System for secure optical transmission of binary code

Details System for secure optical transmission of binary code System for secure optical transmission of binary code

2007-09-04

2007-09-04

Chan, Jason (Department: 2613)

Optical communications

Transmitter and receiver system

Presence detection

C398S040000, C398S154000, C380S256000

Reexamination Certificate

active

10450289

ABSTRACT:
An optical binary code transmission system comprising a sender comprising: means for generating a light beam; phase-shifter means; attenuator means whereby the intensity of the lateral modes is sufficiently low for there to exist at the most only one photon in the lateral modes. The phase-shifter means of the sender impose a phase-shift that is chosen randomly to be equal either to 0 or to π/2 for a first bit value or either to π or to 3π/2 for a second bit value, and the receiver comprising means for detecting the presence of a photon in the first lateral mode and means for detecting the presence of a photon in the second lateral mode, a first bit value being detected if the presence of a photon is detected in the first lateral mode and a second bit value being detected if the presence of a photon is detected in the second lateral mode.

REFERENCES:
patent: 6272224 (2001-08-01), Mazourenko et al.
patent: 0877508 (1998-11-01), None
“Technique for optical SSB generation to overcome dispersion pendities in fibre-radio systems”, G.H. Smith, et al., Electronics Letter, 2nd Jan. 1997, vol. 33, No. 1.
Mérolla et al. “Quantum Cryptographic Device using Single-Photon Phase Modulation”, Physical Review A, vol. 60, No. 3, pp. 1899-1905, 1999.
Mérolla et al. “Single-Photon Interference in Sidebands of Phase-Modulated Light for Quantum Cryptography”, Physical Review Letters, vol. 82, No. 8, pp. 1656-1659, 1999.
Mérolla et al. “Phase-Modulation Transmission System for Quantum Cryptography”, Optics Letters, vol. 24, No. 2, p. 104-106, 1999.
Mérolla et al. “Quantum transmission of Information with the Help of Subcarrier Frequency. Application to Quantum Cryptography”, Optics and Spectroscopy, vol. 86, No. 2, pp. 145-147, 1999.

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