Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session W34: CV Quantum Computation and Simulation II
3:00 PM–6:00 PM,
Thursday, March 17, 2022
Room: McCormick Place W-193A
Sponsoring Unit: DQI
Chair: Tian Zhong, University of Chicago
Abstract: W34.00011 : GKP code stabilization with robust ancilla error suppression
5:24 PM–5:36 PM
We propose a protocol to stabilize the GKP code in a target mode by mapping its error syndromes to an ancillary GKP mode via a quadrature-quadrature interaction. In contrast to previously proposed schemes, coupling to solely one ancilla quadrature allows tailoring the ancilla state and its preparation accordingly to ensure a strong suppression of back-propagating errors to the target mode.
The error-syndrome information is retrieved and the ancilla efficiently re-initialized using similar techniques demonstrated in the recent GKP experiments. For realistic system parameters, numerical simulations confirm the robust suppression of ancilla induced logical errors and show an enhancement of the logical qubit lifetime by an order of magnitude beyond the break-even point.
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