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1.
We propose a scheme to implement quantum state transfer in a hybrid circuit quantum electrodynarnics (QED) system which consists of a superconducting charge qubit, a flux qubit, and a transmission line resonator (TLR). It is shown that quantum state transfer between the charge qubit and the flux qubit can be realized by using the TLR as the data bus. 相似文献
2.
Decoherence Sensing of Entangled-Coherent-State Channels via Unambiguous Quantum State Filtering 下载免费PDF全文
Unambiguous quantum state filtering is applied to evaluation of the decoherence sensing of entangled quantum channels consisting of N-mode entangled coherent states. It is found that quantum entanglement can enhance the performance of decoherence sensing while the increase of the mode numbers in the entangled probe field can slightly improve the sensing performance only in the weak field regime. 相似文献
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4.
An analytic solution is presented for two trapped ions resonantly interacting with laser beams to the first red side-band of the centre-of-mass mode,in the Lamb-Dicke regime and under the rotating wave approximation.This shows the existence of correlative quantum collapses and revivals for the occupation of two atoms. 相似文献
5.
We study the information transfer and entanglement transfer in a system consisting of single trapped ions in cavities by the three-mode cross-Kerr-like interaction among the cavity field (photons), the centre-of-mass motion (phonons) and the internal state of the trapped ion in the Lamb-Dicke and large detuning regime. 相似文献
6.
文章研究与玻色-爱因斯坦凝聚体相互作用的量子光场的非红典特性,表明当光场初始处于相干态,原子初始处于数态时,量子光场在时间演化过程中表现出松光子统计。发现对任意的初始原子数态和寝光强度,量子8光场的动力学都有不具有光场正交分量的二阶压缩,但在一定条件下,可以表现出高阶压缩,我们详细研究了量子光场的四阶压缩特性,给出了四阶压缩的条件。 相似文献
7.
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. 相似文献
8.
We study exciton transfer dynamics in a trimer system by investigating excitation transfer probability (ETP). We calculate ETP in the zero-temperature limit and theoretically predict the environment-assisted quantum critical effect, in which ETP exhibits a sudden change at the critical point of quantum phase transition for the trimer. In particular, we find that the steady-state ETP can be observed in the presence of the environment interaction. 相似文献
9.
Quantum entanglement and quantum nonlocality of N-photon entangled states |\psiN m\rangle
=Cm[\cos\gamma|N-m\rangle1|m\rangle2 +\e{\i\θm}\sin\gamma|m\rangle1|N-m\rangle2] and their superpositions are studied. We point out that the relative
phase θm affects the quantum nonlocality but not the quantum
entanglement for the state |\psiN m\rangle. We show that
quantum nonlocality can be controlled and manipulated by adjusting
the state parameters of |\psiN m\rangle, superposition
coefficients, and the azimuthal angles of the Bell operator. We
also show that the violation of the Bell inequality can reach its
maximal value under certain conditions. It is found that quantum
superpositions based on |\psiN m\rangle can increase the
amount of entanglement, and give more ways to reach the maximal
violation of the Bell inequality. 相似文献
10.
In this paper, we present a linear optical scheme for optimal
unambiguous discrimination among nonorthogonal quantum states in
terms of the multiple-rail and polarization representation of a
single photon. In our scheme, discriminated quantum states are
expressed by using the spatial degree of freedom of a single photon
while the polarization degree of freedom of the single photon is
used to act as an auxiliary qubit. The optical components used in
our scheme are only passive linear optical elements such as
polarizing beam splitters, wave plates, polarizers, single photon
detectors, and single photon source. 相似文献