Direct measurement of finite-time disentanglement induced by a reservoir
Direct measurement of finite-time disentanglement induced by a reservoir
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DOI：
10.1103/physreva.73.040305
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发表时间：
2005-09
影响因子：
2.9
通讯作者：
M. F. Santos;P. Milman;L. Davidovich;N. Zagury
中科院分区：
文献类型：
--
作者：
M. F. Santos;P. Milman;L. Davidovich;N. Zagury
我们提出了一种直接探测初始两量子比特纠缠态在库作用下的解缠动力学的方法。我们证明，对于实验上可实现的衰变系统的例子，通过测量在整个衰变过程中不变的单个可观测到的量，可以检测到解缠。所考虑的系统可能导致有限时间或渐近解缠。提出了测量这一可观测量的一般公式，对纠缠测量具有实际意义，并以腔量子电动力学和囚禁离子为例。
We propose a method for directly probing the dynamics of disentanglement of an initial two-qubit entangled state under the action of a reservoir. We show that it is possible to detect disentanglement, for experimentally realizable examples of decaying systems, through the measurement of a single observable, which is invariant throughout the decay. The systems under consideration may lead to either finite-time or asymptotic disentanglement. A general prescription for measuring this observable, which yields an operational meaning to entanglement measures, is proposed, and exemplified for cavity quantum electrodynamics and trapped ions.