Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection
Continuous-variable quantum key distribution (CV-QKD) protocols based on coherent detection have been studied extensively in both theory and experiment. In all the existing implementations of CV-QKD, both the quantum signal and the local oscillator (LO) are generated from the same laser and propagat...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2015-10-01
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| Series: | Physical Review X |
| Online Access: | http://doi.org/10.1103/PhysRevX.5.041009 |
| _version_ | 1818399684019879936 |
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| author | Bing Qi Pavel Lougovski Raphael Pooser Warren Grice Miljko Bobrek |
| author_facet | Bing Qi Pavel Lougovski Raphael Pooser Warren Grice Miljko Bobrek |
| author_sort | Bing Qi |
| collection | DOAJ |
| description | Continuous-variable quantum key distribution (CV-QKD) protocols based on coherent detection have been studied extensively in both theory and experiment. In all the existing implementations of CV-QKD, both the quantum signal and the local oscillator (LO) are generated from the same laser and propagate through the insecure quantum channel. This arrangement may open security loopholes and limit the potential applications of CV-QKD. In this paper, we propose and demonstrate a pilot-aided feedforward data recovery scheme that enables reliable coherent detection using a “locally” generated LO. Using two independent commercial laser sources and a spool of 25-km optical fiber, we construct a coherent communication system. The variance of the phase noise introduced by the proposed scheme is measured to be 0.04 (rad^{2}), which is small enough to enable secure key distribution. This technology also opens the door for other quantum communication protocols, such as the recently proposed measurement-device-independent CV-QKD, where independent light sources are employed by different users. |
| first_indexed | 2024-12-14T07:24:35Z |
| format | Article |
| id | doaj.art-d1758274879c465b9949fc8bd37e345c |
| institution | Directory Open Access Journal |
| issn | 2160-3308 |
| language | English |
| last_indexed | 2024-12-14T07:24:35Z |
| publishDate | 2015-10-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review X |
| spelling | doaj.art-d1758274879c465b9949fc8bd37e345c2022-12-21T23:11:32ZengAmerican Physical SocietyPhysical Review X2160-33082015-10-015404100910.1103/PhysRevX.5.041009Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent DetectionBing QiPavel LougovskiRaphael PooserWarren GriceMiljko BobrekContinuous-variable quantum key distribution (CV-QKD) protocols based on coherent detection have been studied extensively in both theory and experiment. In all the existing implementations of CV-QKD, both the quantum signal and the local oscillator (LO) are generated from the same laser and propagate through the insecure quantum channel. This arrangement may open security loopholes and limit the potential applications of CV-QKD. In this paper, we propose and demonstrate a pilot-aided feedforward data recovery scheme that enables reliable coherent detection using a “locally” generated LO. Using two independent commercial laser sources and a spool of 25-km optical fiber, we construct a coherent communication system. The variance of the phase noise introduced by the proposed scheme is measured to be 0.04 (rad^{2}), which is small enough to enable secure key distribution. This technology also opens the door for other quantum communication protocols, such as the recently proposed measurement-device-independent CV-QKD, where independent light sources are employed by different users.http://doi.org/10.1103/PhysRevX.5.041009 |
| spellingShingle | Bing Qi Pavel Lougovski Raphael Pooser Warren Grice Miljko Bobrek Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection Physical Review X |
| title | Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection |
| title_full | Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection |
| title_fullStr | Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection |
| title_full_unstemmed | Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection |
| title_short | Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection |
| title_sort | generating the local oscillator locally in continuous variable quantum key distribution based on coherent detection |
| url | http://doi.org/10.1103/PhysRevX.5.041009 |
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