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Proceedings Paper

Coherent photodetection with applications in quantum communications and cryptography
Author(s): F. J. Mendieta; A. Arvizu; R. Muraoka; P. Gallion; J. Sanchez
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Paper Abstract

We present an application of coherent homodyne detection to the problem of low photon number communications and cryptography. As the coherent demodulation of an optical field requires the measurement of its (non commutating) inphase and quadrature components, we present the structure and operation of an 8-port optical hybrid comprising 2 balanced homodyne detection structures, for the simultaneous measurement of the 2 quadratures. We analyze this receiver operating with a strong local oscillator field, when the received field is in weak coherent states, with digital phase modulation: we obtain the homodyne statistics and the uncertainty product in the presence of vacuum noises from the input signal port and unused ports and discuss the increase in uncertainty due to the simultaneous measurements of the quadratures. We obtain the signal to noise ratio as well of the bit error rate performance for binary phase shift keying and discuss the departure from the standard quantum limit.

Paper Details

Date Published: 3 December 2009
PDF: 6 pages
Proc. SPIE 7499, Seventh Symposium Optics in Industry, 749905 (3 December 2009); doi: 10.1117/12.848861
Show Author Affiliations
F. J. Mendieta, Ctr. de Investigación Científica y de Educación Superior de Ensenada (Mexico)
A. Arvizu, Ctr. de Investigación Científica y de Educación Superior de Ensenada (Mexico)
R. Muraoka, Ctr. de Investigación Científica y de Educación Superior de Ensenada (Mexico)
P. Gallion, Telecom Paris Tech (France)
J. Sanchez, Univ. Autónoma de Baja California (Mexico)


Published in SPIE Proceedings Vol. 7499:
Seventh Symposium Optics in Industry
Guillermo García Torales; Jorge L. Flores Núñez; Gilberto Gómez Rosas; Eric Rosas, Editor(s)

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