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US20040233935: Photonic quantum information system using unpolarised light

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Filing Information

Inventor(s) Andrew Shields · Zhiliang Yuan ·
Assignee(s) Kabushiki Kaisha Toshiba ·
Correspondent OBLON, SPIVAK, MCCLELLAND, MAIER & NEUSTADT, P.C. ·
Application Number US10786550
Filing date 02/26/2004
Publication date 11/25/2004
Predicted expiration date 02/26/2024
U.S. Classifications 370/474  · 398/FOR.108  ·
International Classifications H04J003/24  ·
Kind CodeA1
Foreign Priority GB0305157 - 03/06/2003 ·
31 Claims, 15 Drawings


Abstract

A photon emitter comprising: a photon generator configured to generate photons having a first polarisation state or a second polarisation state, the first polarisation state being orthogonal to the second polarisation state; and time delay means for delaying photons having the second polarisation state with respect to those having the first polarisation state.

Independent Claims | See all claims (31)

  1. 1. A photon emitter comprising: a photon generator configured to generate photons having a first polarisation state or a second polarisation state, the first polarisation state being orthogonal to the second polarisation state; and time delay means for delaying photons having the second polarisation state with respect to those having the first polarisation state.
  2. 14. A quantum communication system comprising: a photon emitter comprising: a photon generator configured to generate photons having a first polarisation state or a second polarisation state, the first polarisation state being orthogonal to the second polarisation state; time delay means for delaying photons having the second polarisation state with respect to those having the first polarisation state; and encoding means, wherein photons which have passed through the time delay means are passed into an encoding means, the communication system further comprising a receiver having means to decode the photons and a detector.
  3. 27. A method of outputting photons, the method comprising: providing a photon generator configured to generate photons having a first polarisation state or a second polarisation state, the first polarisation state being orthogonal to the second polarisation state; and delaying photons having the second polarisation state with respect to those having the first polarisation state.
  4. 31. A polarisation distinguisher for a photon generator configured to generate photons having a first polarisation state or a second polarisation state, the first polarisation state being orthogonal to the second polarisation state; said distinguisher comprising: time delay means for delaying photons having the second polarisation state with respect to those having the first polarisation state.

References Cited

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Patent Family

Document NumberAssigneeInventorsIssue/Pub Date
GB0305157 TOSHIBA RES EUROP LTD Apr 2003
GB2399220 TOSHIBA RES EUROP LTD YUAN ZHILIANG et al. Sep 2004
US20040233935 Kabushiki Kaisha Toshiba Andrew Shields et al. Nov 2004