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Non-degenerate polarization-entangled photon pairs generation device and non-degenerate polarization-entangled photon pairs generation method

外国特許コード F110003634
整理番号 A241-75WO
掲載日 2011年6月30日
出願国 欧州特許庁(EPO)
出願番号 08871496
公報番号 2233971
公報番号 2233971
出願日 平成20年12月10日(2008.12.10)
公報発行日 平成22年9月29日(2010.9.29)
公報発行日 平成28年3月9日(2016.3.9)
国際出願番号 JP2008072441
国際公開番号 WO2009093391
国際出願日 平成20年12月10日(2008.12.10)
国際公開日 平成21年7月30日(2009.7.30)
優先権データ
  • 2008JP072441 (2008.12.10) WO
  • 特願2008-014938 (2008.1.25) JP
発明の名称 (英語) Non-degenerate polarization-entangled photon pairs generation device and non-degenerate polarization-entangled photon pairs generation method
発明の概要(英語) A non-degenerate polarization-entangled photon pair generation device (1) that efficiently and easily generates non-degenerate polarization-entangled photon pairs includes: a quantum-entangled photon pair generator (2) including a single crystal in which periodically poled structures (3a, 3b) having different periods are formed; and a light radiating unit (4) for entering light into the quantum-entangled photon pair generator (2) such that the light passes through the periodically poled structure (3a) and then through the periodically poled structure (3b).
A period of the periodically poled structure (3a) is different from a period of the periodically poled structure (3b) such that a parabola indicative of a relation between an emission angle and a wavelength of a polarized photon emitted based on light incident on the periodically poled structure (3a) comes into contact with a parabola indicative of a relation between an emission angle and a wavelength of polarized photon emitted based on light incident on the periodically poled structure (3b), within an allowable range under a phase matching condition.
特許請求の範囲(英語) [claim1]
1. A non-degenerate polarization-entangled photon pair generation device (1;1a;1c) comprising: a quantum-entangled photon pair generator (2;2b;2c) including a single crystal in which a first periodically poled structure (3a;3d) and a second periodically poled structure (3b;3e) are formed; and light radiating means (4) arranged for entering light into the single crystal such that the light passes through the first periodically poled structure (3a;3d) and then through the second periodically poled structure (3b;3e); characterized in that the first periodically poled structure (3a;3d) has a first period and the second periodically poled structure (3b;3e) has a second period that is different from the first period.
[claim2]
2. The non-degenerate polarization-entangled photon pair generation device (1;1a) as set forth in claim 1, wherein: the first period of the first periodically poled structure (3a) is different from the second period of the second periodically poled structure (3b) such that a parabola indicative of a relation between an emission angle and a wavelength of a polarized photon emitted based on light incident on the first periodically poled structure (3a) comes into contact with a parabola indicative of a relation between an emission angle and a wavelength of polarized photon emitted based on light incident on the second periodically poled structure (3b), within an allowable range under a phase matching condition.
[claim3]
3. The non-degenerate polarization-entangled photon pair generation device (1;1a;1c) as set forth in claim 1, wherein: the single crystal is a lithium niobate crystal.
[claim4]
4. The non-degenerate polarization-entangled photon pair generation device (1a) as set forth in claim 1, further comprising: a third periodically poled structure (3c) that produces pump light, the light radiating means (4) entering the light into the third periodically poled structure (3c) such that the light passes through the third periodically poled structure (3c), the first periodically poled structure (3a), and the second periodically poled structure (3b), in this order.
[claim5]
5. The non-degenerate polarization-entangled photon pair generation device (1a) as set forth in claim 4, wherein: the third periodically poled structure (3c) is formed in the single crystal.
[claim6]
6. A non-degenerate polarization-entangled photon pair generation method comprising the step of: entering light into a single crystal in which a first periodically poled structure (3a;3d) and a second periodically poled structure (3b;3e) are formed, in such a manner that the light passes through the first periodically poled structure (3a;3d) and then through the second periodically poled structure (3b;3e); characterized in that the first periodically poled structure (3a;3d) has a first period and the second periodically poled structure (3b;3e) has a second period that is different from the first period.
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • 発明者(英語)
  • EDAMATSU KEIICHI
  • SHIMIZU RYOSUKE
  • NAGANO SHIGEHIRO
国際特許分類(IPC)
欧州特許分類/主・副
  • B82Y010/00
  • G02F001/39
  • G06N099/00K
  • H04L009/08F8D
指定国 Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
参考情報 (研究プロジェクト等) CREST Creation of Nanodevices and System Based on New Physical Phenomena and Functional Principles AREA
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