Journals

Loss-tolerant concatenated Bell-state measurement with encoded coherent-state qubits for long-range quantum communication
Authors
Seok-Hyung Lee, Seung-Woo Lee, and Hyunseok Jeong
Journal
Phys. Rev. Res.
Vol
3
Page
042305
Year
2021
We show that the performance is comparable to those of other up-to-date methods and even exceeds them in some cases. Finally, we present methods to prepare logical qubits under modified parity encoding, and we implement elementary logical operations, which consist of several physical-level ingredients such as generation of superpositions of coherent states (SCSs) and elementary gates under the coherent-state basis. We then estimate the effects of imperfect physical-level elements on the performance of the scheme. Our work demonstrates that the encoded coherent-state qubits in free-propagating fields provide an alternative route to fault-tolerant information processing, especially to long-range quantum communication.