugen, Vegard & Skaar, Johannes (2013). Døde av elektrosjokk med iPhone 5 i hånden. VG : Verdens gang. ISSN 0805-5203.
• Haugen, Vegard & Skaar, Johannes (2013). Døde av elektrosjokk med iPhone 5 i hånden. [Internett]. amobil.no.
• Grepstad, Jon Olav; Kaspar, Peter; Johansen, Ib-Rune; Skaar, Johannes; Sudbø, Aasmund & Solgaard, Olav (2012). Optical detection of single biomolecules using photonic-crystal membranes.
• Time, Jon Kåre & Skaar, Johannes (2012). Trollmannen fra Tyrifjord. [Avis]. Morgenbladet.
• Time, Jon Kåre & Skaar, Johannes (2012). I bakvendtland der alt går an. [Avis]. Morgenbladet.
• Bugge, Audun Nystad; Sauge, Sebastien; Ghazali, Aina; Skaar, Johannes; Lydersen, Lars Vincent Van de Wiel & Makarov, Vadim (2012). Laser damage of photodiodes helps the eavesdropper.
• Miller, Johanna; Makarov, Vadim; Kurtsiefer, Christian; Liu, Qin & Skaar, Johannes (2011). "Faked states" mimic quantum entanglement. [Internett]. Physics Today. Vis sammendrag

  Also in print edition: Physics Today Vol. 64, Issue 12, pages 20-23.

• Voss, David; Makarov, Vadim; Kurtsiefer, Christian; Liu, Qin & Skaar, Johannes (2011). Synopsis: Eve Fools Alice and Bob. [Internett]. Physics.
• Merali, Zeeya; Makarov, Vadim; Liu, Qin & Skaar, Johannes (2011). Lasers illuminate quantum security loophole. [Internett]. Nature News.
• Zyga, Lisa; Makarov, Vadim; Liu, Qin & Skaar, Johannes (2011). Fake violations of Bell tests reinforce importance of closing loopholes. [Internett]. PhysOrg.com.
• Lee, Chris; Makarov, Vadim; Liu, Qin & Skaar, Johannes (2011). Researchers show how to break quantum cryptography by faking quantum entanglement. [Internett]. Ars Technica.
• Makarov, Vadim; Liu, Qin; Skaar, Johannes & Goodin, Dan (2011). Uncrackable quantum crypto undermined by new attack. [Internett]. The Register.
• Scharf, Rainer; Makarov, Vadim; Liu, Qin & Skaar, Johannes (2011). Quantenkryptographie: Bell-Ungleichung ausgetrickst. [Internett]. pro-physik.de.
• Makarov, Vadim; Skaar, Johannes; Lydersen, Lars Vincent Van de Wiel; Knight, Helen & Liu, Qin (2011). Quantum hackers: Cracking the uncrackable code. [Internett]. New Scientist. Vis sammendrag

  Also in print edition of the magazine: vol. 2835, pages 44-47 (2011)

• Grepstad, Jon Olav; Kaspar, Peter; Due-Hansen, Jon; Johansen, Ib-Rune; Borch, Morten & Furuberg, Liv [Vis alle 9 forfattere av denne artikkelen] (2011). System for optical characterization of photonic crystal membranes - designed for biological sensing with single molecule sensitivity.
• Grepstad, Jon Olav; Due-Hansen, Jon; Johansen, Ib-Rune; Borch, Morten; Kaspar, Peter & Furuberg, Liv [Vis alle 9 forfattere av denne artikkelen] (2011). Umiddelbar diagnose i 2020.
• Grepstad, Jon Olav & Skaar, Johannes (2011). Does evanescent gain exist?
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim & Skaar, Johannes (2011). Comment on "Resilience of gated avalanche photodiodes against bright illumination attacks in quantum cryptography" [Appl. Phys. Lett. 98, 231104 (2011)]. Applied Physics Letters. ISSN 0003-6951. 99(19). doi: 10.1063/1.3658806.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim & Skaar, Johannes (2011). SNSPD's in quantum cryptography.
• Lydersen, Lars Vincent Van de Wiel; Skaar, Johannes; Makarov, Vadim & Liu, Qin (2011). Quantum cryptography and quantum hacking.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Eavesdropper demonstrates loophole in secure communications. [Internett]. Photonics Spectra.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Skaar, Johannes & Marøy, Øystein (2011). Superlinear threshold detectors in quantum cryptography.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Liu, Qin & Skaar, Johannes (2011). Å knekke den uknekkelige koden.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Liu, Qin & Skaar, Johannes (2011). Eavesdropping on quantum cryptography using tailored bright light.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim & Skaar, Johannes (2011). Superconducting single photon detectors in quantum cryptography.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Skaar, Johannes & Liu, Qin (2011). Hacking quantum cryptography.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Лазерная атака. [Internett]. Лента.Ру.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Взломана действующая система квантовой криптографии. [Internett]. Компьюлента.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Kryptografia kwantowa jest nie do złamania? [Internett]. Gazeta.pl.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Hackers pioneros rompen criptosistema cuántico. [Internett]. ALT1040.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Gjør kvantekryptografi enda sikrere. [Internett]. digi.no.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Scientists crack quantum cryptography. [Internett]. Computing.co.uk.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Quantum crypto felled by 'Perfect Eavesdropper' exploit. [Internett]. The Register.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). First Exploit On Quantum Cryptography Confirmed. [Internett]. Slashdot.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Eavesdropper Steals Quantum Crypto Keys. [Internett]. InformationWeek.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Tricking the perfect code machine. [Internett]. BBC.
• Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Hackers steal quantum code. [Internett]. Physics World.
• Giæver, Ole Peder; Liu, Qin; Makarov, Vadim & Skaar, Johannes (2011). Norske forskere knekte koden. [Internett]. ABC nyheter.
• Liu, Qin; Gerhardt, Ilja; Makarov, Vadim; Skaar, Johannes; Lamas-linares, Antia & Scarani, Valerio [Vis alle 7 forfattere av denne artikkelen] (2011). Implementation of an attack scheme on a practical QKD system.
• Makarov, Vadim; Lydersen, Lars Vincent Van de Wiel; Liu, Qin; Skaar, Johannes; Gerhardt, Ilja & Wiechers, Carlos [Vis alle 10 forfattere av denne artikkelen] (2011). Cracking commercial quantum cryptography.
• Christensen, Arnfinn & Skaar, Johannes (2011). Strøm uten støpsel. [Internett]. forskning.no.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim & Skaar, Johannes (2011). Hack Me If You Can. [Avis]. Optics & Photonics Focus.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Skaar, Johannes & Marøy, Øystein (2011). Bright illumination attacks on QKD.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Skaar, Johannes & Marøy, Øystein (2011). Bright illumination attacks: distributed-phase-reference protocols and countermeasures.
• Makarov, Vadim; Lydersen, Lars Vincent Van de Wiel; Liu, Qin & Skaar, Johannes (2011). Cracking commercial quantum cryptography.
• Makarov, Vadim; Lydersen, Lars Vincent Van de Wiel; Liu, Qin & Skaar, Johannes (2011). Cracking commercial quantum cryptography.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Skaar, Johannes & Marøy, Øystein (2011). Weak after-gate attack and proposed secure gated detection scheme.
• Jemterud, Torkild & Skaar, Johannes (2011). Verdt å vite: Usynlighetskapper. [Radio]. NRK P2.
• Grepstad, Jon Olav; Johansen, Ib-Rune; Borch, Morten; Furuberg, Liv; Skaar, Johannes & Sudbø, Aasmund Sveinung [Vis alle 7 forfattere av denne artikkelen] (2010). Photonic crystal based biosensing platform for single molecule detection.
• Makarov, Vadim; Lydersen, Lars Vincent Van de Wiel & Skaar, Johannes (2010). 挪威发现“无痕截获”量子通信的方法. [Internett]. 新华网.
• Lydersen, Lars Vincent Van de Wiel; Wiechers, Carlos; Wittmann, Christoffer; Elser, Dominique; Skaar, Johannes & Makarov, Vadim (2010). Hacking commercial quantum cryptography systems by tailored bright illumination.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim & Skaar, Johannes (2010). Eavesdropping using bright light.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Liu, Qin; Marøy, Øystein & Skaar, Johannes (2010). QKD and Quantum Hacking.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Liu, Qin & Skaar, Johannes (2010). Quantum Cryptography and Quantum Hacking.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Liu, Qin & Skaar, Johannes (2010). Kvantekryptografi og kvantehacking.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Liu, Qin & Skaar, Johannes (2010). Breaking the Unbreakable Quantum Key Distribution.
• Lydersen, Lars Vincent Van de Wiel; Wiechers, Carlos; Wittmann, Christoffer; Elser, Dominique; Skaar, Johannes & Makarov, Vadim (2010). Avoiding the blinding attack in QKD reply. Nature Photonics. ISSN 1749-4885. 4(12), s. 801–801. doi: 10.1038/nphoton.2010.278.
• Jemterud, Torkild & Skaar, Johannes (2010). Verdt å vite: Illusjoner vha metamaterialer. [Radio]. NRK P2.
• Makarov, Vadim; Lydersen, Lars Vincent Van de Wiel; Liu, Qin & Skaar, Johannes (2010). How we cracked commercial quantum cryptography systems.
• Lee, Chris; Lydersen, Lars Vincent Van de Wiel; Wiechers, Carlos; Wittmann, Christoffer; Elser, Dominique & Skaar, Johannes [Vis alle 7 forfattere av denne artikkelen] (2010). Quantum cryptography is secure... except when it's not. [Internett]. Ars Technica.
• Fjelldal, Stian; Skaar, Johannes; Makarov, Vadim; Lydersen, Lars Vincent Van de Wiel & Liu, Qin (2010). Hacker på statens regning. [Avis]. VG.
• Makarov, Vadim; Lydersen, Lars Vincent Van de Wiel; Liu, Qin & Skaar, Johannes (2010). How we cracked commercial quantum cryptography systems.
• Wiechers, Carlos; Lydersen, Lars Vincent Van de Wiel; Jain, Nitin; Wittmann, Christoffer; Elser, Dominique & Makarov, Vadim [Vis alle 10 forfattere av denne artikkelen] (2010). Improving quantum key distribution systems by quantum hacking tests.
• Lydersen, Lars Vincent Van de Wiel; Wiechers, Carlos; Wittmann, Christoffer; Elser, Dominique; Skaar, Johannes & Makarov, Vadim (2010). Cracking commercial quantum cryptography.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Hackers blind quantum cryptographers. [Internett]. nature.com/news.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Hackers Eavesdrop On Quantum Crypto With Lasers. [Internett]. slashdot.org.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Hardware Hack Busts Quantum Encryption. [Internett]. International Business Times.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Quantum Hacking cracks quantum crypto. [Internett]. TechRepublic.com.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Quantum key distribution in superposition of "insecure" and "unneeded". [Internett]. ars technica.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Quantum Hackers Use Lasers to Crack Powerful Encryption Without Leaving a Trace. [Internett]. Popsci.com.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Successful Attack Against a Quantum Cryptography System. [Internett]. schneier.com.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Scientists uncover quantum encryption system weakness. [Internett]. PC pro.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Quantum key security 'blinded' by new attack. [Internett]. techworld.com.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Hardware hackers defeat quantum crypto. [Internett]. The Register.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Researchers Find Quantum Encryption Hack. [Internett]. eweek.com.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Quantum crypto detectors cracked by researchers. [Internett]. ZDNet UK.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Quantum crypto products cracked by researchers. [Internett]. Government Computer News.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Quantum Cryptography Breached With Lasers. [Internett]. Information Week.
• Skaar, Johannes; Makarov, Vadim; Lydersen, Lars Vincent Van de Wiel & Liu, Qin (2010). Schrödinger's cat and mouse. [Internett]. The Economist.
• Skaar, Johannes; Makarov, Vadim; Lydersen, Lars Vincent Van de Wiel & Liu, Qin (2010). Lager hackemat av kryptering. [Internett]. forskning.no.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). NTNU-forskere knekte superkryptering. [Internett]. Teknisk Ukeblad (tu.no).
• Skaar, Johannes; Makarov, Vadim; Lydersen, Lars Vincent Van de Wiel & Liu, Qin (2010). Lager hackemat av kryptering. [Avis]. Gemini.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Knekte superkryptering. [Internett]. Elektronikknett.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). NTNU-forskere klarte å knekke superkryptering. [Internett]. Universitetsavisa.no.
• Skaar, Johannes; Makarov, Vadim & Lydersen, Lars Vincent Van de Wiel (2010). Knekte «hackersikker» kryptering. [Internett]. adressa.no.
• Makarov, Vadim; Lydersen, Lars Van De Wiel; Liu, Qin; Wiechers, Carlos; Wittmann, Christoffer & Elser, Dominique [Vis alle 11 forfattere av denne artikkelen] (2010). Perfect eavesdropping: 100% key, 0% QBER.
• Makarov, Vadim; Lydersen, Lars Van De Wiel; Liu, Qin; Wiechers, Carlos; Wittmann, Christoffer & Elser, Dominique [Vis alle 11 forfattere av denne artikkelen] (2010). Perfect eavesdropping: 100% key, 0% QBER.
• Lydersen, Lars Vincent Van de Wiel; Makarov, Vadim; Liu, Qin & Skaar, Johannes (2010). Breaking the Unbreakable Quantum Key Distribution.
• Lydersen, Lars Vincent Van de Wiel; Skaar, Johannes; Makarov, Vadim; Marøy, Øystein & Liu, Qin (2010). Quantum key distribution and quantum hacking.
• Lydersen, Lars Vincent Van de Wiel; Skaar, Johannes; Makarov, Vadim & Liu, Qin (2010). Breaking the Unbreakable Quantum Key Distribution.
• Lydersen, Lars Vincent Van de Wiel; Skaar, Johannes; Makarov, Vadim & Liu, Qin (2010). Practical quantum hacking.
• Skaar, Johannes (2010). Causality and its implications for passive and active media.
• Makarov, Vadim; Liu, Qin; Lydersen, Lars Van De Wiel; Marøy, Øystein & Skaar, Johannes (2010). Hacking quantum cryptography.
• Svendsen, Guro Kristin; Weman, Helge & Skaar, Johannes (2010). Modelling of reflection properties of nanowire lasers.
• Simonsen, Eivind Sjøtun; Makarov, Vadim; Lydersen, Lars Van De Wiel & Skaar, Johannes (2010). Quantum key distribution system.
• Skaar, Johannes (2009). Slik fungerer "usynlighetsmaterialet". [Avis]. vg.no.
• Skaar, Johannes (2009). Quantum key distribution and quantum hacking.
• Hågenvik, Hans Olaf & Skaar, Johannes (2019). Analysis of active and passive metamaterials. NTNU Grafisk senter. ISSN 978-82-326-3915-1.
• Skaar, Johannes (2011). Elektromagnetisme. Tapir Akademisk Forlag.
• Lydersen, Lars Vincent Van de Wiel; Skaar, Johannes & Makarov, Vadim (2011). Practical security of quantum cryptography. Tapir Akademisk Forlag. ISSN 978-82-471-3012-4.
• Skaar, Johannes (2010). Musikkens fysikk. Institutt for elektronikk og telekommunikasjon, NTNU.
• Skaar, Johannes (2010). Vektoranalyse - TFE4120 Elektromagnetisme. Institutt for elektronikk og telekommunikasjon, NTNU.
• Skaar, Johannes (2010). TFE4120 Elektromagnetisme: Maxwells likninger. Institutt for elektronikk og telekommunikasjon, NTNU.

Se alle arbeider i Cristin