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Quantum computation with cat qubits


These are the lecture notes from the 2019 Les Houches Summer School on "Quantum Information Machines". After a brief introduction to quantum error correction and bosonic codes, we focus on the case of cat qubits stabilized by a nonlinear multi-photon driven dissipation process. We argue that such a system can be seen as a self-correcting qubit where bit-flip errors are robustly and exponentially suppressed. Next, we provide some experimental directions to engineer such a multi-photon driven dissipation process with superconducting circuits. Finally, we analyze various logical gates that can be implemented without re-introducing bit-flip errors. This set of bias-preserving gates pave the way towards a hardware-efficient and fault-tolerant quantum processor.

Dates and versions

hal-03918283 , version 1 (02-01-2023)



Jérémie Guillaud, Joachim Cohen, Mazyar Mirrahimi. Quantum computation with cat qubits. 2023. ⟨hal-03918283⟩
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