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arXiv 0906.0751quant-ph
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纳米谐振腔与强耦合量子点的快速电学控制

Fast Electrical Control of a Quantum Dot Strongly Coupled to a Nano-resonator

Andrei Faraon, Arka Majumdar, Hyochul Kim, Pierre Petroff, Jelena Vuckovic

摘要:

利用量子限制Stark效应对GaAs光子晶体腔与InAs量子点强耦合的谐振频率进行了电控制。斯塔克位移高达0.3meV,实现了使用横向肖特基电极,在量子点的位置处创建一个本地耗尽区。我们报告切换的探测激光相干耦合到腔高达150 MHz的速度,由传输线的RC常数的限制。在相干探测系统的同时,研究了斯塔克位移与电场的耦合率和幅度。

英文摘要:

The resonance frequency of an InAs quantum dot strongly coupled to a GaAs photonic crystal cavity was electrically controlled via quantum confined Stark effect. Stark shifts up to 0.3meV were achieved using a lateral Schottky electrode that created a local depletion region at the location of the quantum dot. We report switching of a probe laser coherently coupled to the cavity up to speeds as high as 150MHz, limited by the RC constant of the transmission line. The coupling rate and the magnitude of the Stark shift with electric field were investigated while coherently probing the system.

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