Fiber-optical communication system using polarization-encoding photons

• Autor(es): Almeida, Álvaro J. ; Silva, Nuno A. ; Muga, Nelson J. ; Pinto, Armando N.
• Data: 2010
• Identificador Persistente: http://hdl.handle.net/10773/6283
• Origem: RIA - Repositório Institucional da Universidade de Aveiro
• Tipo de Documento: Documento de conferência
• Idioma: Inglês

Descrição

We present a single-photon source based on the stimulated four-wave mixing process with adjustable linear state of polarization. This source allowed us to generate non-orthogonal states of polarization, that can be used for quantum key distribution experiments. The average number of photon counts as a function of the angle of the analyzer was obtained for two non-orthogonal linear states of polarization. The results show an accurate detection after propagation through a standard single-mode optical fiber with a length equal to 20 km. We also employed a master/slave configuration between two avalanche photodiodes, in order to check the probability of our single-photon source to emit pulses with more than one photon, for an average number of photons per pulse, μ ∼ 0.2, and consequently the probability of a photon to choose one of the paths. Results show that our experimental scheme is suitable for polarization-encoding experiments. QuantTel - Quantum Secure Telecommunications QuantPrivTel - Quantum Private Telecommunications - PTDC/EEATEL/ 103402/2008