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arXiv quant-ph/9907074quant-ph
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噪声量子信道的无时间卷积约化密度算子理论:用于量子信息处理的二比特量子门

Time-convolutionless reduced-density-operator theory of a noisy quantum channel: a two-bit quantum gate for quantum information processing

D. Ahn, J. H. Oh, K. Kimm, S. W. Hwang

摘要:

利用投影算符方法和时间上的超前传播子和滞后传播子,通过求解控制噪声量子信道动力学的量子Liouville方程,导出了无时间卷积形式的量子量子态的精确约化密度算符.在这项工作中开发的形式主义是一般性的,足以模拟一个嘈杂的量子信道提供具体形式的哈密顿系统,水库,系统和水库之间的相互作用。然后,我们应用该公式模拟了一个由耦合自旋系统组成的二比特量子门,其中海森堡耦合由相邻量子点之间的隧穿势垒控制。数值计算了混合初态和纠缠初态的门特性,包括熵、保真度和纯度。

英文摘要:

An exact reduced-density-operator for the output quantum states in time-convolutionless form was derived by solving the quantum Liouville equation which governs the dynamics of a noisy quantum channel by using a projection operator method and both advanced and retarded propagators in time. The formalism developed in this work is general enough to model a noisy quantum channel provided specific forms of the Hamiltonians for the system, reservoir, and the mutual interaction between the system and the reservoir are given. Then, we apply the formulation to model a two-bit quantum gate composed of coupled spin systems in which the Heisenberg coupling is controlled by the tunneling barrier between neighboring quantum dots. Gate Characteristics including the entropy, fidelity, and purity are calculated numerically for both mixed and entangled initial states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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