Universal Gate Set for Multi-Mode Schrödinger Cat States Stabilized by Non-Local Dissipation Engineering
Schrödinger cat states provide a hardware-efficient platform for bosonic quantum error correction by encoding logical information in protected manifolds of harmonic oscillators. While previous work has demonstrated the dissipative stabilization of multi-mode Schrödinger cat states as robust quantum memories, a framework for universal quantum computation has remained unavailable. Here we extend this approach by introducing a universal gate set for dissipatively stabilized multi-mode cat qubits. Using a chain of Kerr non-linear oscillators coupled through engineered non-local dissipation and an effective low-dimensional description, we show how single-qubit control can be achieved through arbitrary rotation around the X-axis and 𝝅/2-rotation around the Z-axis. We further show how coupling two such stabilized arrays through just one oscillator on each respective array enables coherent entangling operations through implementation of the XX (𝝅/2) gate. Numerical simulations demonstrate high-fidelity gate dynamics and entanglement generation under realistic parameters. Finally, we analyze the effects of induced and intrinsic photon loss, disorder, and the validity regime of the effective low-dimensional theory. Our results establish dissipatively stabilized multi-mode Schrödinger cat states as a potential architecture for universal bosonic quantum computation.
This talk will be based on the preprint available at: https://arxiv.org/abs/2607.13975
About the qGAP seminar series
This term, qGap will consist of journal-club style talks discussing interesting papers in quantum science and technology.
We aim to have a biweekly research seminar, with various people presenting research results, or discussing papers in a journal club style.
Ideally, everyone would have read the weekly reading before coming to the seminar, as they will be structured as a discussion rather than a lecture. We particularly encourage Master's students to come.
The seminars are at 14.15 in the CCSE seminar room (4th floor Physics building, East Wing), as per usual
If you have something you would like to present (whether own research or a journal-club style talk), please do not hesitate to get in touch!
A Zoom link for the seminar is available from:
Contact: Gunnar Lange - Postdoctoral Fellow, University of Oslo