SINGLE PHOTON COUNTING IN THE NEAR- AND MID-INFRARED VIA FREQUENCY UP-CONVERSION APPLIED TO QUANTUM COMMUNICATIONS / CONTAGEM DE FÓTONS NO INFRAVERMELHO PRÓXIMO E MÉDIO VIA CONVERSÃO DE FREQÜÊNCIAS APLICADA A COMUNICAÇÕES QUÂNTICAS

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Two single photon counting devices, operating at near- and mid-infrared wavelengths, are introduced and experimentally investigated. Both use a twostage technique, comprised of an initial frequency up-conversion procedure inside a nonlinear crystal followed by a silicon avalanche photodiode. Whereas the first project consists on detection of single photons at 1.55 ìm for fiber-optic-based quantum communications, using a cavity-enhanced procedure, the second project envisions the development of a single-photon counter operating at 4.65 ìm for free-space systems. In this case, a feasibility study for a practical quantum key distribution system operating in a mid-infrared wavelength is performed. The results show that, using present-day technology, such a system can be constructed, albeit its usefulness would be restricted to operation under very specific weather conditions.

ASSUNTO(S)

single photon counting quantum communications optica nao-linear optica de espaco livre quantum cryptography comunicacao quantica criptografia quantica contagem de fotons nonlinear optics free-space optics

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