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Quantum Electronics and Laser Science Conference

Integrated quantum key distribution system using single sideband detection

Jean-Marc Mérolla, Alexandre Soujaeff, M. Marc, F. Patois, William T. Rhodes, J.-P. Goedgebuer

Published Jun 25, 2003• 4 citations
Publisher

Abstract

Summary form only given. We propose a new approach, based on a single side band (SSB) detection scheme, that allows the BB84 protocol to be used in a robust scheme for quantum cryptography and eliminates both polarization and path-delay maintenance problems. An unbalanced integrated Mach Zehnder modulator modulates the intensity of the reference beam.

DOI
10.1109/qels.2002.1031043

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Summary form only given. We propose a new approach, based on a single side band (SSB) detection scheme, that allows the BB84 protocol to be used in a robust scheme for quantum cryptography and eliminates both polarization and path-delay maintenance problems. An unbalanced integrated Mach Zehnder modulator modulates the intensity of the reference beam.
Quantum Cryptography enables secret distribution between remotes parties where classical communications fail. The proposed technique uses optical signal modulation to encode information with relative phase difference between frequency separated signals. The single side band detection scheme (SSB) enables efficient secret key distribution. The system security is guaranteed with a strong reference protocol. One can use a fainted laser source without security breach for any distance. A second proposed technique uses relative phase difference between time separated pulses. The single side pulse detection scheme (SSP) enables efficient secret key distribution and benefits the same security features as the SSB system. Both SSP and SSB may be multiplexed to increase the secure bit rate. The maximizing initial average energy is then one photon per pulse. The implemented SSB protocol includes an autocompensation system for the optical path fluctuations that make the system robust over long time periods.
We report a long-distance, polarization insensitive, quantum key distribution scheme using single-sideband (SSB) detection. The method uses an amplitude modulation to transmit photon in sidebands. The system acts as a fainted laser diode whose information quantum state is encoded in the phase difference between the main peak and its sidebands. Using the dispersion properties of the fiber, the relative phase between interacting quantum states can be reliably controlled by sending a reference signal over the physical link that transmits the quantum signal. Therefore, photon detection can be performed very accurately over long distances. Stability of the synchronization technique with respect to optical path variation is also discussed. The reconciliation process uses a LAN connection as public channel. Experiments were carried out in the C-band telecom window (1550 nm), over a 40-km standard single-mode fiber spool as well as over a 10-km deployed fiber.