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Phase effect on dynamics of quantum discord modulated by interaction between qubits

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Chinese physics B 2015年第9期24卷 101-105页

作者：王国友郭有能曾浩生 key laboratory of Low-Dimensional quantum structures and quantum control of ministry of education Department of PhysicsHunan Normal University

We study the effects of the interaction strength and the initial phase on the dynamics of quantum discord in a twoqubit system under both spontaneous emission and dephasing noisy channels. It is shown that the time evolution of quantum discord displays quicker oscillations with increasing inter-qubit interaction strength but the effect of the initial phase closely depends on the interaction between the qubits. Only for non-zero inter-qubit interaction cases, the evolution of quantum discord is affected by the initial phase and its oscillating amplitude increases with increasing initial phase. A comparison between evolutions of quantum discord and entanglement is also made.

关键词： quantum discord spontaneous emission dephasing

The squeezing dynamics of two independent atoms by detuning in two non-Markovian environments

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Chinese physics B 2013年第12期22卷 82-86页

作者：邹红梅方卯发杨百元 key laboratory of Low-Dimensional quantum structures and quantum control Ministry of Education and Department of Physics Hunan Normal University

The squeezing dynamics of two independent two-level atoms off-resonantly coupled to two non-Markovian reservoirs is studied by the time-convolutionless master-equation approach. We find that the squeezing of two atoms is dependent on both detuning and the non-Markovian effect. Our results show that, in the non-Markovian regime, the bigger the detuning and the stronger the non-Markovian effect are, the larger the strength of the squeezing is. And the squeezing of two atoms can be effectively protected for a long time when both the non-Markovian effect and detuning are present simultaneously. The physical mechanism is that the detuning not only can promote the feedback of information from the environment into the atomic system but also can greatly suppress the atomic decay in the non-Markovian regime.

关键词： non-Markovian effect detuning squeezing two-level atom

Distillability sudden death in a two qutrit systems under a thermal reservoir

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Chinese physics B 2012年第8期21卷 241-245页

作者：黄江方卯发杨百元刘翔 key laboratory of Low-Dimensional quantum structures and quantum control of ministry of education and Department of PhysicsHunan Normal University

The dynamics of distillability entanglement between qutrit-qutrit systems interacting with a thermal reservoir is investigated in this paper. We discovered an interesting phenomenon that under a thermal reservoir certain initially prepared free=entangled states become bound-entangled states in a finite time, which is called distillability sudden death （DSD）. We use a realignment criterion to measure the nine-dimensional density matrix of the entanglement. Moreover, we analyze some other parameters to investigate the effects to the systems. Explanations are then given.

关键词： distillability entanglement distillability sudden death realignment criterion

Implementation of One-Way quantum Computing with a Hybrid Solid-State quantum System

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Chinese Journal of Electronics 2017年第1期26卷 27-34页

作者： ZHAO Yujing CHEN Xiongwen SHI Zhengang ZHOU Fang XIANG Shaohua SONG Kehui department of physics Huaihua University key laboratory of Low-dimensional quantum structures and quantum control of ministry of education and Department of Physics Hunan Normal University

We proposed an efficient scheme for implementing the large-scale one-way quantum computing(QC)with a novel hybrid solid-state quantum system. This system consists of N Nitrogen-vacancy(N-V) centers coupled to N separate Transmission line resonators(TLRs), which are interconnected by a Current-biased Josephson junction(CBJJ) superconducting phase qubit. We showed the way of preparation of N-qubit linear cluster state with N N-V centers, then we demonstrated the way of extending cluster state by connecting two pieces of linear cluster states into two-dimensional cluster state, last, with our designed new structures, we demonstrated the QC basic *** means that our scheme may open up promising possibilities for implementing the practical and scalable one-way quantum computers with the hybrid solid-state quantum system. We discussed the experimental feasibility of our system.

关键词： Solid-state quantum system quantum computing(QC) N nitrogenvacancy centers

Exact Vortex Clusters of Two-Dimensional quantum Fluid with Harmonic Confinement

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Chinese physics Letters 2013年第4期30卷 14-17页

作者： CHONG Gui-Shu ZHANG Ling-Ling HAI Wen-Hua School of physics and Microelectronics Hunan UniversityChangsha 410082 department of physics and key laboratory of Low-Dimensional quantum structure and quantum control of ministry of education Hunan Normal UniversityChangsha 410081

A family of exact analytical solutions of vortices in quantum fluid governed by a two-dimensional time-dependent Schr?dinger equation is presented,which describes different kinds of vortex *** dynamics of different vortex clusters,such as the single vortex,vortex pair,vortex dipole and vortex trimer in a two-dimensional quantum fluid are analytically studied based on these exact *** time evolutions of the wave of such vortices are demonstrated,and the orbits of motion of singular points in the vortices are also *** interactions of vortices in many-vortex clusters are discussed.A repulsive interaction between vortices with the same topological charge,and inter-annihilation and inter-creation of vortices with opposite topological charge,are shown.

关键词： vortex exact topological

Design and simulation of an accelerometer based on NV center spin–strain coupling

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Chinese physics B 2024年第1期33卷 192-198页

作者：季鲁敏赵立业王裕海 key laboratory of Micro-Inertial Instrument and Advanced Navigation Technology Ministry of EducationDepartment of Instrument Science and EngineeringSoutheast UniversityNanjing 210096China

The nitrogen-vacancy (NV) center quantum systems have emerged as versatile tools in the field of precision measurement because of their high sensitivity in spin state detection and miniaturization potential as solid-state *** this paper,an acceleration sensing scheme based on NV spin–strain coupling is proposed,which can effectively eliminate the influence of the stray noise field introduced by traditional mechanical *** the finite element simulation,it is found that the measurement bandwidth of this ensemble NV spin system ranges from 3 kHz to hundreds of kHz with structure√*** required power is at the sub-μW level,corresponding to a noise-limited sensitivity of 6.7×10^(-5) /√*** with other types of accelerometers,this micro-sized diamond sensor proposed here has low power consumption,exquisite sensitivity,and integration *** research opens a fresh perspective to realize an accelerometer with appealing comprehensive performance applied in biomechanics and inertial measurement fields.

关键词： nitrogen-vacancy(NV)accelerometer spin–strain diamond

Distributed quantum information processing via quantum dot spins

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Chinese physics B 2010年第3期19卷 76-82页

作者：刘军王琼匡乐满曾浩生 key laboratory of Low-Dimensional quantum structures and quantum control of ministry of education and Department of PhysicsHunan Normal University

We propose a scheme to engineer a non-local two-qubit phase gate between two remote quantum-dot spins. Along with one-qubit local operations, one can in principal perform various types of distributed quantum information processing. The scheme employs a photon with linearly polarisation interacting one after the other with two remote quantum-dot spins in cavities. Due to the optical spin selection rule, the photon obtains a Faraday rotation after the interaction process. By measuring the polarisation of the final output photon, a non-local two-qubit phase gate between the two remote quantum-dot spins is constituted. Our scheme may has very important applications in the distributed quantum information processing.

关键词： quantum-dot spins nonlocal quantum gates polarised photon

Effects of electrostatic interactions and geometrical confinements on depletion interactions in charged colloidal system

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Chinese physics B 2009年第3期18卷 1287-1293页

作者：黄立新肖长明胡苹高海峡 key laboratory of Low-dimensional quantum structures and quantum control of ministry of education Hunan Normal University department of physics Hunan Normal University

In a charged colloidal system, the influence on depletion interaction between two like-charged macro-ions is studied through Monte Carlo simulation in this paper. The numerical results show that this depletion force is affected by both the electrostatic interactions between charged spheres and charged plates and by the geometrical factor of the two charged plates, and they further indicate that the influence of geometrical confinement on the depletion interaction is larger than that of electrostatic potential.

关键词： depletion interaction geometrical confinement

Depletion interactions in a cylindric pipeline

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Chinese physics B 2009年第8期18卷 3585-3590页

作者：黄立新高海峡李春树肖长明 key laboratory of Low-dimensional quantum structures and quantum control of ministry of education Hunan Normal University department of physics Hunan Normal University

In a colloidal system confined by a small cylindric pipeline, the depletion interaction between two large spheres is different to the system confined by two plates, and the influence on depletion interaction from the pipeline is related to both the size and shape of it. In this paper, the depletion interactions in the systems confined by pipelines of different sizes or different shapes are studied by Monte Carlo simulations. The numerical results show that the influence on depletion force from the cylindric pipeline is stronger than that from two parallel plates, and the depletion force will be strengthened when the diameter of the cylinder is decreased. In addition, we also find that the depletion interaction is rather affected if the shape change of the pipeline is slightly changed, and the influence on depletion force from the shape change is stronger than that from the size change.

关键词： depletion interactions cylindric pipeline colloidal system