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arXiv 0903.3464quant-phcond-mat.mes-hall
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受驱动耦合量子比特系统中纠缠的产生和传播

Generation and propagation of entanglement in driven coupled-qubit systems

Jian Li, G. S. Paraoanu

摘要:

在一个二分系统中,受到来自两个独立的水库的退相干,纠缠通常比单个水库更快地被破坏。然而,令人惊讶的是,单独的水库的存在也可以有一个有益的纠缠效应:如果量子比特耦合和驱动外部的经典场,系统最终在一个稳定的状态,其特征是有限程度的纠缠。这种现象只发生在参数空间的某个区域,并且定态的结构具有不依赖于初始状态或量子比特的特定物理实现的普遍形式。我们表明,由此产生的纠缠可以在量子网络中使用简单的本地幺正操作进行传播。我们建议在量子线路中使用这种系统作为“纠缠电池”。

英文摘要:

In a bipartite system subject to decoherence from two separate reservoirs, the entanglement is typically destroyed faster than for single reservoirs. Surprisingly however, the existence of separate reservoirs can also have a beneficial entangling effect: if the qubits are coupled and driven externally by a classical field, the system ends up in a stationary state characterized by a finite degree of entanglement. This phenomenon occurs only in a certain region of the parameter space and the structure of the stationary state has a universal form which does not depend on the initial state or on the specific physical realization of the qubits. We show that the entanglement thus generated can be propagated within a quantum network using simple local unitary operations. We suggest the use of such systems as "batteries of entanglement" in quantum circuits.

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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