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
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.
(Optical implementations of quantum information processing and transfer)
引用本文:
. [J]. 中国物理快报, 2013, 30(6): 60305-060305.
ZHAO Sheng-Mei, GONG Long-Yan, LI Yong-Qiang, YANG Hua, SHENG Yu-Bo, CHENG Wei-Wen. A Large-alphabet Quantum Key Distribution Protocol Using Orbital Angular Momentum Entanglement. Chin. Phys. Lett., 2013, 30(6): 60305-060305.
2013, Vol. 30 
