Free-space quantum communication device with atomic filters

Details Free-space quantum communication device with atomic filters Free-space quantum communication device with atomic filters

2005-07-22

2011-10-04

Poltorak, Peter (Department: 2434)

Cryptography

Communication system using cryptography

C380S028000, C380S256000

Reexamination Certificate

active

08031873

ABSTRACT:
The present invention discloses a free-space quantum communication device with atomic filters which are used in the field of quantum cryptography. The free-space quantum communication device of the present invention includes a beam splitter (2), two λ/2 wave plates (3,10), a λ/4 wave plate (4), two polarization beam splitters (5,11), two atomic filters (6,12), two light couplers (7,13), two optical fibers (8,14) and two single-photon detectors (9,15). In the present invention, the interference filter used in the conventional quantum communication device is replaced by ultra-narrow line-width atomic filters. As the pass-band width of atomic filter is narrower than that of the interference filter in magnitude order of 3 and a light noise rejection ratio of 10−5can be obtained, error rate generated by background light noise can be reduced by magnitude order of 2-3. Further, the distance for carrying out free-space quantum communication can be increased. Moreover, the free-space quantum cryptography communication device can normally operate in a good manner under background light noise with sunlight or moonlight.

REFERENCES:
patent: 7317574 (2008-01-01), Zoller et al.
patent: 7406173 (2008-07-01), Ichimura et al.
patent: 1545228 (2004-11-01), None

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