排序方式: 共有62条查询结果,搜索用时 15 毫秒
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This paper presents a very simple scheme for generating quantum
controlled phase-shift gate with only one step by using the two
vibrational modes of a trapped ion as the two qubits. The scheme
couples two vibration degrees of freedom coupled with a suitable
chosen laser excitation via the ionic states. 相似文献
43.
In this paper,we investigate the entanglement dynamics of a two-qubit entangled state coupled with its noisy environment,and plan to utilize weak measurement and quantum reversal measurement to study the entanglement dynamics under different decoherence channels in noninertial frames.Through the calculations and analyses,it is shown that the weak measurement can prevent entanglement from coupling to the amplitude damping channel,while the system is under the phase damping and flip channels.This protection protocol cannot prevent entanglement but will accelerate the death of entanglement.In addition,if the system is in the noninertial reference frame,then the effect of weak measurement will be weakened for the amplitude damping channel.Nevertheless,for other decoherence channels,the Unruh effect does not affect the quantum weak measurement,the only exception is that the maximum value of entanglement is reduced to√2/2of the original value in the inertial frames. 相似文献
44.
We propose two schemes for teleporting an unknown state. In our schemes, a three-particle Greenberger-Horne-Zeilinger state is used as a quantum channel. We show that the probabilistic teleportation of an unknown quantum state can be realized. 相似文献
45.
This paper presents a very simple method to derive the explicit
transformations of the optimal economical 1 to M phase-covariant
cloning. The fidelity of clones reaches the theoretic bound
[D'Ariano G M and Macchiavello C 2003 Phys. Rev. A 67
042306]. The derived transformations cover the previous
contributions [Delgado Y, Lamata L et al, 2007 Phys. Rev.
Lett.98 150502] in which M must be odd. 相似文献
46.
在腔QED中实现最优非对称经济型1到3的相位协变克隆方案 总被引:1,自引:1,他引:0
本文提出一个在腔QED中实验上可行的方案来实现最优非对称经济型1到3相位协变克隆,这种克隆是不需要辅助粒子的。在这个的方案中,三个原子中的两个同时与腔场发生作用,并且它们受经典场的作用。并且此方案不受腔场的态和腔衰变的影响,因此,在实验上是可能实现的。 相似文献
47.
Scheme to implement optimal asymmetric economical 1→3 phase-covariant telecloning via cavity QED 下载免费PDF全文
<正>We propose an experimentally feasible scheme to implement the optimal asymmetric economical 1→3 phase-covariant telecloning protocol,which works without ancilla,based on cavity quantum electrodynamics(QED).The scheme is insensitive to the cavity field states and the cavity decay.In the telecloning process,the cavity is only virtually excited,it greatly prolongs the efficient decoherent time.Therefore,the scheme may be experimentally realized in the field of current cavity QED techniques. 相似文献
48.
A nearly deterministic scheme for generation of multiphoton GHZ states with weak cross-Kerr nonlinearity 下载免费PDF全文
We propose a scheme to generate polarization-entangled multiphoton Greenberger-Horne-Zeilinger (GHZ) states based on weak cross-Kerr nonlinearity and subsequent homodyne measurement. It can also be generalized to produce maximally N-qubit entangled states. The success probabilities of our schemes are almost equal to 1. 相似文献
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50.
In this paper, the monogamy properties of some quantum correlations, including the geometric quantum discord, concurrence, entanglement of formation and entropy quantum discord, in the anisotropic spin-1/2 XY model with stag- gered Dzyaloshinskii-Moriya (DM) interaction have been investigated using the quantum renormalization group (QRG) method. We summarize the monogamy relation for different quantum correlation measures and make an explicit compar- ison. Through mathematical calculations and analysis, we obtain that no matter whether the QRG steps are carried out, the monogamy of the given states are always unaltered. Moreover, we conclude that the geometric quantum discord and concurrence obey the monogamy property while other quantum correlation measures, such as entanglement of formation and quantum discord, violate it for this given model. 相似文献