Optics Express

Differential-phase-shift quantum key distribution experiment using fast physical random bit generator with chaotic semiconductor lasers

Toshimori Honjo, Atsushi Uchida, Kazuya Amano, Kunihito Hirano, Hiroyuki Someya, Haruka Okumura, Kazuyuki Yoshimura, Peter Davis, 康弘都倉

Published May 14, 2009• 45 citations

Publisher

Abstract

A high speed physical random bit generator is applied for the first time to a gigahertz clocked quantum key distribution system. Random phase-modulation in a differential-phase-shift quantum key distribution (DPS-QKD) system is performed using a 1-Gbps random bit signal which is generated by a physical random bit generator with chaotic semiconductor lasers. Stable operation is demonstrated for over one hour, and sifted keys are successfully generated at a rate of 9.0 kbps with a quantum bit error rate of 3.2% after 25-km fiber transmission.

DOI: 10.1364/oe.17.009053

Related papers

Fast physical random bit generator based on chaotic semiconductor lasers: Application to quantum cryptography

Atsushi Uchida, Toshimori Honjo, Kazuya Amano +7 more

We report on the application of a fast physical random bit generator based on chaotic semiconductor lasers to generation of random pulse sequences at 1.0 Gpps (giga pulses per second) in a quantum key distribution system. We generate a random binary signal at 1.0 Gbps and use it to modulate the phase of optical pulses transmitted in the differential-phase-shift quantum-key-distribution (DPS-QKD) scheme.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)Jun 1, 20092 citations

Differential Phase Shift Quantum Key Distribution Using 1.3-µm Up-Conversion Detectors

Hiroki Takesue, Toshimori Honjo, Hidehiko Kamada

We report a differential phase shift quantum key distribution (DPS-QKD) experiment in the 1.3-µm band that uses single photon detectors based on a frequency up-conversion technique. By combining a fast-clock DPS-QKD and up-conversion detectors operated in a non-gated mode, we have achieved a sifted key rate of 180 kbit/s over 10 km of fiber, which is one order of magnitude larger than a previously reported 1.3-µm band result.

Japanese Journal of Applied PhysicsJul 1, 200610 citations

Gigahertz clocked quantum key distribution system using FPGA

Toshimori Honjo

An implementation of 1-GHz clocked differential-phase-shift quantum key distribution system is reported. High speed signal generation and its storage were realized by using FPGA. A stable operation was demonstrated for over a 1-hour

European Conference on Optical CommunicationOct 16, 20090 citations

An efficient modeling and simulation of differential phase shift-quantum key distribution (DPS-QKD) system using optisystem

Mu'azu Dauda

Differential phase-shift (DPS) quantum key distribution (QKD) is a unique QKD protocol that is different from traditional ones, featuring simplicity and practicality. In this work, we simulated the DPS-QKD experiment conducted by (Liu et al., 2013), using OptiSystem 7. To the best of our knowledge, this is the first simulation work on DPS-QKD using a single photon source.We used a random number generator to get the phase modulation pattern of N=5, 7,9,11 and 13, while for the 3 and 15 pulse cases, the pattern adopted in the experiment was used. When the number of pulse (N) was 3, a quantum bit error rate (QBER) of 3.0%, which is lower than the minimum QBER of 4.12% required for unconditional security, was obtained. The key creation efficiency increases with the increase in the number of pulse up to 15, as it reaches 93.4% but at the expense of the increment in QBER. The result of our simulation is, on some aspect, in agreement with the experimental result. However, we were able to extend the transmission distance from 3 meter, as in the experiment, to 10 meter. The coincidence count obtained was also in total agreement with the one obtained from the experiment. The result of the average QBER indicated that increase in the pulse number N causes the QBER to raise up due to longer rise and fall time of phase modulation step which affect the MZ inference. Therefore, we suggest using a faster waveform generator with shorter rise and fall times will remarkably lower the QBER. Extending the transmission coverage to a longer distance while, at the same time reducing the QBER with full unconditional security will part of the future research.

Jan 1, 20170 citations

A Differential Phase Shift Key Distribution QKD System Combing with Efficient BB84 Scheme

Songhao Liu

A novel phase modulated quantum key distribution scheme with high security,which is combined differential phase shift quantum key distribution (DPS-QKD) with efficient BB84 scheme,is proposed.Alice chooses phase in {0,π/2,π,3π/2} randomly to modulate the phase of signal pulses and Bob do it in {0,π/2}.The system is designed to demonstrate its feasibility,which features perfect stability with a QBER less than 5% during 85-km fiber transmission.

ACTA PHOTONICA SINICAJan 1, 20080 citations

Differential-phase quantum key distribution experiment using a series of quantum entangled photon pairs

Toshimori Honjo, Hiroki Takesue, Kyo Inoue

We report what we believe to be the first differential-phase quantum key distribution experiment using a series of quantum entangled photon pairs. We employed two outstanding techniques. As an entangled photon source, we used a 1.5 microm band entangled photon pair source based on spontaneous four-wave mixing in a cooled dispersion-shifted fiber. As receivers, photon pairs were actively phase modulated with LiNbO3 phase modulators followed by very stable planar light-wave circuit Mach-Zehnder interferometers, which provided two nonorthogonal measurements. As a consequence, we successfully generated sifted keys with a quantum bit error rate of 8.3% and a key generation rate of 0.3 bit/s and revealed the feasibility of this QKD scheme.

Optics LettersApr 3, 200711 citations