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Incorporating element doping and quantum dot embedding effects to enhance the thermoelectric properties of higher manganese silicides

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Journal of Materiomics 2021年第2期7卷 377-387页

作者： Qing Wang Shiyu Song Xiaofeng Yang Ziyang Liu Yufei Ma Xingyuan San Jianglong Wang Dan Zhang Shu-Fang Wang Zhiliang Li Key Laboratory of High-precision Computation and Application of Quantum Field Theory of Hebei Province College of Physics Science and TechnologyHebei UniversityBaoding071002China Institute of Life Science and Green Development Hebei UniversityBaoding071002China

Element doping and nano-inclusion embedding are effective approaches to enhance the electrical conductivities and decrease the lattice thermal conductivities of thermoelectric(TE)materials,***,the intrinsic low electrical thermal conductivities and high electrical properties are severely sacrificed,and the final figure of merit(ZT)is usually *** this study,Ag doping and Pt quantum dot(QD)embedding were synchronously achieved via embedding Ag/Pt alloy QDs into the higher manganese silicides to avoid the conventional single-element doping *** power factor(at 823 K)was enhanced from 1.57×10^(-3) W m^(-1) K^(-2) to 1.82×10^(-3) W m^(-1) K^(-2)(-16%)due to the-18%increase in carrier concentration that was derived from the Ag doping ***,the lattice thermal conductivity(at 823 K)decreased from 2.65 W m^(-1) K^(-1) e1.92 W m^(-1) K^(-1)(-28%)because of the broadband phonon scattering effect that resulted from the residual Pt QDs ***,the optimal ZT value increased by-52%from 0.42 to 0.64 at 823 *** study demonstrated that incorporating metastable alloy QDs to obtain element doping and nano-inclusion embedding effects is a novel and feasible means to enhance the ZT value of *** method is also possibly applicable to other alloy QD/TE composites.

关键词： Quantum dot Inclusion Higher manganese silicide Thermoelectric material Figure of merit

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High-efficiency nondistortion quantum interrogation of atoms in quantum superpositions

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Physical Review A 2001年第2期64卷 020101(R)-020101(R)页

作者： Xingxiang Zhou,1 Zheng-Wei Zhou Guang-Can Guo Marc J. Feldman Laboratory of Quantum Communication and Quantum Computation and Department of Physics University of Science and Technology of China Hefei Anhui 230026 China Superconducting Digital Electronics Lab Electrical and Computer Engineering Department University of Rochester Rochester New York 14627

We consider the nondistortion quantum interrogation of an atom prepared in a quantum superposition. By manipulating the polarization of the probe photon and making connections to interaction-free measurements of opaque objects, we show that nondistortion interrogation of an atom in a quantum superposition can be done with efficiency approaching unity. However, if any component of the atom’s superposition is completely transparent to the probe wave function, a nondistortion interrogation of the atom is impossible.

关键词： .DONE Polarization transparent RAPID COMMUNICATIONS interferometer quantum interrogation quantum superposition probe photon opaque nondistortion interrogation atom in quantum completely probe wave function impossible

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Quantum key distribution via quantum encryption

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Physical Review A 2001年第2期64卷 024302-024302页

作者： Yong-Sheng Zhang Chuan-Feng Li Guang-Can Guo Laboratory of Quantum Communication and Quantum Computation and Department of Physics University of Science and Technology of China

A quantum key distribution protocol based on quantum encryption is presented in this Brief Report. In this protocol, the previously shared Einstein-Podolsky-Rosen pairs act as the quantum key to encode and decode the classical cryptography key. The quantum key is reusable and the eavesdropper cannot elicit any information from the particle Alice sends to Bob. The concept of quantum encryption is also discussed.

关键词： .quantum information eavesdropper quantum encryption Quantum key particle Alice sends

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Epitaxial Growth and Magnetic Properties of NiMnAs Films on GaAs Substrates

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Chinese physics Letters 2019年第1期36卷 65-69页

作者： Jia-Lin Ma Hai-Long Wang Xing-Min Zhang Shuai Yan Wen-Sheng Yan Jian-Hua Zhao State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Shanghai Synchrotron Radiation Facility Institute of Applied Physics Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences

Single-phase Ni_(0.92)Mn_(1.08) As films with strained C_(1b) symmetry are grown on GaAs(001) substrates. In addition,a preferred epitaxial configuration of(110)-orientated Ni_(0.92)Mn_(1.08) As on(001)-orientated GaAs is revealed by synchrotron radiation measurement. The magnetic properties of the films are found to be significantly influenced by the growth temperature and the optimized growth temperature is determined to be ~370℃. According to the results of x-ray absorption spectroscopy, these phenomena can be attributed to the variation of the local electronic structure of the Mn atoms. Our work provides useful information for the further investigations of NiMnAs, which is a theoretically predicted half-metal.

关键词： Epitaxial Growth Magnetic Properties GaAs Substrates

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Reducing the communication complexity with quantum entanglement

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Physical Review A 2001年第3期64卷 032304-032304页

作者： Peng Xue Yun-Feng Huang Yong-Sheng Zhang Chuan-Feng Li Guang-Can Guo Laboratory of Quantum Communication and Quantum Computation and Department of Physics University of Science and Technology of China

We propose a probabilistic two-party communication complexity scenario with a prior nonmaximally entangled state, which results in less communication than is required with only classical random correlations. A simple ... 详细信息

关键词： .EPR communication complexity scenario quantum communication complexity

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Probabilistic quantum cloning via Greenberger-Horne-Zeilinger states

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Physical Review A 2000年第4期62卷 042302-042302页

作者： Chuan-Wei Zhang Chuan-Feng Li Zi-Yang Wang Guang-Can Guo Laboratory of Quantum Communication and Quantum Computation and Department of Physics University of Science and Technology of China

We propose a probabilistic quantum cloning scheme using Greenberger-Horne-Zeilinger (GHZ) states, Bell-basis measurements, single-qubit unitary operations, and generalized measurements, all of which are within the reach of current technology. Compared to another possible scheme via Tele-controlled-NOT gate [D. Gottesman and I. L. Chuang, Nature (London) 402, 390 (1999)], the present scheme may be used in experiment to clone the states of one particle to those of two different particles with higher probability and less GHZ resources.

关键词： .clone polarization GHZ unitary operations single-qubit generalized measurements higher probability Greenberger-Horne-Zeilinger Tele-controlled-NOT different particles

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Probabilistic teleportation and entanglement matching

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Physical Review A 2000年第3期61卷 034301-034301页

作者： Wan-Li Li Chuan-Feng Li Guang-Can Guo Laboratory of Quantum Communication and Quantum Computation and Department of Physics University of Science and Technology of China

Teleportation may be interpreted as sending and extracting quantum information through quantum channels. In this report, it is shown that to get the maximal probability of exact teleportation through a partially entangled quantum channel, the sender (Alice) need only operate a measurement that satisfies an “entanglement matching” to this channel. An optimal strategy is also provided for the receiver (Bob) to extract the quantum information by adopting a general evolution.

关键词： .quantum information quantum channel general evolution exact teleportation

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Optimal entanglement purification via entanglement swapping

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Physical Review A 2000年第5期62卷 054301-054301页

作者： Bao-Sen Shi Yun-Kun Jiang Guang-Can Guo Laboratory of Quantum Communication and Quantum Computation Department of Physics University of Science and Technology of China

It is known that entanglement swapping can be used to realize entanglement purification. In this way, two particles belonging to different nonmaximally entangled pairs can be projected probabilistically to a maximally entangled state or to a less entangled state. In this paper, we show, when the less entangled state is obtained, then a maximally entangled state can be obtained probabilistically from this less entangled state if a unitary transformation is introduced locally. The probability of success of our scheme is equal to the entanglement of a single pair purification (if two original pairs are in the same nonmaximally entangled states) or to the smaller entanglement of a single pair purification of these two pairs (if two original pairs are not in the same nonmaximally entangled states). The advantage of our scheme is that no continuous indefinite iterative procedure is needed to achieve optimal purification.

关键词： .entanglement swapping less entangled state unitary transformation smaller entanglement

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Optical realization of universal quantum cloning

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Physical Review A 2001年第1期64卷 012315-012315页

作者： Yun-Feng Huang Wan-Li Li Chuan-Feng Li Yong-Sheng Zhang Yun-Kun Jiang Guang-Can Guo Laboratory of Quantum Communication and Quantum Computation and Department of Physics University of Science and Technology of China

Beyond the no-cloning theorem, the universal symmetric quantum cloning machine was first addressed by Bužek and Hillery. Here, we realized the 1→2 qubit Bužek-Hillery cloning machine with linear optical devices. This method relies on the representation of several qubits by a single photon. We showed that the fidelities between the two output qubits and the original qubit are both 56 (which proved to be the optimal fidelity of 1→2 qubit universal cloner) for arbitrary input pure states.

关键词： .quantum state universal quantum density operators delities Optical realization quantum cloning machine single photon original qubit

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Realizing probabilistic identification and cloning of quantum states via universal quantum logic gates

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Physical Review A 2000年第6期61卷 062310-062310页

作者： Chuan-Wei Zhang Zi-Yang Wang Chuan-Feng Li Guang-Can Guo Laboratory of Quantum Communication and Quantum Computation and Department of Physics University of Science and Technology of China

Probabilistic quantum cloning and identifying machines can be constructed via unitary-reduction processes [Duan and Guo, Phys. Rev. Lett. 80, 4999 (1998)]. Given the cloning (identifying) probabilities, we derive an explicit representation of the unitary evolution and corresponding Hamiltonian to realize probabilistic cloning (identification). The logic networks are obtained by decomposing the unitary representation into universal quantum logic operations. The robustness of the networks is also discussed. Our method is suitable for a k-partite system, such as quantum computer, and may be generalized to general state-dependent cloning and identification.

关键词： .Quantum computation quantum states universal quantum unitary evolution logic gates unitary representation Rev Lett Realizing probabilistic probabilistic identification quantum cloning identifying machines probabilistic cloning k-partite cloning and identification

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