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Research of Ghost Imaging and Quantum Multiple Access Communication Based on Entanglement of Photon Orbital Angular Momentum

Author: DingJian
Tutor: ZhaoShengMei
School: Nanjing University of Posts and Telecommunications
Course: Signal and Information Processing
Keywords: Photon orbital angular momentum Entangled photon pairs Quantum ghost imaging Bell's inequality Quantum multiple access communication
CLC: O431.2
Type: Master's thesis
Year: 2011
Downloads: 142
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Abstract


Experiment generated entangled photon pairs divided into two , if to place objects in which one , through coincidence counting record two optical path , you can get the clear image of the object in the optical path of another branch , this imaging technique called the associated imaging (correlated imaging) or \The ghost imaging technology, with its unique delocalized imaging characteristics aroused great concern in the military , medical , astronomy , as well as search and rescue and other fields has broad application prospects . Photon orbital angular momentum entangled states based , analytically pure phase object imaging process . Conformity with the rotational angle of the two superimposed state based on two superimposed state BLOCH spherical equator is a pair of cosine function relationships , and the coding method proposed the multi gradation pure phase object associated imaging techniques , the Labview simulation platform , validation the effectiveness of the algorithm , and with the literature [ 16] compared to other coding methods . The simulation results are shown for a variety of gray object , the proposed encoding algorithm can significantly improve the image quality of the multi-gradation object . On this basis , the quantum experimental platform has been erected , from the experiments demonstrate that the proposed encoding algorithm , while the literature [ 16 ] mentioned imaging methods , and to compare the experimental results of the two methods . Ghost imaging system through multiple scans of the Bloch spherical equator calculated and normalized experimental calculated correlation coefficient , the value 2.54 when the the OAM value is 1 ; when OAM value of 2 , the value 2.32 , contrary Bell inequality (Belline quality), that imaging experiments with quantum properties of entangled light source . In addition , the paper also proposed an implementation of quantum multiple access communication method based OAM entangled photons . Mutually orthogonal quantum states between different OAM value complete , Reference CDMA concept , the symbols of the different users is mapped to the quantum state of the different OAM value , all user information is transmitted in the same signal on the optical path , between each user's measurement group, and the symbols of the other users are orthogonal , each user is able to detect their own information . The numerical simulation results demonstrate the feasibility and effectiveness of the quantum multiple access communication program Finally, experimental schematic diagram of the quantum multiple access communication .

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CLC: > Mathematical sciences and chemical > Physics > Optics > The light nature of the theory > Quantum optics
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