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Entangled photon pair generating apparatus

Foreign code F110005480
File No. K05501US
Posted date Sep 6, 2011
Country United States of America
Application number 50277303
Gazette No. 20050094142
Gazette No. 7211812
Date of filing Jan 28, 2003
Gazette Date May 5, 2005
Gazette Date May 1, 2007
International application number JP2003000762
International publication number WO2003065117
Date of international filing Jan 28, 2003
Date of international publication Aug 7, 2003
Priority data
  • P2002-026085 (Feb 1, 2002) JP
  • 2003WO-JP00762 (Jan 28, 2003) WO
Title Entangled photon pair generating apparatus
Abstract (US7211812)
An entangled photon pair generating apparatus has a first definite polarization photon pair generating apparatus for generating a first definite polarization photon pair beam according to an incident pump beam, a wave plate for rotating by 90 degrees a plane of polarization of the first definite polarization photon pair beam emitted from the first definite polarization photon pair generating apparatus, and a second definite polarization photon pair generating apparatus for generating a second definite polarization photon pair beam according to the incident pump beam.
They are adjacently placed in order along an optical axis of the incident pump beam.
Scope of claims [claim1]
1. An entangled photon pair generating apparatus comprising: a first definite polarization photon pair generating apparatus to generate a first definite polarization photon pair beam according to an incident pump beam;
a wave plate to rotate by 90 degrees a plane of polarization of the first definite polarization photon pair beam emitted from the first definite polarization photon pair generating apparatus;
and
a second definite polarization photon pair generating apparatus to generate a second definite polarization photon pair beam according to the incident pump beam,wherein the first definite polarization photon pair generating apparatus, wave plate and second definite polarization photon pair generating apparatus are adjacently placed in the order along an optical axis of the incident pump beam.
[claim2]
2. The entangled photon pair generating apparatus according to claim 1, wherein the first and second definite polarization photon pair generating apparatuses are nonlinear optical devices.
[claim3]
3. The entangled photon pair generating apparatus according to claim 2, wherein an incident angle of the incident pump beam on the nonlinear optical devices is an angle at which the angle made by the optical axis of a crystal in the nonlinear optical device and the incident pump beam satisfies a collinear condition.
[claim4]
4. The entangled photon pair generating apparatus according to claim 2, wherein the nonlinear optical device is a BBO (beta -Ba B2 O4) crystal.
[claim5]
5. The entangled photon pair generating apparatus according to claim 1, further comprising: a lens to focus each of entangled photon pair beams;
and
an optical fiber to couple the focused beams.
[claim6]
6. The entangled photon pair generating apparatus according to claim 1, wherein the first and second definite polarization photon pair generating apparatuses further comprise: an incident pump beam generating unit;
and
a photon pair generating unit comprising the nonlinear optical device having the angle made by the optical axis of the crystal and the incident pump beam set up at the angle for a tuning curve thereof to contact with a specific single wavelength a,wherein two photon beams are generated which include a pair of photons of the wavelength a which are generated simultaneously.
[claim7]
7. The entangled photon pair generating apparatus according to claim 1, wherein the first and second definite polarization photon pair generating apparatuses further comprise: the incident pump beam generating unit;
and
the photon pair generating unit comprising the nonlinear optical device having the angle made by the optical axis of the crystal and the incident pump beam set up at the angle for the tuning curve thereof to contact with wavelengths a and b, respectively,wherein the two photon beams are generated which are include a pair of photons of the wavelengths a and b which are generated simultaneously.
[claim8]
8. The entangled photon pair generating apparatus according to claim 1, further comprising: a detecting unit for detecting one of the generated photon pair,wherein the detecting unit is able to identify generation time of each individual photon included in the beam.
[claim9]
9. The entangled photon pair generating apparatus according to claim 3, wherein the nonlinear optical device is a BBO (beta -Ba B2 O4) crystal.
[claim10]
10. The entangled photon pair generating apparatus according to claim 2, further comprising: a lens to focus each of entangled photon pair beams;
and
an optical fiber to couple the focused beams.
[claim11]
11. The entangled photon pair generating apparatus according to claim 3, further comprising: a lens to focus each of entangled photon pair beams;
and
an optical fiber to couple the focused beams.
[claim12]
12. The entangled photon pair generating apparatus according to claim 4, further comprising: a lens to focus each of entangled photon pair beams;
and
an optical fiber to couple the focused beams.
[claim13]
13. The entangled photon pair generating apparatus according to claim 2, further comprising: a detecting unit for detecting one of the generated photon pair,wherein the detecting unit is able to identify generation time of each individual photon included in the beam.
  • Inventor, and Inventor/Applicant
  • TAKEUCHI SHIGEKI
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
Reference ( R and D project ) PRESTO Light and Control AREA
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