Quantum capacities of transducers

Wang, Chiao-Hsuan; Li, Fangxin; Jiang, Liang

doi:10.1038/s41467-022-34373-8

Quantum capacities of transducers

Journal Article · Sat Nov 05 00:00:00 EDT 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-022-34373-8· OSTI ID:1897245

^[1]; Li, Fangxin ^[2]; ^[2]

National Taiwan Univ., Taipei (Taiwan); National Center for Theoretical Sciences (NCTS), Taipei (Taiwan); Univ. of Chicago, IL (United States)
Univ. of Chicago, IL (United States)

High-performance quantum transducers, which faithfully convert quantum information between disparate physical carriers, are essential in quantum science and technology. Different figures of merit, including efficiency, bandwidth, and added noise, are typically used to characterize the transducers’ ability to transfer quantum information. Here we utilize quantum capacity, the highest achievable qubit communication rate through a channel, to define a single metric that unifies various criteria of a desirable transducer. Using the continuous-time quantum capacities of bosonic pure-loss channels as benchmarks, we investigate the optimal designs of generic quantum transduction schemes implemented by transmitting external signals through a coupled bosonic chain. With physical constraints on the maximal coupling rate g_max, the highest continuous-time quantum capacity Q^max ≈ 31.4g_max is achieved by transducers with a maximally flat conversion frequency response, analogous to Butterworth electric filters. We further investigate the effect of thermal noise on the performance of transducers.

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Research Organization:: National Quantum Information Science (QIS) Research Centers (United States). Next Generation Quantum Science and Engineering (Q-NEXT)

Sponsoring Organization:: USDOE; US Army Research Office (ARO); US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF); David and Lucile Packard Foundation

Grant/Contract Number:: AC02-06CH11357; W911NF-18-1-0020; W911NF-18-1-0212; W911NF-16-1-0349; W911NF-21-1-0325; FA9550-19-1-0399; FA9550-21-1-0209; FA8649-21-P-0781; OMA-1936118; EEC-1941583; OMA-2137642; 2020-71479; Q-NEXT

OSTI ID:: 1897245

Alternate ID(s):: OSTI ID: 2423791

Journal Information:: Nature Communications, Vol. 13, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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