排序方式: 共有98条查询结果,搜索用时 203 毫秒
21.
A-Peng Liu 《中国物理 B》2022,31(8):80307-080307
We propose schemes of direct concurrence measurement for two-qubit phononic states from quantized mechanical vibration. By combining the Mach-Zehnder interferometer with the optomechanical cross-Kerr nonlinear effect, direct concurrence measurement schemes for two-qubit phononic entangled states are achieved with the help of photon detection with respect to the output of the interferometer. For different types of entangled states, diversified quantum devices and operations are designed accordingly. The final analysis shows reasonable performance under the current parameter conditions. Our schemes may be useful for potential phonon-based quantum computation and information in the future. 相似文献
22.
Deterministic implementations of fermionic quantum SWAP and Fredkin gates for spin qubits based on charge detection 下载免费PDF全文
We propose a scheme to implement fermionic quantum SWAP and Fredkin gates for spin qubits with the aid of charge detection. The scheme is deterministic without the need of qubit–qubit interaction, and the proposed setups consist of simple polarizing beam splitters, single-spin rotations, and charge detectors. Compared with linear optics quantum computation, this charge-measurement-based qubit scheme greatly enhances the success probability for im- plementing quantum SWAP and Fredkin gates and greatly simplifies the experimental realization of scalable quantum computers with noninteracting electrons. 相似文献
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Implementation of n-qubit Deutsch--Jozsa algorithm using resonant interaction in cavity QED 下载免费PDF全文
We propose a scheme to implement the n-qubit Deutsch--Jozsa
algorithm based on resonant interaction between the atoms and a
single-mode cavity. In the scheme, the resonant transitions between
two ground states and one excited state of an atom are changed
alternately by adjusting the cavity frequency appropriately, and the
operations required to complete the algorithm can be significantly
simplified following the increment of the number of qubits. The
implementation of the scheme in experiment would show the full power
of quantum algorithm and would be significative and important for
more complicated quantum algorithm in cavity quantum electrodynamics. 相似文献
26.
本文研究了具有不同耦合系数的两个二能级原子与双模腔场相互作用系统中原子偶极振幅平方压缩随时间的演化规律.并讨论了两个原子与双模腔场的相对耦合常数(R=g1/g2)和腔场的初态对原子偶极振幅平方压缩的影响. 相似文献
27.
We study the effect of Kerr medium on the intrinsic decoherence of a system which consists of two two-level atoms and a optical cavity. The entanglement of the system is calculated by making use of concurrence. Our results show that the intrinsic decoherence is very sensitive to the nonlinear coupling constant of Kerr medium. Both the oscillation period and the amplitude of the concurrence increase with the increasing nonlinear coupling constant. 相似文献
28.
与非等同双原子相互作用下光场的量子特性 总被引:1,自引:0,他引:1
研究了具有不同偶极矩的两个原子与双模压缩真空场相互作用系统中光场的量子特性.讨论了两个原子与双模压缩真空场的相对耦合常数(R=g1/g2)和光场的初始压缩因子r对光场的压缩效应和光子的聚束与反聚束效应的影响.数值计算结果表明,光场量子涨落的震荡幅度、最大压缩深度、压缩时间及二阶相干度的震荡振幅与光场的初始压缩因子r的大小有关.两原子与双模光场的相对耦合常数R影响着光场量子涨落和二阶相干度的震荡规律,因而也影响着压缩时间、光场处于非经典态的时间及光子的反聚束程度,但对光场的压缩深度无明显影响. 相似文献
29.
The influences of dipole--dipole interaction and detuning on the sudden death of entanglement between two atoms in the Tavis--Cummings model 下载免费PDF全文
The influences of dipole--dipole interaction and detuning on the
entanglement between two atoms with different initial tripartite
entangled W-like states in the Tavis--Cummings model have been
investigated by means of Wootters' concurrence, respectively. The
results show that the entanglement between the two atoms can be
enhanced via appropriately tuning the strength of dipole--dipole
interaction of two atoms or the detunings between atom and cavity,
and the so-called sudden death effect can be weakened
simultaneously. 相似文献
30.
This paper proposes a scheme to generate a new χ-type four-atom
entangled state for the first time by using linear optics elements,
four one-sided cavities (one three-level atom) and a conventional
photon detector. The linear optical elements and conventional photon
detector are simple and accessible in experiments, which makes the
scheme more feasible with current technology. In addition, the
state |χ003214 with probability 1 can be generated
as long as there is no photon loss. 相似文献