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Search Results: 1 - 10 of 218037 matches for " 刘堂昆 "
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Entropy evolvement properties in a system of Schr?dinger cat state light field interacting with two entangled atoms
Entropy evolvement properties in a system of Schrodinger cat state light field interacting with two entangled atoms

Liu Tang-Kun,

中国物理 B , 2006,
Abstract: The field entropy can be regarded as a measurement of the degree of entanglement between the light field and the atoms of a system which is composed of two-level atoms initially in an entangled state interacting with the Schr\"{o}dinger cat state. The influences of the strength of light field and the phase angle between the two coherent states on the field entropy are discussed by using numerical calculations. The result shows that when the strength of light field is large enough the field entropy is not zero and the degrees of entanglement between the atoms and the three different states of the light fields are equal. When the strength of the light field is small, the degree of entanglement is maximum in a system of the two entangled atoms interacting with an odd coherent state; it is intermediate for a system of the two entangled atoms interacting with the Yurke--Stoler coherent state, and it is minimum in a system of the two entangled atoms interacting with an even coherent state.
Entanglement between two atoms in the system of Schr?dinger cat state interacting with two entangled atoms
Entanglement between two atoms in the system of SchrSdinger cat state interacting with two entangled atoms

Liu Tang-Kun,

中国物理 B , 2007,
Abstract: By the negative eigenvalues of partial transposition of density matrix, this paper investigates the time evolution of entanglement of the two entangled atoms in the system of two atoms interacting with SchrSdinger cat state. The result shows that the two atoms are always in the entanglement state, and the degree of entanglement between the two atoms exhibits ordinary collapses and revivals at 0.2 degree of entanglement, when the light field is large enough. On the other hand, the reinforcement of three different light fields on the degree of entanglement between two atoms is not evident.第一段]
Entanglement evolution in an anisotropic two-qubit Heisenberg XYZ model with Dzyaloshinskii-Moriya interaction
陈涛,黄燕霞,单传家,李金星,继兵,
中国物理 B , 2010,
Abstract:
QUANTUM EFFECTS OF A NON-DISSIPATIVE MESOSCOPIC CIRCUIT WITH INDUCTANCE COUPLING
无耗散介观电感耦合电路的量子效应

Wang Jisuo,Liu Tangkun,Zhan Mingsheng,
王继锁
,,詹明生

光子学报 , 2000,
Abstract: Starting from the equation of motion of a non dissipative mesoscopic circuit with inductance coupling,the quantum fluctuations of charge and current in the eigenstates of the system and the squeezed vacuum state are investigated.The results show that the quantum fluctuations of the charge and current exist in all of the states.The fluctuations in each component circuit are connected.
QUANTUM FLUCTUATIONS OF A MESOSCOPIC CAPACITANCE COUPLING CIRCUITS IN A DISPLACED SQUEEZED FOCK STATE
平移压缩Fock态下介观电容耦合电路的量子涨落

WANG JI-SUO,LIU TANG-KUN,ZHAN MING-SHENG,
王继锁
,,詹明生

物理学报 , 2000,
Abstract: Starting from the classical equation of motion for a mesoscopic capacitance coupling circuits,the quantum fluctuations of charge and current of the circuits in a displaced squeezed Fock state are investigated.It is found that the quantum fluctuations of charge and current in each component circuit depend on the device of the two loop circuits and squeezing parameters,while the fluctuation does not depend on displacement parameters.
A new kind of even and odd nonlinear coherent states and their quantum statistical properties
一种新的奇偶非线性相干态及其量子统计性质

Wang Ji-Suo,Feng Jian,Liu Tang-Kun,Zhang Ming-Sheng,
王继锁
,冯健,,詹明生

物理学报 , 2002,
Abstract: 定义了一种新的奇偶非线性相干态即算符B^2B=a/f(N)] 的两个正交归一本征态,利用数值计算方法研究了它们的量子统计性质。结果表明,与通常的奇偶相干态不同。在参数|β|变化的某些范围内,只有偶非线性相干态可以存在压缩效应,而振幅平方压缩和反聚束效应在这两个态中均可以呈现。
Nonclassical properties of the orthonormalized eigenstates of the operator (^af(^n))k
算符(^af(^n))k正交归一本征态的非经典特性

Wang Ji-Suo,Feng Jian,Liu Tang-Kun,Zhan Ming-Sheng,
王继锁
,冯健,,詹明生

物理学报 , 2002,
Abstract: 证明了算符(a^f(n^))k(k≥3)的k个正交归一本征态的完备性,引入了反聚束效应和一种新的高阶压缩,研究了算符(a^f(n^))k的k个本征态的反聚束效应和高阶压缩特性.结果表明,这些态可以构成一个完备的希尔伯特(Hilbert)空间,它们均可呈现反聚束效应,且当k为偶数时它们可呈现M阶M=(n+12)k;n=0,1,2,…]压缩效应
Phase probability distributions of Roy-type even and odd nonlinear coherent states
Roy-型奇偶非线性相干态的位相概率分布

Wang Ji-Suo,Liu Tang-Kun,Feng Jian,Sun Jin-Zuo,
王继锁
,,冯 健,孙金祚

物理学报 , 2004,
Abstract: Based on our previous work, with the aid of the numerical method, the phase probability distributions of Roy-type even and odd nonlinear coherent states are investigated. It is shown that the distributions for the states are rather different, and unlike the case of ordinary even and odd coherent states the Pegg-Barnett distribution clearly reflects the different characters of quantum interference in the case of Roy-type even and odd nonlinear coherent states.
Entropy evolution properties in a system of two entangled atoms interacting with light field
Liu Tang-Kun,Wang Ji-Suo,Feng Jian,Zhan Ming-Sheng,
,王继锁,冯 健,詹明生

中国物理 B , 2005,
Abstract: In this paper, we use the field entropy as a measurement of the degree of entanglement between the light field and the atoms of the system which is composed of two dipole—dipole interacting two-level atoms initially in an entangled state interacting with the single mode coherent field in a Kerr medium. The influence of the coupling constant of dipole—dipole interaction between atoms and the coupling strength of the Kerr medium with the light field and the intensity of the light field on the field entropy are discussed by numerical calculations. It is shown that when the coupling strength of the Kerr medium with the light field is large enough, and the light field is strong, the degree of entanglement between the atoms with the light field becomes weaker. The degree of entanglement only changes slightly with the change of the coupling constant of dipole—dipole interaction between atoms.
Quantum dense coding using a peculiar tripartite entangled state
Cheng Wei-Wen,Huang Yan-Xi,Liu Tang-Kun,Li Hong,
程维文
,黄燕霞,,李宏

中国物理 B , 2007,
Abstract: Following a recent proposal ( Phys. Lett. A 346 (2005) 330) about quantum dense coding using a tripartite entangled GHZ state and W state, this paper proposes an experimentally feasible scheme for dense coding in cavity QED by using another peculiar tripartite entangled state. In the scheme the atoms interact simultaneously with a highly detuned cavity mode with the assistance of a classical field, the successful probability of dense coding scheme with this peculiar tripartite entangled state equals 1.
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