Practical decoy-state measurement-device-independent quantum key distribution

Abstract

Measurement-device-independent quantum key distribution (MDI-QKD) is immune to all the detection attacks; thus when it is combined with the decoy-state method, the final key is unconditionally secure, even if a practical weak coherent source is used by Alice and Bob. However, until now, the analysis of decoy-state MDI-QKD with a weak coherent source is incomplete. In this paper, we derive, with only vacuum+weak decoy state, some tight formulas to estimate the lower bound of yield and the upper bound of error rate for the fraction of signals in which both Alice and Bob send a single-photon pulse to the untrusted third party Charlie. The numerical simulations show that our method with only vacuum+weak decoy state can asymptotically approach the theoretical limit of the infinite number of decoy states. Furthermore, the statistical fluctuation due to the finite length of date is also considered based on the standard statistical analysis.

5 pages, 3 figures

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• Three-intensity decoy state method for device independent quantum key distribution
• Generalized three-intensity decoy state method for measurement device independent quantum key distribution
• Hacking on decoy-state quantum key distribution system with partial phase randomization
• Quantum coin flipping secure against channel noises
• Phase-encoded measurement device independent quantum key distribution with practical spontaneous parametric-down-conversion sources
• Trustworthiness of detectors in quantum key distribution with untrusted detectors
• Feasibility of space-based measurement-device-independent quantum key distribution
• Measurement-device-independent quantum-secret-sharing networks with linear Bell-state analysis
• Probing single-photon state tomography using phase-randomized coherent states
• Security Of Finite-Key-Length Measurement-Device-Independent Quantum Key Distribution Using Arbitrary Number Of Decoys