3 ms·
Autonomous Quantum Error Correction of Gottesman-Kitaev-Preskill States
- westurner 3y ago> [...] Finally, the advantages of the fully autonomous approach presented here and the measure-and-feedback approach of Ref. [17] could be combined. Indeed, by using a measurement followed by an unconditional reset of the auxiliary, one would have access to error syndromes that can be used in a second layer of quantum error correction, without requiring fast feedback and feed-forward operations within the first layer. - "Noise Fuels Quantum Leap, Boosting [spin electron] Qubit Performance by 700%" (2024) https://news.ycombinator.com/item?id=39762802 https://news.ycombinator.com/item?id=39762802 > In conclusion, we have demonstrated the preparation of GKP logical states in the mode of a superconducting cavity with state fidelities mainly limited by bit flips of the auxiliary and intrinsic dephasing of the storage mode. A quantum error correcting protocol based on reservoir engineering, in which the reset of the auxiliary serves as the dissipative process, is demonstrated. We have made the QEC protocol completely autonomous through the implementation of an unconditional auxiliary reset based on a dissipative swap to a lossy resonator. Despite the auxiliary having a relaxation time 10 times shorter than the storage mode, we demonstrate autonomous QEC of GKP states with a gain on the logical lifetime of about 24%. To guide the requirements at the second layer of error correction, further work is needed to upper bound the gain from QEC of the GKP code accessible with realistic hardware and software improvements. - "A physical qubit with built-in error correction" (2024) https://news.ycombinator.com/item?id=39243929 https://news.ycombinator.com/item?id=39243929