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A Large-alphabet Quantum Key Distribution Protocol Using Orbital Angular Momentum Entanglement |
ZHAO Sheng-Mei1**, GONG Long-Yan1,2**, LI Yong-Qiang1, YANG Hua1, SHENG Yu-Bo1, CHENG Wei-Wen1 |
1Institute of Signal Processing and Transmission, Nanjing University of Posts and Telecommunications, Nanjing 210003
2Department of Applied Physics, Nanjing University of Posts and Telecommunications, Nanjing 210003 |
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Cite this article: |
ZHAO Sheng-Mei, GONG Long-Yan, LI Yong-Qiang et al 2013 Chin. Phys. Lett. 30 060305 |
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Abstract We experimentally demonstrate a quantum key distribution protocol using entangled photon pairs in orbital angular momentum (OAM). Here Alice uses a fixed phase hologram to modulate her OAM state on one photon with a spatial light modulator (SLM), while Bob uses the designed N different phase holograms for his N-based keys on the other photon with his SLM. With coincidences, Alice can fully retrieve the keys sent by Bob without reconciliation. We report the experiment results with N=3 and OAM eigenmodes |?=±1>, and discuss the security from the light path and typical attacks.
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Received: 25 January 2013
Published: 31 May 2013
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PACS: |
03.67.Dd
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(Quantum cryptography and communication security)
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42.50.Tx
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(Optical angular momentum and its quantum aspects)
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03.67.Hk
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(Quantum communication)
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42.50.Ex
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(Optical implementations of quantum information processing and transfer)
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