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Compressed ghost imaging based on differential speckle patterns

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Chinese Physics B 2020年第2期29卷 294-300页

作者： Le Wang shengmei zhao Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications(NUPT)Nanjing 210003China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology(NUPT) Ministry of EducationNanjing 210003China

We propose a compressed ghost imaging scheme based on differential speckle patterns,named *** the scheme,a series of bucket detector signals are acquired when a series of random speckle patterns are employed to illuminate an unknown *** the differential speckle patterns(differential bucket detector signals)are obtained by taking the difference between present random speckle patterns(present bucket detector signals)and previous random speckle patterns(previous bucket detector signals).Finally,the image of object can be obtained directly by performing the compressed sensing algorithm on the differential speckle patterns and differential bucket detector *** experimental and simulated results reveal that CGI-DSP can improve the imaging quality and reduce the number of measurements comparing with the traditional compressed ghost imaging schemes because our scheme can remove the environmental illuminations efficiently.

关键词： ghost imaging compressed sensing differential speckle patterns differential bucket detector signals

Multiple CRC-aided variable successive cancellation list decoder of polar codes

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The Journal of China Universities of Posts and Telecommunications 2017年第2期24卷 83-88页

作者： Cao Miao zhao Shuang zhao shengmei Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications

In order to change the path candidates, reduce the average list size, and make more paths pass cyclic redundancy check （CRC）, multiple CRC-aided variable successive cancellation list （SCL） decoding algorithm is proposed. In the decoding algorithm, the whole unfrozen bits are divided into several parts and each part is concatenated with a corresponding CRC code, except the last part which is concatenated with a whole unfrozen CRC code. Each CRC detection is performed, and only those satisfying each part CRC become the path candidates. A variable list is setup for each part to reduce the time complexity. Variable list size is setup for each part to reduce the time complexity until one survival path in each part can pass its corresponding CRC. The results show that the proposed algorithm can reduce the average list size, and the frame error rate （FER） performance, and has a better performance with the increase of the part number.

关键词： polar codes successive cancellation list decoder cyclic redundancy check list path variable list size

Full color ghost imaging by using both time and code division multiplexing technologies

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Chinese Physics B 2022年第11期31卷 316-323页

作者： Le Wang Hui Guo shengmei zhao Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications(NUPT)Nanjing 210003China College of Information Engineering Fuyang Normal UniversityFuyang 236037China

We propose a new full color ghost imaging scheme using both time and code division multiplexing *** the scheme,the speckle patterns of three colors(red,green and blue)are modulated with different time slots and *** light intensity is sampled by one bucket *** based on the modulated time slots and codes,we can effectively and simultaneously extract three detection component signals corresponding to three color components of objects from the sampling signal of the bucket ***,three component images resulting from the three component detection signals can be synthesized into a full color *** experimental results verify the feasibility of our scheme under the limit of the number of time slots and ***,our scheme reduces the number of bucket detectors and can realize high quality imaging even in a noisy environment.

关键词： ghost imaging time division multiplexing code division multiplexing full color imaging

Multidimensional reconciliation protocol for continuous-variable quantum key agreement with polar coding

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Science China(Physics,Mechanics & Astronomy) 2018年第9期61卷 99-102页

作者： shengmei zhao ZhiGang Shen Hong Xiao Le Wang Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education

Continuous-variable quantum key distribution（CVQKD）[1-7]allows two remote parties（Alice and Bob）to share a secret key,even in the presence of an eavesdropper（Eve）with unlimited computational power[8-17].While,a highly efficient reconciliation protocol[18-21]is crucial in a CVQKDsystem, which can not only extract the errorless secret keys, but also provide a promising way to achieve a long distance CVQKD at a low signal-to-noise ratio （SNR）.

关键词：和解协议连续变量钥匙多维编码 SNR 长距离

A QUANTUM MULTIPLE ACCESS COMMUNICATIONS SCHEME USING ORBITAL ANGULAR MOMENTUM

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Journal of Electronics(China) 2013年第2期30卷 145-151页

作者： Dong Xiaoliang zhao shengmei Zheng Baoyu Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications

We propose a quantum multiple access communications scheme using Orbital Angular Momentum (OAM) sector states in the paper. In the scheme, each user has an individual modified Poincare Bloch sphere and encodes his information with his own corresponding sector OAM states. A prepared entangled photon pairs are separated at transmitter and receiver. At the transmitter, each user encodes his information with the sector OAM states on the photons and the superposition of the different sector OAM states is carried by the photons. Then the photons are transmitted through quantum noiseless channel to the receiver. At the receiver, each user could retrieve his information by coincidently measuring the transmitted photons with the receiver side photons which are modulated by a special prepared measurement basis. The theoretical analysis and the numerical simulations show that each user could get his information from the superposition state without error. It seems that this scheme provides a novel method for quantum multiple users communications.

关键词： Quantum multiple access communications Orbital Angular Momentum (OAM) Sector state Measurement basis

Feedback Quantum Neuron and Its Application

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Feedback Quantum Neuron and Its Application

Efficient separating orbital angular momentum mode with radial varying phase

2005 International Conference on Neural Networks and Brain(ICNN&B’05)

作者： Fei Li shengmei zhao Baoyu Zheng Institute of Signal and Information Processing Nanjing University of Posts and Telecommunications

ISBN: (纸本)0780394224

＜正＞A model of feedback quantum neuron（FQN） is proposed.A novel multi-user detector based on feedback quantum neuron and quantum register is *** analysis is given to the theoretical basis and practical performance of the proposed *** simulation results show that the proposed detector has more powerful properties both in bit error rate and near-far resistance than Hopfield neural network based detector.A multi-user detector based on improved FQN is also proposed and the simulation results have shown that the improved FQN multi-user detector is obviously superior to the FQN multi-user *** performance is close to the optimum multi-user detector.

关键词： Neurofeedback Neurons Detectors Quantum computing Multiuser detection Artificial neural networks Signal processing Hopfield neural networks Information processing Electronic mail

来源： cnki会议评论

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Photonics Research 2017年第4期5卷 267-270页

作者： CHENG LI shengmei zhao Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education

It is shown that orbital angular momentum(OAM) is a promising new resource in future classical and quantum communications. However, the separation of OAM modes is still a big challenge. In this paper, we propose a simple and efficient separation method with a radial varying phase. In the method, specific radial varying phases are designed and modulated for different OAM modes. The resultant beam is focused to the spots with different horizontal and vertical positions after a convex lens, when the coordinate transformation, including two optical elements with coordinate transformation phase and correct phase, operates on the received *** horizontal position of the spot is determined by the vortex phases, and the vertical position of the spot is dependent on the radial varying phases. The simulation and experimental results show that the proposed method is feasible both for separation of two OAM modes and separation of three OAM modes. The proposed separation method is available in principle for any neighboring OAM modes because the radial varying phase is controlled. Additionally, no extra instruments are introduced, and there is no diffraction and narrowing process limitation for the separation.

关键词： OAM Efficient separating orbital angular momentum mode with radial varying phase mode

Fast reconstructed and high-quality ghost imaging with fast Walsh-Hadamard transform

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Photonics Research 2016年第6期4卷 240-244页

作者： Le Wang shengmei zhao Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications (NUPT)

In this paper, we propose a ghost imaging scheme with fast Walsh–Hadamard transform, named GIFWHT. In the scheme, Walsh–Hadamard pattern pairs are used to illuminate an object to generate pairs of detection results, and the corresponding differential detection result is used as the result as that from the conventional bucket *** performing the fast Walsh–Hadamard transform on 2~k(k is a positive integer) differential detection results,the image of the object can be recovered. The experimental and numerical simulation results show that the reconstruction time of GIFWHT is greatly reduced, and the quality of the recovered image is noticeably improved. In addition, GIFWHT is robust against interference from environmental illumination and could save memory.

关键词： WHT high

Nonorthogonal object identification based on ghost imaging

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Photonics Research 2015年第5期3卷 238-242页

作者： Xiaofan Gu shengmei zhao Institute of Signal Processing & Transmission Nanjing University of Posts and Telecommunications (NUPT) Key Lab of Broadband Wireless Communication and Sensor Network Technology NUPT Ministry of Education

Ghost imaging could be used to make a quick identification of orthogonal objects by means of photocurrent correlation measurements. In this paper, we extend the method to identify nonorthogonal objects. In the method, an object is illuminated by one photon from an entangled pair, and the other one is diffracted into a particular direction by a pre-established multiple-exposure hologram in the idler arm. By the correlation measurements, the nonorthogonal object in the signal arm could be discriminated within a very short time. The constraints for the identification of nonorthogonal objects are presented, which show that the nonorthogonal objects can be discriminated when the overlapping portion between any two objects is less than half of all the objects in the set. The numerical simulations further verify the result.

关键词： Nonorthogonal object identification based on ghost imaging