共查询到20条相似文献,搜索用时 312 毫秒
1.
Dissipation of a two-mode squeezed vacuum state in the single-mode amplitude damping channel 下载免费PDF全文
We explore how a two-mode squeezed vacuum state sechθ ea+b+ tanh θ |00> evolves when it undergoes a singlemode amplitude dissipative channel with rate of decay κ. We find that in this process not only the squeezing parameter decreases, tanh θ → e-κt tanh θ, but also the second-mode vacuum state evolves into a chaotic state exp{b+bln[1 - e-2κt tanh2 θ]}. The outcome state is no more a pure state, but an entangled mixed state. 相似文献
2.
A scheme for approximate conditional teleportation of entangled two-mode cavity state without Bell state measurement 下载免费PDF全文
An alternative scheme to approximately conditionally teleport entangled two-mode cavity state without Bell state measurement in cavity QED is proposed. The scheme is based on the resonant interaction of a ladder-type three-level atom with two bimodal cavities. The entangled cavity state is reconstructed with only one atom interacting with the two cavities successively. 相似文献
3.
Nonlinear two-mode squeezing obtained by analysing two-mode exponential quadrature operators in entangled state representation 下载免费PDF全文
By analysing the properties of two-mode quadratures in an entangled state representation (ESR) we derive from ESR some complicated exponential quadrature operators for nonlinear two-mode squeezing, which directly leads to wave function of the nonlinear squeezed state in ESR. 相似文献
4.
对文献[4]的结果作了进一步推导,用纠缠态表象方法计算了对双模压缩真空态第一个模场作正交振幅分量测量的结果,发现第二个模塌缩到一个压缩态,其显式被导出。 相似文献
5.
ZHENG Shi-Biao 《理论物理通讯》2002,38(8)
We propose a scheme to generate various nonclassical vibrational states in the collective motion of twotrapped ions, such as squeezed states, Schrodinger cat states, and SU(2) states. It is based on Raman-type excitations.Two-mode coupling between the center-of-mass and relative vibrational modes can also be realized. 相似文献
6.
We study the properties of two-mode phase operator √(a++b)/(a+b+) and the phase state by constructing the number-difference orthonormal state |q, г). We prove that |q, г ) constitutes a complete and orthonormal representation (number-difference representation). We show that two-mode phase operator √(a++b)/(a+b+) exhibits its phase behavior explicitly in the number-difference representation, which resembles the single-mode phase operator eiψ ≡ (1/√a+a+1)a. The corresponding phase state is also studied. 相似文献
7.
We propose a method for generating SU (1, 1) intelligent states for the center of mass and relative motionalmodes for two trapped ions. In our scheme, only three laser beams are employed, and their directions are all the sameas the direction of the two trapped ions‘ alignment. Under certain conditions, our desired states are obtained as thesteady-state solution of the master equation of the system. 相似文献
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9.
ZHENG Shi-Biao 《理论物理通讯》2002,38(2):213-216
We propose a scheme to generate various nonclassical vibrational states in
the collective motion of two trapped ions, such as squeezed states,
Schrödinger cat states, and SU(2) states. It is based on Raman-type
excitations. Two-mode coupling between the center-of-mass and relative
vibrational modes can also be realized. 相似文献
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12.
SONG Tong-Qiang 《理论物理通讯》2004,42(8)
Using the properties of the inverses of annihilation and creation operators of f-oscillator we introduce the notion of nonlinear Einstein Podolsky-Rosen entangled state and study its properties. 相似文献
13.
FULi-Ping SUNTian-Yu 《理论物理通讯》2003,40(4):486-488
We propose a method for generating SU(1, 1) intelligent states for the center of mass and relative motional modes for two trapped ions. In our scheme, only three laser beams are employed, and their directions are all the same as the direction of the two trapped ions‘ alignment. Under certain conditions, our desired states are obtained as the steady-state solution of the master equation of the system. 相似文献
14.
We propose a method to create several motional states simultaneously in two-trapped ions. It relies ontwo standing wave lasers illuminating homogeneously both ions. By tuning the frequencies of the two standing wavesto excite resonantly different sidebands of center-of-mass or breathing mode, several motional states, such as one- ortwo-mode squeezed states and their superpositions, and the beam-splitter output states, are generated. 相似文献
15.
Efficient scheme for the preparation of arbitrary anticorrelated states of a two-mode field 下载免费PDF全文
A scheme is presented for generating any anticorrelated state of a two-mode field. In the scheme a sequence of suitably prepared three-level V-type atoms are sent across a two-mode cavity initially in the vacuum state. The detection of all the atoms in the ground state collapses the two-mode field to the desired state. 相似文献
16.
The transfer of the quantum correlation from two-mode nonclassical state field to the supercurrents in two distant SQUID rings 下载免费PDF全文
We have considered two distant mesoscopic superconducting quantum
interference device (SQUID) rings A and B in the presence of two-mode
nonclassical state fields and investigated the correlation of the
supercurrents in the two rings using the normalized correlation
function $C_{\rm AB}$. We show that when the parameter $\alpha$ is
very small for the separable state with the density matrix $\hat
{\rho } = (\left| {\alpha , - \alpha } \right\rangle \left\langle
{\alpha , - \alpha } \right| + \left| { - \alpha ,\alpha }
\right\rangle \left\langle { - \alpha ,\alpha } \right|) / 2$ and
entangled coherent state (ECS) $\left| u \right\rangle = N_1 (\left|
{\alpha , - \alpha } \right\rangle + \left| { - \alpha ,\alpha }
\right\rangle )$ fields, the dynamic behaviours of the normalized
correlation function $C_{\rm AB}$ are similar, but it is quite
different for the entangled coherent state $\left| {u}'
\right\rangle = N_2 (\left| {\alpha , - \alpha } \right\rangle -
\left| { - \alpha ,\alpha } \right\rangle )$ field. When the
parameter $\alpha $ is very large, the dynamic behaviours of $C_{\rm
AB}$ are almost the same for the separable state, entangled coherent
state $\left| u \right\rangle $ and $\left| {u}' \right\rangle $
fields. For the two-mode squeezed vacuum state field the maximum of
$C_{\rm AB}$ increases monotonically with the squeezing parameter
$r$, and as $r \to \infty $, $C_{\rm AB} \to 1$. This means that the
supercurrents in the two rings A and B are quantum mechanically
correlated perfectly. It is concluded that not all the quantum
correlations in the two-mode nonclassical state field can be
transferred to the supercurrents; and the transfer depends on the
state of the two-mode nonclassical state field prepared. 相似文献
17.
CUI Hui-Ping ZOU Jian LI Jian SHAO Bin 《理论物理通讯》2008,49(5):1182-1186
We investigate the influence of the Stark shift on the entanglement transfer from the two-mode squeezed vacuum state field to two spatially separated atoms in two-photon processes. Our results show that the Stark shift plays an important role in such entanglement transfer. We find that when the Stark shift parameter r is small, the degree of entanglement between the two atoms increases with the increasing of the squeezing parameter ξ first, and after achieving its maximal value, the degree of entanglement will decrease to zero with the increasing of ξ; while for big r, E will increase with the increasing of ξ. 相似文献
18.
We propose a method to create several motional states imultancously in two -trapped ions.It relies on two standing wave lasers illuminating homogeneously both ions.By tuning the frequencies of the two standing waves to excite resonantly different sidebands of center-of -mass or breathing mode.several motional states.such as one-or two-mode squeezed states and their superpositions,and the beam-splitter output states,are generated. 相似文献
19.
SONGTong-Qiang 《理论物理通讯》2004,42(2):271-274
Using the properties of the inverses of annihilation and creation operators of f-oscillator we introduce the notion of nonlinear Einstein Podolsky Rosen entangled state and study its properties. 相似文献
20.
Single-mode quadrature-amplitude measurement for generalized two-mode squeezed states studied by virtue of the entangled state representation 下载免费PDF全文
The result of one-mode quadrature-amplitude measurement for some generalized two-mode squeezed states has been studied by virtue of the entangled state representation of the corresponding two-mode squeezing operators. We find that the remaining field-mode simultaneously collapses to the single-mode squeezed state with more stronger squeezing. The measurement result caused by a single-mode squeezed state projector is also calculated, which indicates quantum entanglement in squeezing. 相似文献