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 spa...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|l=±1>,and discuss the security from the light path and typical attacks.展开更多
We study numerically the electronic properties of one-dimensional systems with long-range correlated binary potentials. The potentials are mapped from binary sequences with a power-law power spectrum over the entire f...We study numerically the electronic properties of one-dimensional systems with long-range correlated binary potentials. The potentials are mapped from binary sequences with a power-law power spectrum over the entire frequency range, which is characterized by correlation exponent β. We find the localization length ζ increases withβ. At system sizes N →∞, there are no extended states. However, there exists a transition at a threshold ζ. Whenβ 〉 βc, we obtain ζ 〉 0. On the other hand, at finite system sizes, ζ≥ N may happen at certain β, which makes the system ＂metallic＂, and the upper-bound system size N＊ （β） is given.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 61271238 and 10904074the Specialized Research Fund for the Doctoral Program of Higher Education of China under Grant No 20123223110003+3 种基金the University Natural Science Research Foundation of Jiangsu Province under Grant No 11KJA510002the Open Research Fund of National Laboratory of Solid State Microstructures under Grant Nos M25020 and M25022Qinglan Project of Jiangsu Provincethe Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘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|l=±1>,and discuss the security from the light path and typical attacks.
基金Project supported by the National Natural Science Foundation of China （Grants Nos. 10904074 and 10974097）, the National Key Basic Research Special Foundation of China （Grant No. 2009CB929501）, and the National Science Council （Grant No. 97-2112- M-032-003-MY3）.
文摘We study numerically the electronic properties of one-dimensional systems with long-range correlated binary potentials. The potentials are mapped from binary sequences with a power-law power spectrum over the entire frequency range, which is characterized by correlation exponent β. We find the localization length ζ increases withβ. At system sizes N →∞, there are no extended states. However, there exists a transition at a threshold ζ. Whenβ 〉 βc, we obtain ζ 〉 0. On the other hand, at finite system sizes, ζ≥ N may happen at certain β, which makes the system ＂metallic＂, and the upper-bound system size N＊ （β） is given.
