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Statistical properties of coherent photon-subtracted two-mode squeezed vacuum and its application in quantum teleportation

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Chinese Physics B 2014年第5期23卷 46-51页

作者：张国平郑凯敏刘世右胡利云 College of Physics and Communication Electronics Jiangxi Normal University key laboratory of optoelectronic and telecommunication of jiangxi

We introduce a kind of non-Gaussian entangled state, which can be obtained by operating a non-local coherent photon-subtraction operation on a two-mode squeezed vacuum. It is found that its normalization factor is only related to the Legendre polynomials, which is a compact expression. Its statistical properties are discussed by the negative region Wigner function with the analytical expression. As an application, the quantum teleportation for coherent states is considered by using the non-Gaussian state as an entangled channel. It is found that the teleportation fidelity can be enhanced by this non-Gaussian operation.

关键词： coherent photon subtraction two-mode squeezed vacuum quantum teleportation fidelity

Operating a geometric quantum gate by external controllable parameters

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Chinese Physics B 2010年第1期19卷 84-89页

作者：嵇英华蔡十华乐建新王资生 College of Physics and Communication Electronics Jiangxi Normal University key laboratory of optoelectronic and telecommunication of jiangxi

A scheme to perfectly preserve an initial qubit state in geometric quantum computation is proposed for a single- qubit geometric quantum gate in a nuclear magnetic resonance system. At first, by adjusting some magnetic field parameters, one can let the dynamic phase be proportional to the geometric phase. Then, by controlling the azimuthal angle in the initial state, we may realize a geometric quantum gate whose fidelity is equal to one under cyclic evolution. This means that the quantum information is no distortion in the process of geometric quantum computation.

关键词： geometric phase geometric quantum gate fidelity

Controlled decoherence of three-level rf-SQUID qubit with asymmetric potential

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Chinese Physics B 2010年第3期19卷 61-65页

作者：嵇英华赖慧芳蔡十华王资生 College of Physics and Communication Electronics Jiangxi Normal University key laboratory of optoelectronic and telecommunication of jiangxi

A scheme is proposed to controll the decoherence of three-level rf-SQUID qubit with asymmetric potential by designing an external electric circuit for superconductive flux qubit. The results show that it may not only ... 详细信息

关键词： gate speed quantum NOT gates decoherence time controll

Controlled decoherence of floating flux qubits

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Chinese Physics B 2010年第11期19卷 73-77页

作者：嵇英华徐林 College of Physics and Communication Electronics Jiangxi Normal University key laboratory of optoelectronic and telecommunication of jiangxi

In Born-Markov approximation, this paper calculates the energy relaxation time T1 and the decoherence time T2 of a floating flux qubit by solving the set of Bloeh-Redfield equations. It shows that there are two main factors influencing the floating flux qubits： coupling capacitor in the circuit and the environment resistor. It also discusses how to improve the quantum coherence time of a qubit. Through shunt connecting/ series connecting inductive elements, an inductive environment resistor is obtained and further the reactance component of the environment resistor is improved, which is beneficial to the enhancement of decoherence time of floating flux qubits.

关键词： decoherence time floating flux qubit control

Comparison between photon annihilation-then-creation and photon creation-then-annihilation thermal states:Non-classical and non-Gaussian properties

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Chinese Physics B 2014年第7期23卷 251-256页

作者：徐学翔袁洪春王燕 College of Physics and Communication Electronics Jiangxi Normal University key laboratory of optoelectronic and telecommunication of jiangxi College of optoelectronic Engineering Changzhou Institute of Technology

We investigate the nonclassical properties of arbitrary number photon annihilation-then-creation operation （AC） and creation-then-annihilation operation （CA） to the thermal state （TS）, whose normalization factors are related to the polylog- arithm function. Then we compare their quantum characters, such as photon number distribution, average photon number, Mandel Q-parameter, purity and the Wigner function. Because of the noncommutativity between the annihilation operator and the creation operator, the ACTS and the CATS have different nonclassical properties. It is found that nonclassical properties are exhibited more strongly after AC than after CA. In addition we also examine their non-Gaussianity. The result shows that the ACTS can present a slightly bigger non-Gaussianity than the CATS.

关键词： annihilation-then-creation creation-then-annihilation Wigner function nonclassicality

Defects‑Rich Heterostructures Trigger Strong Polarization Coupling in Sulfides/Carbon Composites with Robust Electromagnetic Wave Absorption

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Nano-Micro Letters 2025年第1期17卷 528-547页

作者： Jiaolong Liu Siyu Zhang Dan Qu Xuejiao Zhou Moxuan Yin Chenxuan Wang Xuelin Zhang Sichen Li Peijun Zhang Yuqi Zhou Kai Tao Mengyang Li Bing Wei Hongjing Wu Mengyang Li Bing Wei Hongjing Wu School of Physics Xidian UniversityXi’an 710071People’s Republic of China School of Advanced Materials and Nanotechnology State Key Discipline Laboratory of Wide Band Gap Semiconductor TechnologyXidian UniversityXi’an 710071People’s Republic of China School of Microelectronics Xidian UniversityXi’an 710071People’s Republic of China School of telecommunication Engineering Xidian UniversityXi’an 710071People’s Republic of China MOE key laboratory of Material Physics and Chemistry Under Extraordinary School of Physical Science and TechnologyNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China The Ministry of Education key laboratory of Micro and Nano Systems forAerospace School of Mechanical EngineeringNorthwestern PolytechnicalUniversityXi’an 710072People’s Republic of China

Defects-rich heterointerfaces integrated with adjustable crystalline phases and atom vacancies,as well as veiled dielectric-responsive character,are instrumental in electromagnetic *** methods,however,constrain their delicate ***,an innovative alternative is proposed:carrageenan-assistant cations-regulated(CACR)strategy,which induces a series of sulfides nanoparticles rooted in situ on the surface of carbon *** unique configuration originates from strategic vacancy formation energy of sulfides and strong sulfides-carbon support interaction,benefiting the delicate construction of defects-rich heterostructures in M_(x)S_(y)/carbon composites(M-CAs).Impressively,these generated sulfur vacancies are firstly found to strengthen electron accumulation/consumption ability at heterointerfaces and,simultaneously,induct local asymmetry of electronic structure to evoke large dipole moment,ultimately leading to polarization coupling,i.e.,defect-type interfacial ***“Janus effect”(Janus effect means versatility,as in the Greek two-headed Janus)of interfacial sulfur vacancies is intuitively confirmed by both theoretical and experimental investigations for the first ***,the sulfur vacancies-rich heterostructured Co/Ni-CAs displays broad absorption bandwidth of 6.76 GHz at only 1.8 mm,compared to sulfur vacancies-free CAs without any dielectric *** defects-rich heterostructures,this one-pot CACR strategy may steer the design and development of advanced nanomaterials,boosting functionality across diverse application domains beyond electromagnetic response.

关键词： Defects-rich heterointerfaces Sulfides Polarization coupling Electromagnetic wave absorption

Avoiding the decay of entanglement for coupling two-qubit system interacting with a non-Markov environment

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Chinese Physics B 2011年第7期20卷 64-68页

作者：嵇英华刘咏梅王资生 College of Physics and Communication Electronics Jiangxi Normal University key laboratory of optoelectronic and telecommunication of jiangxi College of Mathematics and Information Science of jiangxi Normal University

The entanglement evolution of the coupled qubits interacting with a non-Markov environment is investigated in terms of concurrence. The results show that the entanglement of the quantum systems depends not only on the initial state of the system but also on the coupling between the qubit and the environment. For the initial state （100） ± ｜11〉）/√2, the coupled qubits will always been in the maximum entangled state under an asymmetric coupling. For the initial state （｜01〉 ± ＋10〉）/√2, in contrast, the entangling degree of the coupled qubits is always equal to unity and does not depend on the evolving time under the symmetric coupling. We find that the stronger the interaction between the qubits is, the better the struggle against the entanglement sudden death is.

关键词： entanglement symmetry non-Markov process concurrence

Effect of mutual inductance coupling on superconducting flux qubit decoherence

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Chinese Optics Letters 2009年第1期7卷 78-81页

作者：江燕燕徐华兰嵇英华 College of Physics and Communication Electronics Jiangxi Normal University Department of Physics Anqing Teachers College key laboratory of optoelectronic and telecommunication of jiangxi

In the Born-Markov approximation and two-level approximation, and using the Bloch-Redfield equation, the decoherence property of superconducting quantum circuit with a flux qubit is investigated. The influence ou decoherence of the mutual inductance coupling between the circuit components is complicated. The mutual inductance coupling between different loops will decrease the decoherence time. However, the mutual inductance coupling of the same loop, in a certain interval, will increase the decoherence time. Therefore, we can control the decoherence time by changing the mutual inductance parameters such as the strength and direction of coupling.

关键词： Electric conductivity Quantum optics Superconductivity

Thermal vacuum state for the two-coupled-oscillator model at finite temperature: Derivation and application

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Chinese Physics B 2013年第9期22卷 217-221页

作者：徐学翔胡利云郭琴范洪义 College of Physics and Communication Electronics Jiangxi Normal University key laboratory of optoelectronic and telecommunication of jiangxi Department of Physics Shanghai Jiao Tong University

Following the spirit of thermo field dynamics initiated by Takahashi and Umezawa, we employ the technique of integration within an ordered product of operators to derive the thermal vacuum state （TVS） for the Hamiltonian H of the two-coupled-oscillator model. The ensemble averages of the system are derived conveniently by using the TVS. In addition, the entropy for this system is discussed based on the relation between the generalized Hellmann-Feynman theorem and the entroy variation in the context of the TVS.

关键词： partial trace method thermo field dynamics integration within an ordered product of operators,generalized Hellmann-Feynman theorem