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Experimental Demonstration of a Detection-Time-Bin-Shift Polarization Encoding Quantum Key Distribution System

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6 Author(s)
Lijun Ma ; Adv. Network Technol. Div., Nat. Inst. of Stand. & Technol., Gaithersburg, MD ; Tiejun Chang ; Mink, Alan ; Slattery, O.
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Detection-time-bin-shift (DTBS) is a scheme that uses time division multiplexing of a single photon detector between two photon bases in a quantum key distribution (QKD) system. This scheme can simplify the structure of a QKD system, reduce its cost and overcome the security problems caused by the dead-time induced self-correlation and the unbalanced characteristics of detectors. In this paper, we introduce an improved DTBS scheme and implement it based on our previously developed conventional fiber-based QKD system using the B92 protocol. Our DTBS QKD system generates sifted keys at a rate of more than 1 Mbit/s with a quantum bit error rate (QBER) lower than 2% over 1.1 km of fiber.

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Communications Letters, IEEE  (Volume:12 ,  Issue: 6 )