Optical transmission of frequency-coded quantum bits with WDM synchronization

Thiago Ferreira da Silva, Jean Pierre von der Weid

DOI: 10.14209/sbrt.2008.42879

Evento: XXVI Simpósio Brasileiro de Telecomunicações (SBrT2008)

Keywords: QKD; quantum-key distribution; cryptography; frequency coding; BB84 protocol

Abstract

Quantum-key distribution enables absolutely secure communication between two parts, making them able to share a secret that will be used in the posterior message encryption. Here we shall report the experimental implementation of an optical qubits transmission system compatible with the BB84 protocol. Photons are prepared and measured by a double-modulation process according with the relative phase of a wavelength-division multiplexed synchronized radiofrequency signal, in the way that the qubits are coded in the optical sidebands. A filtering scheme is applied to further sidebands selection, delivering the qubits to the single-photon detector.

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