Generating mechanical and optomechanical entanglement via pulsed interaction and measurement
Generating mechanical and optomechanical entanglement via pulsed interaction and measurement
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DOI：
10.1088/1367-2630/ab7ddd
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发表时间：
2020-06-01
影响因子：
3.3
通讯作者：
Vanner, M. R.
中科院分区：
文献类型：
--
作者：
Clarke, J.;Sahium, P.;Vanner, M. R.
宏观尺度的纠缠生成为开发新的量子技术和在桌面上研究基础物理提供了令人兴奋的途径。由于量子光学的精度与光机械设备的最新实验进展相结合，腔量子光机械为产生和利用这种现象提供了一个理想的平台。在这项工作中，我们提出了在解析边带范围之外运行的方案，以准备和验证光学机械纠缠和机械机械纠缠。我们的方案采用持续时间远小于机械周期的脉冲相互作用，并与零差测量一起，可以生成并表征这些类型的纠缠。为了提高我们方案的性能，可以利用包含先前脉冲的预冷却级来增加准备的纠缠量，并且可以使用局部光学压缩器来提供针对开放系统动力学的弹性。我们的方案产生的纠缠使用对数负性进行量化，并根据实际实验场景（包括机械退相干和光学损耗）的脉冲光机械相互作用的强度进行分析。介绍并比较了两种单独的机械纠缠生成方案：一种方案基于光学干涉设计，另一种方案包括顺序光机械相互作用。我们协议的脉冲性质可以更直接地访问时域中的这些量子相关性，其应用包括量子计量和量子退相干测试。通过考虑基于最近实验的参数集，即使在光学损耗较大的情况下，也证明了使用我们的方案产生显着纠缠的可行性。
Entanglement generation at a macroscopic scale offers an exciting avenue to develop new quantum technologies and study fundamental physics on a tabletop. Cavity quantum optomechanics provides an ideal platform to generate and exploit such phenomena owing to the precision of quantum optics combined with recent experimental advances in optomechanical devices. In this work, we propose schemes operating outside the resolved-sideband regime, to prepare and verify both optical-mechanical and mechanical-mechanical entanglement. Our schemes employ pulsed interactions with a duration much less than the mechanical period and, together with homodyne measurements, can both generate and characterize these types of entanglement. To improve the performance of our schemes, a precooling stage comprising prior pulses can be utilized to increase the amount of entanglement prepared, and local optical squeezers may be used to provide resilience against open-system dynamics. The entanglement generated by our schemes is quantified using the logarithmic negativity and is analysed with respect to the strength of the pulsed optomechanical interactions for realistic experimental scenarios including mechanical decoherence and optical loss. Two separate schemes for mechanical entanglement generation are introduced and compared: one scheme based on an optical interferometric design, and the other comprising sequential optomechanical interactions. The pulsed nature of our protocols provides more direct access to these quantum correlations in the time domain, with applications including quantum metrology and tests of quantum decoherence. By considering a parameter set based on recent experiments, the feasibility to generate significant entanglement with our schemes, even with large optical losses, is demonstrated.