Phase-engineered bosonic quantum codes

TitlePhase-engineered bosonic quantum codes
Publication TypeJournal Article
Year of Publication2021
AuthorsLi, L, Young, DJ, Albert, VV, Noh, K, Zou, C-L, Jiang, L
JournalPhysical Review A
Date Published6/29/2021

Continuous-variable systems protected by bosonic quantum codes have emerged as a promising platform for quantum information. To date, the design of code words has centered on optimizing the state occupation in the relevant basis to generate the distance needed for error correction. Here, we show tuning the phase degree of freedom in the design of code words can affect, and potentially enhance, the protection against Markovian errors that involve excitation exchange with the environment. As illustrations, we first consider phase engineering bosonic codes with uniform spacing in the Fock basis that correct excitation loss with a Kerr unitary and show that these modified codes feature destructive interference between error code words and, with an adapted “two-level” recovery, the error protection is significantly enhanced. We then study protection against energy decay with the presence of mode nonlinearities …