Inducing micromechanical motion by optical excitation of a single quantum dot
Inducing micromechanical motion by optical excitation of a single quantum dot
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DOI：
10.1038/s41565-020-00814-y
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发表时间：
2020-12-21
影响因子：
38.3
通讯作者：
Poizat, Jean-Philippe
中科院分区：
文献类型：
--
作者：
Kettler, Jan;Vaish, Nitika;Poizat, Jean-Philippe
混合量子光学机械系统将单个两能级系统与宏观机械自由度连接。在具有单个嵌入式半导体量子点的微导线中，不仅导线振动可以调制激子跃迁能量，而且量子点的光学驱动还可以诱导导线中的运动。混合量子光机械系统（1）将宏观机械自由度与单个两能级系统（例如单个自旋（2-4））连接，超导量子位（5-7）或单个光发射器（8-12）。最近，在微波领域工作的混合系统取得了令人印象深刻的进展（13，14）。同时，只有少数实验方法成功地解决了光学领域的混合系统，表明宏观运动可以调制两能级系统的跃迁能量（9，10，15）。然而，对应于单个量子系统对宏观机械谐振器的反作用的互易效应仍然难以捉摸。与光学腔相比，二能级系统只需要一个能量量子。因此，与腔光学机械系统（1，16）相比，它需要更强的混合耦合率。在这里，我们建立在振荡微丝和单个嵌入式量子点之间的大应变耦合上（9）。我们使用在机械频率下调制的激光共振驱动量子点的激子。状态相关的应变，然后在一个时间相关的机械力，驱动微丝运动的结果。这个力几乎比光子通量与量子点相互作用产生的辐射压力大三个数量级。原则上，状态依赖力可以构成将量子点量子态相干编码到机械自由度上的策略（1）。
Hybrid quantum optomechanical systems interface a single two-level system with a macroscopic mechanical degree of freedom. In a microwire with a single embedded semiconductor quantum dot, not only can the wire vibration modulate the excitonic transition energy, but the optical drive of the quantum dot can also induce motion in the wire.Hybrid quantum optomechanical systems(1) interface a macroscopic mechanical degree of freedom with a single two-level system such as a single spin(2-4), a superconducting qubit(5-7) or a single optical emitter(8-12). Recently, hybrid systems operating in the microwave domain have witnessed impressive progress(13,14). Concurrently, only a few experimental approaches have successfully addressed hybrid systems in the optical domain, demonstrating that macroscopic motion can modulate the two-level system transition energy(9,10,15). However, the reciprocal effect, corresponding to the backaction of a single quantum system on a macroscopic mechanical resonator, has remained elusive. In contrast to an optical cavity, a two-level system operates with no more than a single energy quantum. Hence, it requires a much stronger hybrid coupling rate compared to cavity optomechanical systems(1,16). Here, we build on the large strain coupling between an oscillating microwire and a single embedded quantum dot(9). We resonantly drive the quantum dot's exciton using a laser modulated at the mechanical frequency. State-dependent strain then results in a time-dependent mechanical force that actuates microwire motion. This force is almost three orders of magnitude larger than the radiation pressure produced by the photon flux interacting with the quantum dot. In principle, the state-dependent force could constitute a strategy to coherently encode the quantum dot quantum state onto a mechanical degree of freedom(1).