Abstract
Quantum key distribution with pulsed heralded single photon source was performed over 40 km of fiber for the first time to our knowledge. QBER was measured to be 4.23% suggesting security against unconditional attack.
Highlights
From its introduction 20 years ago, quantum key distribution (QKD) using the BB84 protocol [1] was soon followed by first experimental demonstration over air [2] and fiber [3], and is available commercially from various companies
In this paper we present the first demonstration of BB84 based QKD experiment using pulsed-heralding single photon source (HSPS) performed over 40 km on fiber, which exceeds achievable distance with QKD based on the original BB84 protocol with weak coherent pulse (WCP)
The multi-photon component statistics of our HSPS was measured using a Hanburry Brown and Twiss (HBT) setup consisting of a 50/50 fiber beam splitter and two single photon detectors at 1550 nm based on avalanche photodiode (APD) (Id Quantique id200)
Summary
From its introduction 20 years ago, quantum key distribution (QKD) using the BB84 protocol [1] was soon followed by first experimental demonstration over air [2] and fiber [3], and is available commercially from various companies. There have been reports about such sources [9, 10, 11] and a QKD system including one of them [12], all of them are using parametric fluorescence with CW pumping In this case, there are some problems because the signal photons are produced at random times. It is very difficult to synchronize the sender and receiver stations Such a system may not be used for future systems equipped with quantum relays [13, 14] or quantum repeaters [15], because the accuracy of timing/position of photons is indispensable for bell state analysis using two-photon interference. We report our experimental results with gain analysis for coherent attack based on the reference [17] in section 4 before conclusion
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