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 present a novel encoding scheme in a ghost-imaging system using orbital angular momentum.In the signal arm,object spatial information is encoded as a phase matrix.For an N−grey-scale object,different phase matrices...We present a novel encoding scheme in a ghost-imaging system using orbital angular momentum.In the signal arm,object spatial information is encoded as a phase matrix.For an N−grey-scale object,different phase matrices,varying from 0 toπwith incrementπ/N,are used for different greyscales,and then they are modulated to a signal beam by a spatial light modulator.According to the conservation of the orbital angular momentum in the ghost imaging system,these changes will give different coincidence rates in measurement,and hence the object information can be extracted in the idler arm.By simulations and experiments,the results show that our scheme can improve the resolution of the image effectively.Compared with another encoding method using orbital angular momentum,our scheme has a better performance for both characters and the image object.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Supported by the University Natural Science Research Foundation of Jiangsu Province(11KJA510002)the Foundation(No NJ210002)the Open Research Fund of Key Lab of Broadband Wireless Communication and Sensor Network Technology(Ministry of Education).
文摘We present a novel encoding scheme in a ghost-imaging system using orbital angular momentum.In the signal arm,object spatial information is encoded as a phase matrix.For an N−grey-scale object,different phase matrices,varying from 0 toπwith incrementπ/N,are used for different greyscales,and then they are modulated to a signal beam by a spatial light modulator.According to the conservation of the orbital angular momentum in the ghost imaging system,these changes will give different coincidence rates in measurement,and hence the object information can be extracted in the idler arm.By simulations and experiments,the results show that our scheme can improve the resolution of the image effectively.Compared with another encoding method using orbital angular momentum,our scheme has a better performance for both characters and the image object.
