JP5590601B2 - 縺れ光源のタイムビン偏光フォーマット変換技術 - Google Patents
縺れ光源のタイムビン偏光フォーマット変換技術 Download PDFInfo
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- JP5590601B2 JP5590601B2 JP2010005517A JP2010005517A JP5590601B2 JP 5590601 B2 JP5590601 B2 JP 5590601B2 JP 2010005517 A JP2010005517 A JP 2010005517A JP 2010005517 A JP2010005517 A JP 2010005517A JP 5590601 B2 JP5590601 B2 JP 5590601B2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
- H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding
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- Electromagnetism (AREA)
- Theoretical Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Description
12 非対称マッハツェンダー干渉計
13 偏光・時間遅延付与装置
21 連続光光源
22 非線形光学結晶
31 分岐部
32 第1のアーム
33 第2のアーム
34 合波部
41 偏光調整器
42 第1の偏光ビームスプリッタ(PBS)
43 第2の偏光ビームスプリッタ(PBS)
44 第1のパス
45 第1の時間遅延付与装置(第2のパス)
Claims (4)
- 波長が800nm以上2000nm以下である第1の光子と,波長が500nm以上1000nm以下であって前記第1の光子より波長が短い第2の光子を発生するための光子発生源(11)と,
前記光子発生源(11)から発生した前記第1の光子がファイバを伝搬して入射し,前記第1の光子に対して時間遅延を与える非対称マッハツェンダー干渉計(12)と,
前記光子発生源(11)から発生した前記第2の光子がファイバを伝搬して入射し,前記第2の光子に対して偏光と時間遅延とを与える偏光・時間遅延付与装置(13)と,
前記偏光・時間遅延付与装置(13)を経た前記第2の光子が自由空間を伝搬して入射する受光装置と,を含み,
前記偏光・時間遅延付与装置(13)は,前記第2の光子に対し,前記非対称マッハツェンダー干渉計(12)により前記第1の光子に与えられる遅延時間と等しい時間遅延を与えて,前記第1の光子と前記第2の光子との間に量子縺れ状態を発生させると共に,前記第2の光子に対して水平偏光状態と垂直偏光状態を重畳して,|0>と|1>の量子状態を,それぞれ,水平偏光状態|H>と垂直偏光状態|V>とにフォーマット変換する
量子鍵配送システム。 - 前記受光装置は,偏光素子及び光子検出器によって構築されている
請求項1に記載の量子鍵配送システム。 - 前記非対称マッハツェンダー干渉計(12)は,
前記第1の光子が入射し,分岐する分岐部(31)と,
前記分岐部(31)で分離した一方の光が伝搬する第1のアーム(32)と,
前記分岐部(31)で分離した残りの光が伝搬するアームであって,前記第1のアーム(32)とは光路長が異なり,これにより前記第1のアーム(32)を伝搬した光に対し,時間遅延を与えた光を出力できる第2のアーム(33)と,
を有する,
請求項1に記載の量子鍵配送システム。 - 前記偏光・時間遅延付与装置(13)は,
前記第2の光子が入射する偏光調整器(41)と,
前記偏光調整器(41)からの光を偏光面に応じて分離する第1の偏光ビームスプリッタ(42)と,
前記1の偏光ビームスプリッタ(42)により偏光分離された一方の光と残りの光とが入射する第2の偏光ビームスプリッタ(43)と,
前記1の偏光ビームスプリッタ(42)により偏光分離された残りの光に,前記1の偏光ビームスプリッタ(42)により偏光分離された一方の光に対して,時間遅延を与える第1の時間遅延付与装置(45)と,
を含む,
請求項1に記載の量子鍵配送システム。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2010005517A JP5590601B2 (ja) | 2010-01-14 | 2010-01-14 | 縺れ光源のタイムビン偏光フォーマット変換技術 |
US12/979,707 US8509446B2 (en) | 2010-01-14 | 2010-12-28 | Time-bin polarization format exchange technique for entangled optical source |
Applications Claiming Priority (1)
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JP2010005517A JP5590601B2 (ja) | 2010-01-14 | 2010-01-14 | 縺れ光源のタイムビン偏光フォーマット変換技術 |
Publications (2)
Publication Number | Publication Date |
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JP2011146886A JP2011146886A (ja) | 2011-07-28 |
JP5590601B2 true JP5590601B2 (ja) | 2014-09-17 |
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JP2010005517A Expired - Fee Related JP5590601B2 (ja) | 2010-01-14 | 2010-01-14 | 縺れ光源のタイムビン偏光フォーマット変換技術 |
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US (1) | US8509446B2 (ja) |
JP (1) | JP5590601B2 (ja) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5590601B2 (ja) * | 2010-01-14 | 2014-09-17 | 独立行政法人情報通信研究機構 | 縺れ光源のタイムビン偏光フォーマット変換技術 |
US8885677B1 (en) * | 2011-09-28 | 2014-11-11 | Redfern Integrated Optics, Inc. | Semiconductor external cavity laser with integrated planar waveguide bragg grating and wide-bandwidth frequency modulation |
US20130088413A1 (en) * | 2011-10-05 | 2013-04-11 | Google Inc. | Method to Autofocus on Near-Eye Display |
US20150153572A1 (en) * | 2011-10-05 | 2015-06-04 | Google Inc. | Adjustment of Location of Superimposed Image |
US9720437B2 (en) * | 2012-05-10 | 2017-08-01 | The Mitre Corporation | Method and apparatus for quantum mechanical entanglement protection |
JP6060737B2 (ja) * | 2013-03-05 | 2017-01-18 | 沖電気工業株式会社 | 量子鍵配送用受信器 |
RU2566335C1 (ru) * | 2014-04-04 | 2015-10-20 | Общество с ограниченной ответственностью "Лаборатория оптико-электронных приборов" (ООО "ЛОЭП") | Способ генерации секретных ключей с помощью перепутанных по времени фотонных пар |
CN109962771B (zh) * | 2017-12-14 | 2024-03-12 | 科大国盾量子技术股份有限公司 | 硅基单片集成量子密钥分发接收方芯片 |
CN110011792B (zh) * | 2019-03-06 | 2021-10-26 | 暨南大学 | 基于极化码的单步量子密钥分发后处理方法、系统、介质和设备 |
GB2602353B (en) | 2020-12-24 | 2023-09-13 | Toshiba Kk | Optical system and method |
GB2605392B (en) | 2021-03-30 | 2023-12-06 | Toshiba Kk | Optical system and method |
CN113408734B (zh) * | 2021-06-30 | 2022-04-26 | 武汉理工大学 | 基于量子偏振纠缠的光加法器 |
WO2024121850A1 (en) | 2022-12-05 | 2024-06-13 | Heqa Security Ltd | Quantum key distribution free space optical communication |
Family Cites Families (11)
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US5930414A (en) * | 1997-09-16 | 1999-07-27 | Lucent Technologies Inc. | Method and apparatus for automatic compensation of first-order polarization mode dispersion (PMD) |
JP3564489B2 (ja) * | 2000-07-18 | 2004-09-08 | 独立行政法人情報通信研究機構 | 光通信システムおよび光通信方法 |
JP4462806B2 (ja) * | 2002-02-22 | 2010-05-12 | 日本電気株式会社 | 量子暗号鍵配布システム |
JP4173422B2 (ja) * | 2002-12-04 | 2008-10-29 | 日本電信電話株式会社 | 量子鍵配送方法及び量子鍵配送システム |
US20060274401A1 (en) * | 2003-04-22 | 2006-12-07 | Shuichiro Inoue | Single-photon generator |
US7536012B1 (en) * | 2003-08-06 | 2009-05-19 | The United States Of America As Represented By The Secretary Of The Army | Entangled quantum communications and quantum imaging |
US20060290941A1 (en) * | 2004-12-09 | 2006-12-28 | Wide Net Technologies | Polarization control for quantum key distribution systems |
US7254295B2 (en) * | 2005-11-21 | 2007-08-07 | Magiq Technologies, Inc. | Optical fiber interferometer with relaxed loop tolerance and QKD system using the same |
JP4935995B2 (ja) | 2007-02-22 | 2012-05-23 | 日本電気株式会社 | 量子暗号装置 |
JP5126479B2 (ja) * | 2007-04-16 | 2013-01-23 | 日本電気株式会社 | 量子鍵配布システム及び受信装置 |
JP5590601B2 (ja) * | 2010-01-14 | 2014-09-17 | 独立行政法人情報通信研究機構 | 縺れ光源のタイムビン偏光フォーマット変換技術 |
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- 2010-01-14 JP JP2010005517A patent/JP5590601B2/ja not_active Expired - Fee Related
- 2010-12-28 US US12/979,707 patent/US8509446B2/en not_active Expired - Fee Related
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US20110170695A1 (en) | 2011-07-14 |
JP2011146886A (ja) | 2011-07-28 |
US8509446B2 (en) | 2013-08-13 |
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