| Presentation | 2013-07-25 Passive compensation for polarization fluctuations of a light source in QKD system Takeshi ASAI, Toshio HASEGAWA, Toyohiro TSURUMARU, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Quantum key distribution (QKD) provides unconditionally secure communications ensured by quantum mechanics. A key generation rate depends upon a quantum bit error rate (QBER), and drops to zero for QBER>5%, that is, key distribution cannot be achieved. The QBER consists of two parts. The first part is due to the performance of the single photon detector. The second part depends upon the visibility of the interferometers. In this paper, we focused on the improving the visibility. The polarization drift in the link fiber decreases the visibility. In order to increase the visibility, an active polarization-compensation with monitoring and feedback control of light pulse is often adopted. However, in QKD, a passive compensation is a solution because it is impossible to monitoring photon with feedback for remaining the polarization state. As this method, a polarization-independent technique for interferometer on the sending side is well-known. Although it works well for polarization drifts in the transmission link, it cannot compensation for those in the photon source. In this paper we proposed the method to overcome this problem, and demonstrated its stable polarization independent operation with higher visibility. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | quantum cryptography / quantum key distribution / optical source / polarization / interferometer / visibility |
| Paper # | OCS2013-21 |
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| Conference Information | |
| Committee | OCS |
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| Conference Date | 2013/7/18(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Optical Communication Systems (OCS) |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Passive compensation for polarization fluctuations of a light source in QKD system |
| Sub Title (in English) | |
| Keyword(1) | quantum cryptography |
| Keyword(2) | quantum key distribution |
| Keyword(3) | optical source |
| Keyword(4) | polarization |
| Keyword(5) | interferometer |
| Keyword(6) | visibility |
| 1st Author's Name | Takeshi ASAI |
| 1st Author's Affiliation | Mitsubishi Electric Corporation, Information Technology R&D Center() |
| 2nd Author's Name | Toshio HASEGAWA |
| 2nd Author's Affiliation | Mitsubishi Electric Corporation, Information Technology R&D Center |
| 3rd Author's Name | Toyohiro TSURUMARU |
| 3rd Author's Affiliation | Mitsubishi Electric Corporation, Information Technology R&D Center |
| Date | 2013-07-25 |
| Paper # | OCS2013-21 |
| Volume (vol) | vol.113 |
| Number (no) | 156 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |