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Physical Review A

Quantum cryptographic device using single-photon phase modulation

Jean-Marc Mérolla, Yuri T. Mazurenko, J.-P. Goedgebuer, Laurent Duraffourg, Henri Porte, William T. Rhodes

Published Sep 1, 1999• 41 citations
Publisher

Abstract

We report a particular implementation of a quantum cryptographic device operating at 1540-nm wavelength and involving interference between phase-modulated sidebands produced by a pair of phase modulators in the transmitting and receiving modules. The principle of operation is described in terms of both classical and quantum optics. The method has been demonstrated experimentally using a strongly attenuated semiconductor laser diode. Single photon interference has been obtained with a fringe visibility greater than 90%, indicating that the system can be used for quantum key distribution.

DOI
10.1103/physreva.60.1899

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We report a particular implementation of a quantum cryptographic device operating at 1540-nm wavelength and involving interference between phase-modulated sidebands produced by a pair of phase modulators in the transmitting and receiving modules. The principle of operation is described in terms of both classical and quantum optics. The method has been demonstrated experimentally using a strongly attenuated semiconductor laser diode. Single photon interference has been obtained with a fringe visibility greater than 90%, indicating that the system can be used for quantum key distribution.
We report a particular implementation of a quantum cryptographic device operating at 1540 nm wavelength and involving interference between phase-modulated sidebands produced by a pair of phase modulators in the transmitting and receiving modules. The principle of operation is described in terms of both classical and quantum optics. The method has been demonstrated experimentally using a strong- attenuated semiconductor laser diode. Single photon interference has been obtained with a fringe visibility greater than 90%, including that the system can be used for quantum key distribution.
The article presents the experimental implementation of a method for increasing the quantum key distribution rate in free-space quantum-cryptographic communication lines by simultaneously transmitting single photons with wavelengths of 780 and 850 nm via a single quantum channel. The laboratory system we created demonstrated an approximately twofold increase in the distribution rate of the so-called ‘‘sifted’’ quantum key by using two setups operating at wavelengths of 780 and 850 nm and transmitting photons via one quantum channel 23 cm long. The distribution rate of the sifted quantum key and the quantum bit error rate for a wavelength of 780 nm was 11502±29011502\pm 29011502±290 bit/s and 2.4±0.4%2.4\pm 0.4\%2.4±0.4% , and for a wavelength of 850 nm— 10627±29010627\pm 29010627±290 bit/s and 3.9±0.5%3.9\pm 0.5\%3.9±0.5%