期刊
NEW JOURNAL OF PHYSICS
卷 16, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/16/4/043005
关键词
quantum key distribution; quantum memory; measurement device; independent; quantum repeaters; quantum networks
资金
- European Community's Seventh Framework Programme [277110]
- UK Engineering and Physical Sciences Research Council [EP/J005762/1]
- National Basic Research Program of China [2011CBA00300, 2011CBA00301]
- 1000 Youth Fellowship program in China
- NSERC Discovery Program
- DARPA Quiness Program
- Engineering and Physical Sciences Research Council [1092802, EP/J005762/1] Funding Source: researchfish
- EPSRC [EP/J005762/1] Funding Source: UKRI
A protocol with the potential of beating the existing distance records for conventional quantum key distribution (QKD) systems is proposed. It borrows ideas from quantum repeaters by using memories in the middle of the link, and that of measurement-device-independent QKD, which only requires optical source equipment at the user's end. For certain memories with short access times, our scheme allows a higher repetition rate than that of quantum repeaters with single-mode memories, thereby requiring lower coherence times. By accounting for various sources of nonideality, such as memory decoherence, dark counts, misalignment errors, and background noise, as well as timing issues with memories, we develop a mathematical framework within which we can compare QKD systems with and without memories. In particular, we show that with the state-of-the-art technology for quantum memories, it is potentially possible to devise memory-assisted QKD systems that, at certain distances of practical interest, outperform current QKD implementations.
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