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Bidirectional Mapping between a Biphoton Polarization State and a Single-Photon Two-Qubit State
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作者 林青 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第12期11-14,共4页
How to manipulate (operate or measure) single photons efficiently and simply is the basic problem in optical quantum information processing. We first present an efficient scheme to transform a biphoton polarization ... How to manipulate (operate or measure) single photons efficiently and simply is the basic problem in optical quantum information processing. We first present an efficient scheme to transform a biphoton polarization state to a corresponding single-photon state encoded by its polarization and spatial modes. This single-photon state carries both the information of the controlled and target photons. It will make the realization of bipartite positive- operator-valued measurements efficiently and simply. Moreover, the inverse transformation from the single-photon state back to the corresponding biphoton polarization state is also proposed. Using both the transformations, the realization of the arbitrary two-qubit unitary operation is simple with an M-Z interferometer. All the schemes are feasible with the current experimental technology. 展开更多
关键词 Computational physics optics quantum optics and lasers quantum information and quantum mechanics
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Optical polarization imaging for underwater target detection with non-scatter background 被引量:7
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作者 GUAN Jin-ge ZHAO Yong +3 位作者 ZHENG Yong-qiu MA Miao SUN Peng XUE Chen-yang 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2020年第4期335-342,共8页
For conventional optical polarization imaging of underwater target,the polarization degree of backscatter should be pre-measured by averaging the pixel intensities in the no target region of the polarization images,an... For conventional optical polarization imaging of underwater target,the polarization degree of backscatter should be pre-measured by averaging the pixel intensities in the no target region of the polarization images,and the polarization property of the target is assumed to be completely depolarized.When the scattering background is unseen in the field of view or the target is polarized,conventional method is helpless in detecting the target.An improvement is to use lots of co-polarization and cross polarization detection components.We propose a polarization subtraction method to estimate depolarization property of the scattering noise and target signal.And experiment in a quartz cuvette container is performed to demonstrate the effectiveness of the proposed method.The results show that the proposed method can work without scattering background reference,and further recover the target along with smooth surface for polarization preserving response.This study promotes the development of optical polarization imaging systems in underwater environments. 展开更多
关键词 polarization imaging underwater optical scattering optical information processing target detection
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Quantum information processing with nitrogen–vacancy centers in diamond 被引量:2
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作者 刘刚钦 潘新宇 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第2期114-126,共13页
Nitrogen-vacancy (NV) center in diamond is one of the most promising candidates to implement room temperature quantum computing. In this review, we briefly discuss the working principles and recent experimental prog... Nitrogen-vacancy (NV) center in diamond is one of the most promising candidates to implement room temperature quantum computing. In this review, we briefly discuss the working principles and recent experimental progresses of this spin qubit. These results focus on understanding and prolonging center spin coherence, steering and probing spin states with dedicated quantum control techniques, and exploiting the quantum nature of these multi-spin systems, such as superposition and entanglement, to demonstrate the superiority of quantum information processing. Those techniques also stimulate the fast development of NV-based quantum sensing, which is an interdisciplinary field with great potential applications. 展开更多
关键词 nitrogen-vacancy center quantum information processing spin coherence quantum gate
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Planar ion chip design for scalable quantum information processing 被引量:1
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作者 万金银 王育竹 刘亮 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第10期3565-3573,共9页
We investigate a planar ion chip design with a two-dimensional array of linear ion traps for scalable quantum information processing. Qubits are formed from the internal electronic states of trapped ^40Ca^+ ions. The... We investigate a planar ion chip design with a two-dimensional array of linear ion traps for scalable quantum information processing. Qubits are formed from the internal electronic states of trapped ^40Ca^+ ions. The segmented electrodes reside in a single plane on a substrate and a grounded metal plate separately, a combination of appropriate rf and DC potentials is applied to them for stable ion confinement. Every two adjacent electrodes can generate a linear ion trap in and between the electrodes above the chip at a distance dependent on the geometrical scale and other considerations. The potential distributions are calculated by using a static electric field qualitatively. This architecture provides a conceptually simple avenue to achieving the microfabrication and large-scale quantum computation based on the arrays of trapped ions. 展开更多
关键词 ion traps ion chip quantum information processing
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Generation and dynamic manipulation of frequency degenerate polarization entangled Bell states by a silicon quantum photonic circuit 被引量:1
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作者 Dong-Ning Liu Jing-Yuan Zheng +5 位作者 Ling-Jie Yu Xue Feng Fang Liu Kai-Yu Cui Yi-Dong Huang Wei Zhang 《Chip》 2022年第1期1-7,共7页
A silicon quantum photonic circuit was proposed and realized for the generation and the dynamic manipulation of telecom-band frequency-degenerate polarization entangled Bell states.Frequency degenerate biphoton states... A silicon quantum photonic circuit was proposed and realized for the generation and the dynamic manipulation of telecom-band frequency-degenerate polarization entangled Bell states.Frequency degenerate biphoton states were generated in four silicon waveguides by spontaneous four wave mixing.They were transformed to polar-ization entangled Bell states through on-chip quantum interference and quantum superposition,and then coupled to optical fibers.The property of polarization entanglement in generated photon pairs was demonstrated by two-photon interference under two non-orthogonal polarization bases.The output state could be dynamically switched between two Bell states,which was demonstrated by the simplified Bell state measurement.The experiment results indicated that the manipulation speed supported a modulation rate of several tens kHz,showing its potential on applications of quantum communication and quantum information processing requiring Bell state encoding and dynamic control. 展开更多
关键词 quantum information processing Silicon quantum photonic circuits Spontaneous four wave mixing quantum interference Bell states
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Guest Editorial Special Section on Quantum Information Processing
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作者 Hai-Zhi Song 《Journal of Electronic Science and Technology》 CAS CSCD 2019年第3期193-194,共2页
Quantum information processing is an active cross-disciplinary field drawing upon theoretical and experimental physics, computer science, engineering, mathematics, and material science. Its scope ranges from fundament... Quantum information processing is an active cross-disciplinary field drawing upon theoretical and experimental physics, computer science, engineering, mathematics, and material science. Its scope ranges from fundamental issues in quantum physics to prospective commercial exploitation by the computing and communications industries. 展开更多
关键词 GUEST EDITORIAL SPECIAL SECTION quantum information processing
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Degenerate polarization entangled photon source based on a single Ti-diffusion lithium niobate waveguide in a polarization Sagnac interferometer
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作者 孙宇 孙昌伟 +5 位作者 周唯 杨然 端家晨 龚彦晓 徐平 祝世宁 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第8期69-73,共5页
Combining a Ti-diffusion periodically poled lithium niobate(PPLN)waveguide with a Sagnac interferometer,two opposite directions type-II spontaneous parametric down conversions(SPDC)occur coherently and yield a high br... Combining a Ti-diffusion periodically poled lithium niobate(PPLN)waveguide with a Sagnac interferometer,two opposite directions type-II spontaneous parametric down conversions(SPDC)occur coherently and yield a high brightness,high stability polarization entanglement source.The source produces degenerate photon pairs at 1540.4 nm with a brightness of B=(1.36±0.03)×10^(6) pairs/(s·nm·m W).We perform quantum state tomography to reconstruct the density matrix of the output state and obtain a fidelity of F=0.983±0.001.The high brightness and phase stability of our waveguide source enable a wide range of quantum information experiments operating at a low pump power as well as hold the advantage in mass production which can promote the practical applications of quantum technologies. 展开更多
关键词 polarization entanglement source Sagnac interferometer quantum information lithium niobate waveguide
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Cryptanalysis and Improvement of Quantum Secret Sharing Protocol between Multiparty and Multiparty with Single Photons and Unitary Transformations 被引量:1
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作者 林崧 温巧燕 刘晓芬 《Chinese Physics Letters》 SCIE CAS CSCD 2009年第12期35-38,共4页
In a recent paper [Yan F L et al. Chin.Phys.Lett. 25(2008)1187], a quantum secret sharing the protocol between multiparty and multiparty with single photons and unitary transformations was presented. We analyze the ... In a recent paper [Yan F L et al. Chin.Phys.Lett. 25(2008)1187], a quantum secret sharing the protocol between multiparty and multiparty with single photons and unitary transformations was presented. We analyze the security of the protocol and find that a dishonest participant can eavesdrop the key by using a special attack. Finally, we give a description of this strategy and put forward an improved version of this protocol which can stand against this kind of attack. 展开更多
关键词 Computational physics Electronics and devices optics quantum optics and lasers quantum information and quantum mechanics
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Calculation of Valence Subband Structures for Strained Quantum-Wells by Plane Wave Expansion Method Within 6×6 Luttinger-Kohn Model
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作者 国伟华 黄永箴 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2002年第6期577-581,共5页
The valence subband energies and wave functions of a tensile strained quantum well are calculated by the plane wave expansion method within the 6×6 Luttinger Kohn model.The effect of the number and period of pla... The valence subband energies and wave functions of a tensile strained quantum well are calculated by the plane wave expansion method within the 6×6 Luttinger Kohn model.The effect of the number and period of plane waves used for expansion on the stability of energy eigenvalues is examined.For practical calculation,it should choose the period large sufficiently to ensure the envelope functions vanish at the boundary and the number of plane waves large enough to ensure the energy eigenvalues keep unchanged within a prescribed range. 展开更多
关键词 semiconductor optical amplifier strained quantum well plane wave expansion method polarization
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Quantum Computation with Nonlinear Optics
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作者 LIU Yang ZHANG Wen-Hong +1 位作者 ZHANG Cun-Lin LONG Gui-Lu 《Communications in Theoretical Physics》 SCIE CAS CSCD 2008年第1期107-110,共4页
We propose a scheme of quantum computation with nonlinear quantum optics. Polarization states of photons are used for qubits. Photons with different frequencies represent different qubits. Single qubit rotation operat... We propose a scheme of quantum computation with nonlinear quantum optics. Polarization states of photons are used for qubits. Photons with different frequencies represent different qubits. Single qubit rotation operation is implemented through optical elements like the Faraday polarization rotator. Photons are separated into different optical paths, or merged into a single optical path using dichromatic mirrors. The controlled-NOT gate between two qubits is implemented by the proper combination of parametric up and down conversions. This scheme has the following features: (1) No auxiliary qubits are required in the controlled-NOT gate operation; (2) No measurement is required in the course of the computation; (3) It is resource efficient and conceptually simple. 展开更多
关键词 quantum computation nonlinear optics parametric up(down)-conversion polarization modulator
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Experimental validation of dynamic polarization compensation in ground-satellite quantum key distribution 被引量:6
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作者 WANG ChaoZe GUO Hui +3 位作者 REN JiGang CAO Yuan PENG ChengZhi LIU WeiYue 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2014年第7期1233-1237,共5页
Ground-satellite quantum key distribution(QKD)is a feasible way to implement global-scale quantum communication.Herein we propose an approach to dynamically compensate the polarization of the photons when passing thro... Ground-satellite quantum key distribution(QKD)is a feasible way to implement global-scale quantum communication.Herein we propose an approach to dynamically compensate the polarization of the photons when passing through the optical telescope used in ground-satellite QKD.Our results experimentally demonstrate that the fidelity of any polarization state after dynamic compensation can be achieved by more than 99.5%,which fulfills the requirements of ground-satellite QKD. 展开更多
关键词 satellite-ground quantum key distribution polarization-encoding polarization maintaining optical system
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Error-detected single-photon quantum routing using a quantum dot and a double-sided microcavity system 被引量:1
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作者 A-Peng Liu Liu-Yong Cheng +3 位作者 Qi Guo Shi-Lei Su Hong-Fu Wang Shou Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第2期111-116,共6页
Based on a hybrid system consisting of a quantum dot coupled with a double-sided micropillar cavity, we investigate the implementation of an error-detected photonic quantum routing controlled by the other photon. The ... Based on a hybrid system consisting of a quantum dot coupled with a double-sided micropillar cavity, we investigate the implementation of an error-detected photonic quantum routing controlled by the other photon. The computational errors from unexpected experimental imperfections are heralded by single photon detections, resulting in a unit fidelity for the present scheme, so that this scheme is intrinsically robust. We discuss the performance of the scheme with currently achievable experimental parameters. Our results show that the present scheme is efficient. Furthermore, our scheme could provide a promising building block for quantum networks and distributed quantum information processing in the future. 展开更多
关键词 quantum ROUTING error-detected quantum computation quantum information processing
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Quantum process discrimination with information from environment 被引量:1
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作者 王元美 李军刚 +1 位作者 邹健 徐宝明 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第12期159-167,共9页
In quantum metrology we usually extract information from the reduced probe system but ignore the information lost inevitably into the environment. However, K. Mφlmer [Phys. Rev. Lett. 114, 040401 (2015)] showed tha... In quantum metrology we usually extract information from the reduced probe system but ignore the information lost inevitably into the environment. However, K. Mφlmer [Phys. Rev. Lett. 114, 040401 (2015)] showed that the information lost into the environment has an important effect on improving the successful probability of quantum process discrimination. Here we reconsider the model of a driven atom coupled to an environment and distinguish which of two candidate Hamiltonians governs the dynamics of the whole system. We mainly discuss two measurement methods, one of which obtains only the information from the reduced atom state and the other obtains the information from both the atom and its environment. Interestingly, for the two methods the optimal initial states of the atom, used to improve the successful probability of the process discrimination, are different. By comparing the two methods we find that the partial information from the environment is very useful for the discriminations. 展开更多
关键词 quantum process discrimination information in the environment OVERLAP
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Fast achievement of quantum state transfer and distributed quantum entanglement by dressed states 被引量:1
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作者 Liang Tian Li-Li Sun +5 位作者 Xiao-Yu Zhu Xue-Ke Song Lei-Lei Yan Er-Jun Liang Shi-Lei Su Mang Feng 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第5期107-118,共12页
We propose schemes to realize quantum state transfer and prepare quantum entanglement in coupled cavity and cavity-fiber-cavity systems,respectively,by using the dressed state method.We first give the expression of pu... We propose schemes to realize quantum state transfer and prepare quantum entanglement in coupled cavity and cavity-fiber-cavity systems,respectively,by using the dressed state method.We first give the expression of pulses shape by using dressed states and then find a group of Gaussian pulses that are easy to realize in experiment to replace the ideal pulses by curve fitting.We also study the influence of some parameters fluctuation,atomic spontaneous emission,and photon leakage on fidelity.The results show that our schemes have good robustness.Because the atoms are trapped in different cavities,it is easy to perform different operations on different atoms.The proposed schemes have the potential applications in dressed states for distributed quantum information processing tasks. 展开更多
关键词 quantum state transfer dressed state method distributed quantum information processing
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IN SITU IMAGING OF BREAST CANCER CELLS USING GREEN SEMICONDUCTOR QUANTUM DOTS 被引量:1
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作者 许恒毅 Zoraida P. Aguilar +5 位作者 苏怀朋 Benjamin J. Jones John. D. Dixon 熊勇华 魏华 Andrew Y. Wang 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 2010年第1期13-20,共8页
The breast cancer is the most common cause of cancer death in women. To establish an early stage in situ imaging of breast cancer cells, green quantum dots (QDs) are used as a fluorescent signal generator. The QDs b... The breast cancer is the most common cause of cancer death in women. To establish an early stage in situ imaging of breast cancer cells, green quantum dots (QDs) are used as a fluorescent signal generator. The QDs based imaging of breast cancer cells involves anti-HER2/neu antibody for labeling the over expressed HER2 on the surface of breast cancer cells. The complete assay involves breast cancer cells, biotin labeled antibody and streptavidin conjugated QDs. The breast cancer cells are grown in culture plates and exposed to the biotin labeled antibodies, and then exposed to streptavidin labeled QDs to utilize the strong and stable biotin-streptavidin interaction. Fluorescent images of the complete assay for breast cancer cells are evaluated on a microscope with a UV light source. Results show that the breast cancer cells in the complete assay are used as fluorescent cells with brighter signals compared with those labeled by the organic dye using similar parameters and the same number of cells. 展开更多
关键词 in situ processing quantum optics breast cancer cells non-specific binding immuno-histochemical imaging
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Towards quantum-enhanced precision measurements:Promise and challenges
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作者 张利剑 肖敏 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第11期46-51,共6页
Quantum metrology holds the promise of improving the measurement precision beyond the limit of classical ap- proaches. To achieve such enhancement in performance requires the development of quantum estimation theories... Quantum metrology holds the promise of improving the measurement precision beyond the limit of classical ap- proaches. To achieve such enhancement in performance requires the development of quantum estimation theories as well as novel experimental techniques. In this article, we provide a brief review of some recent results in the field of quantum metrology. We emphasize that the unambiguous demonstration of the quantum-enhanced precision needs a careful analysis of the resources involved. In particular, the implementation of quantum metrology in practice requires us to take into ac- count the experimental imperfections included, for example, particle loss and dephasing noise. For a detailed introduction to the experimental demonstrations of quantum metrology, we refer the reader to another article 'Quantum metrology' in the same issue. 展开更多
关键词 quantum metrology quantum information processing
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Quantum information procession with fermions based on charge detection
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作者 唐莉 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第12期5155-5160,共6页
This paper proposes a fermionic linear optical scheme for the teleportation and entanglement concentration via entanglement swapping based on charge detection. It also proves that this method is useful in generating e... This paper proposes a fermionic linear optical scheme for the teleportation and entanglement concentration via entanglement swapping based on charge detection. It also proves that this method is useful in generating entangled states such as GHZ states, W states, and cluster states by using fermionic polarizing beam splitters and single spin rotations assisted by a parity check on the fermionic qubits. This scheme is nearly deterministic (i.e., with 100% successful probability) and does not need the joint Bell state measurement required in the previous schemes. 展开更多
关键词 quantum information processing charge detection
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Anisotropy Effects on Polar Optical Vibrations in a Freestanding Wurtzite Cylindrical Quantum Dot
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作者 ZHANG Li 《Communications in Theoretical Physics》 SCIE CAS CSCD 2007年第3X期571-576,共6页
The properties of polar optical phonon vibrations in a quasi-zero- dimensional (QOD) anisotropic wurtzite cylindrical quantum dot (QD) are analyzed based on the dielectric continuum model and Loudon's uniaxial cr... The properties of polar optical phonon vibrations in a quasi-zero- dimensional (QOD) anisotropic wurtzite cylindrical quantum dot (QD) are analyzed based on the dielectric continuum model and Loudon's uniaxial crystal model. The analytical electrostatic potentials of the phonon vibrations in the systems are deduced and solved exactly. The result shows that there exist four types of polar mixing optical phonon modes in the QOD wurtzite cylindrical QD systems. The dispersive equations and electron-phonon coupling function for the quasi-confined-half-space (QC-HS) mixing modes are derived and discussed. It is found that once the radius or the height of the QD approach infinity, the dispersive equations of the QC-HS mixing modes in the QOD cylindrical QD can naturally reduce to those of the QC and HS modes in Q2D QWs or Q1D QWWs systems. This has been analyzed reasonably from both of physicM and mathematical viewpoints. 展开更多
关键词 polar optical vibration cylindrical quantum dots wurtzite heterostructure
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Quantum storage of single photons with unknown arrival time and pulse shapes
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作者 Yu You Gong-Wei Lin +2 位作者 Ling-Juan Feng Yue-Ping Niu Shang-Qing Gong 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第8期388-391,共4页
We present a scheme for the quantum storage of single photons using electromagnetically induced transparency(EIT)in a low-finesse optical cavity,assisted by state-selected spontaneous atomic emission.Mediated by the d... We present a scheme for the quantum storage of single photons using electromagnetically induced transparency(EIT)in a low-finesse optical cavity,assisted by state-selected spontaneous atomic emission.Mediated by the dark mode of cavity EIT,the destructive quantum interference between the cavity input-output channel and state-selected atomic spontaneous emission leads to strong absorption of single photons with unknown arrival time and pulse shapes.We discuss the application of this phenomenon to photon counting using stored light. 展开更多
关键词 quantum information and processing quantum electrodynamics
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Quality of correlation in quantum information
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作者 崔景云 曾天海 娄乐生 《Journal of Beijing Institute of Technology》 EI CAS 2016年第1期115-119,共5页
A strong and stable correlation in quantum information is of high quality for quantum information processing.We define two quantities,selective average correlation and ripple coefficient,to evaluate the quality of cor... A strong and stable correlation in quantum information is of high quality for quantum information processing.We define two quantities,selective average correlation and ripple coefficient,to evaluate the quality of correlation in quantum information in a time interval.As a new communication channel,Heisenberg spin chains are widely investigated.We select a two-qubit Heisenberg XXZs pin chain with Dzyaloshinskii-Moriya interaction in an inhomogeneous magnetic field as an example,and use the two quantities to evaluate the qualities of the correlation in quantum information with different measures.The result shows that,if the time evolutions are similar,there needs only evaluating one of them to know when the correlation has high quality for quantum information processing. 展开更多
关键词 correlation in quantum information quantum information processing selective average correlation ripple coefficient
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