Quantum capacity and codes for the bosonic loss-dephasing channel
Abstract
Bosonic qubits encoded in continuous-variable systems provide a promising alternative to two-level qubits for quantum computation and communication. So far, photon loss has been the dominant source of errors in bosonic qubits, but the significant reduction of photon loss in recent bosonic qubit experiments suggests that dephasing errors should also be considered. However, a detailed understanding of the combined photon loss and dephasing channel is lacking. Here, we show that, unlike its constituent parts, the combined loss-dephasing channel is non-degradable, pointing towards a richer structure of this channel. We provide bounds for the capacity of the loss-dephasing channel and use numerical optimization to find optimal single-mode codes for a wide range of error rates.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 29, 2022
- Source ID
- 10.22331/q-2022-09-29-821
Entities
People
- Liang Jiang
- Peter Leviant
- Qian Xu
- Serge Rosenblum
Organizations
- Air Force Research Laboratory
- European Research Council
- National Science Foundation
- University of Chicago
- Weizmann Institute of Science