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arXiv 2002.03345quant-phcond-mat.mes-hallphysics.optics
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低频LC电路与大质量机械膜之间的稳态量子纠缠

Stationary quantum entanglement between a massive mechanical membrane and a low frequency LC circuit

Jie Li, Simon Gröblacher

摘要:

我们研究了一个系统中的机电纠缠,其中一个巨大的膜是电容耦合到{ \it低频} LC谐振器。在光-和电-力学中,兆赫(MHz)机械谐振器和千兆赫(GHz)微波LC谐振器之间的纠缠已经被广泛和充分地探索,并且最近实验证明。通常,耦合是通过类似辐射压力的相互作用来实现的,并且通过采用适当的微波驱动来产生纠缠。然而,通过这种方法,在机械振荡器和LC振荡器都是低频的情况下如何产生纠缠并不明显,例如,大约1 MHz。在这里,我们提供了一种有效的方法来纠缠两个低频谐振器进一步耦合膜的光学腔。该腔由红色失谐激光器强烈驱动,依次冷却机械和电模式,这导致在实验可达到的温度下的静态机电纠缠。纠缠直接源于机电耦合本身,并且由于其量子性质,将允许在比目前可能的更宏观的尺度上测试量子理论。

英文摘要:

We study electro-mechanical entanglement in a system where a massive membrane is capacitively coupled to a {\it low frequency} LC resonator. In opto- and electro-mechanics, the entanglement between a megahertz (MHz) mechanical resonator and a gigahertz (GHz) microwave LC resonator has been widely and well explored, and recently experimentally demonstrated. Typically, coupling is realized through a radiation pressure-like interaction, and entanglement is generated by adopting an appropriate microwave drive. Through this approach it is however not evident how to create entanglement in the case where both the mechanical and LC oscillators are of low frequency, e.g., around 1 MHz. Here we provide an effective approach to entangling two low-frequency resonators by further coupling the membrane to an optical cavity. The cavity is strongly driven by a red-detuned laser, sequentially cooling the mechanical and electrical modes, which results in stationary electro-mechanical entanglement at experimentally achievable temperatures. The entanglement directly originates from the electro-mechanical coupling itself and due to its quantum nature will allow testing quantum theories at a more macroscopic scale than currently possible.

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