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arXiv 1303.4976quant-phphysics.optics
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时间连续Bell测量

Time-Continuous Bell Measurements

Sebastian G. Hofer, Denis V. Vasilyev, Markus Aspelmeyer, Klemens Hammerer

摘要:

我们结合了贝尔测量的概念,其中两个系统被投射到一个最大的纠缠态,与连续测量的概念,这涉及到一个连续监测的量子系统的演变。对于这种时间连续的贝尔测量,我们推导出相应的随机薛定谔方程,以及无条件反馈主方程。我们的结果适用于广泛的物理系统,并很容易适应描述任意数量的系统和测量。因此,时间连续的贝尔测量为控制复杂的量子系统和网络提供了一种通用的工具。作为例子,我们表明,(i)两个两级系统可以确定性纠缠通过零差检测,容忍光子损失高达50%,和(ii)一个量子态的光可以连续传送到一个机械振荡器,它的工作条件下所需的光学机械基态冷却。

英文摘要:

We combine the concept of Bell measurements, in which two systems are projected into a maximally entangled state, with the concept of continuous measurements, which concerns the evolution of a continuously monitored quantum system. For such time-continuous Bell measurements we derive the corresponding stochastic Schrödinger equations, as well as the unconditional feedback master equations. Our results apply to a wide range of physical systems, and are easily adapted to describe an arbitrary number of systems and measurements. Time-continuous Bell measurements therefore provide a versatile tool for the control of complex quantum systems and networks. As examples we show show that (i) two two-level systems can be deterministically entangled via homodyne detection, tolerating photon loss up to 50%, and (ii) a quantum state of light can be continuously teleported to a mechanical oscillator, which works under the same conditions as are required for optomechanical ground state cooling.

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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