期刊
PHYSICAL REVIEW A
卷 103, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.103.052436
关键词
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资金
- Project Qdisc [US-15097]
- MINECO [FIS2017-89609-P, PCI2019-111885-2]
- FEDER funds
- project HYPERU-P-S
- QuantERA ERA-NET Cofund in Quantum Technologies
The paper discusses two DI-QKD protocols that rely on Bell inequalities with more than two inputs and two outputs. It shows that, for maximally entangled states and perfect visibility, a protocol based on a Bell inequality with three inputs and four outputs requires slightly lower detection efficiency than those based on Bell inequalities with two inputs and two outputs.
Device-independent quantum key distribution (DI-QKD) offers the strongest form of security against eavesdroppers bounded by the laws of quantum mechanics. However, a practical implementation is still pending due to the requirement of combinations of visibility and detection efficiency that are beyond those possible with current technology. This mismatch motivates the search for DI-QKD protocols that can close the gap between theoretical and practical security. In this work, we present two DI-QKD protocols whose security relies on Bell inequalities with more than two inputs and two outputs. We show that, for maximally entangled states and perfect visibility, a protocol based on a Bell inequality with three inputs and four outputs requires a slightly lower detection efficiency than the protocols based on Bell inequalities with two inputs and two outputs.
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