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Entanglement-enhanced classical communication through generalized amplitude damping channel 下载免费PDF全文
The problem of sending a single classical bit through a generalized
amplitude damping channel is considered. When two transmissions
through the channel are available as a resource, we find that two
entangled transmissions can enhance the capability of receiver's
judging information correctly under certain conditions compared with
two product-state transmissions. In addition, we find a special case
in which the two entangled transmissions can always make a
classical bit more effectively disable the noise influence. 相似文献
43.
Quantum entanglement in the system of a moving V-type three-level atom interacting with the SU(1,1)-related coherent fields 下载免费PDF全文
In a system with a moving V-type three-level atom interacting with
the SU(1,1)-related coherent fields,
we investigate the entanglement between the moving three-level atom
and the SU(1,1)-related coherent fields by
using the quantum-reduced entropy, and that
between the SU(1,1)-related
coherent fields by using the quantum relative
entropy of entanglement. It is shown that the two kinds of entanglement
are dependent on the atomic motion and
exhibit the periodic evolution with a
period of 2π/p. The maximal atom--field qutrit entanglement
state can be prepared, and the entanglement preservation
of the SU(1,1)-related coherent fields
can be realized in the interacting process
via the appropriate selection of system
parameters and interaction time. 相似文献
44.
Entanglement and photon statistics of output fields from beam splitter for binomial state inputs 总被引:1,自引:0,他引:1 下载免费PDF全文
The entanglement properties are investigated based on linear entropy, and nonclassicalities are examined of output fields from a beam splitter for pure binomial state inputs. It is shown that the properties of the entanglement and the photon statistics of output fields are not only strongly dependent on the parameters of input binomial states but also quite involved with the nature of the beam splitter. The best entanglement can be obtained when the parameters of both input states and the beam splitter are chosen appropriately. Finally, we analyse briefly the distinguishability between the joint input state and the joint output state. 相似文献
45.
Linear entropy dynamics of the field in the Jaynes-Cummings model with an intensity-dependent coupling in the dispersive approximation 下载免费PDF全文
We present the linear entropy dynamics of the field state in the dispersive cavity in the Jaynes-Cummings model with an intensity-dependent coupling in the dispersive approximation, and investigate the influence of dissipation on entanglement between the field and the atoms. We show that the coherence properties of the field are also affected by the cavity when the nonlinear process of the field interacting with the atoms with an intensity-dependent coupling is involved, and find that the dissipation constant, the intensity of the field and the atomic distribution angle have different influence on the coherence properties of the field. 相似文献
46.
In this paper,we investigate the quantum entanglement in a two-dimensional ion trap system.we discuss the quantum entanglement between the ion and phonons by using reduced entropy,and that between two degrees of freedom of the vibrational motion along x and y directions by using quantum relative entropy.We discuss also the influence of initial state of the system on the quantum entanglement and the relation between two entanglements in the trapped ion system. 相似文献
47.
原子质心运动和场模结构对场相位动力学的影响 总被引:4,自引:1,他引:3
运用Pigg-Barnett的厄米相位公式,研究了J-C模型中原子质心运动和场模结构对场相位动力学的影响。在未考虑原子质心动力和考虑原子质心运动两种情况下,分别给出了场相位概率分布和相位涨落随时间的变化规律,并比较了两种情况下的场相位动力学,结果表明:原子质心动力导致场相位动力学的周期性演化,场模结构参数决定其周期的大小。 相似文献
48.
运用量子信息熵理论研究了双光子过程中任意初态二能级原子与相干场相互作用的信息熵压缩,讨论了系统初态对原子信息熵压缩的影响. 并且比较了分别从基于信息熵不确定关系和海森伯不确定关系出发得出的结果. 结果表明通过选择适当初始的原子分布角,原子的混合度和相干场的位相角,可以分别控制原子信息熵压缩的偶极矩分量数、压缩频率、压缩幅度和压缩方向. 当原子反转为零时,基于海森堡不确定关系的方差压缩定义不再有效,而信息熵压缩实现了对原子压缩效应的高灵敏量度.
关键词:
二能级原子
双光子过程
信息熵压缩
方差压缩 相似文献
49.
50.
Entropy squeezing for a V-type three-level atom interacting with a single-mode field and passing through the amplitude damping channel with weak measurement 下载免费PDF全文
The entropy squeezing of a V-type three-level atom interacting with a single-mode field and passing through the amplitude damping channel is investigated in detail. Our results show that when coupled to the single-mode field, the atom in appropriate initial states can not only generate obvious entropy squeezing but also keep in the optimal squeezing state,while passing through the amplitude damping channel, the atom can generate entropy squeezing under the control of the weak measurement. Besides, it is proved again that as a measurement method for atomic squeezing, the entropy squeezing is precise and effective. Therefore our work is instructive for experiments in preparing three-level system information resource with ultra-low quantum noise. 相似文献