CUED Publications database

Modulator-Free Coherent-One-Way Quantum Key Distribution

Roberts, GL and Lucamarini, M and Dynes, JF and Savory, SJ and Yuan, ZL and Shields, AJ (2017) Modulator-Free Coherent-One-Way Quantum Key Distribution. Laser and Photonics Reviews, 11. p. 1700067. ISSN 1863-8880

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© 2017 The Authors. Laser & Photonics Reviews published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Time-bin encoding is an attractive method for transmitting photonic qubits over long distances with minimal decoherence. It allows a simple receiver for quantum key distribution (QKD) that extracts a key by measuring time of arrival of photons and detects eavesdropping by measuring interference of pulses in different time bins. In the past, coherent pulses have been generated using a CW laser and an intensity modulator. A greatly simplified transmitter is proposed and demonstrated here that works by directly modulating the laser diode. Coherence between pulses is maintained by a weak seed laser. The modulator-free source creates time-bin encoded pulses with a high extinction ratio (29.4 dB) and an interference visibility above 97 %. The resulting QKD transmitter gives estimated secure key rates up to 4.57 Mbit/s, the highest yet reported for coherent-one-way QKD, and can be programmed for all protocols using weak coherent pulses.

Item Type: Article
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:20
Last Modified: 21 Jun 2018 02:21