强耦合 regime 下单个量子点微腔系统中的光子反聚束效应

Photon antibunching from a single quantum-dot-microcavity system in the strong coupling regime.

作者信息

Press David, Götzinger Stephan, Reitzenstein Stephan, Hofmann Carolin, Löffler Andreas, Kamp Martin, Forchel Alfred, Yamamoto Yoshihisa

机构信息

Edward L. Ginzton Laboratory, Stanford University, Stanford, California 94305-4085, USA.

出版信息

Phys Rev Lett. 2007 Mar 16;98(11):117402. doi: 10.1103/PhysRevLett.98.117402.

DOI:10.1103/PhysRevLett.98.117402

PMID:17501092

Abstract

We observe antibunching in the photons emitted from a strongly coupled single quantum dot and pillar microcavity in resonance. When the quantum dot was spectrally detuned from the cavity mode, the cavity emission remained antibunched, and also anticorrelated from the quantum dot emission. Resonant pumping of the selected quantum dot via an excited state enabled these observations by eliminating the background emitters that are usually coupled to the cavity. This device demonstrates an on-demand single-photon source operating in the strong coupling regime, with a Purcell factor of 61+/-7 and quantum efficiency of 97%.

摘要

我们观察到，在共振状态下，强耦合单量子点与柱形微腔发射的光子呈现反聚束现象。当量子点与腔模在光谱上失谐时，腔发射仍保持反聚束，并且与量子点发射反相关。通过激发态对选定量子点进行共振泵浦，消除了通常与腔耦合的背景发射体，从而实现了这些观测。该器件展示了一种在强耦合 regime 下工作的按需单光子源，珀塞尔因子为 61±7，量子效率为 97%。（注：“regime”常见释义为“政权；管理制度；政体”等，这里结合语境似乎应理解为一种特定的物理“状态、 regime”等，但暂按原文保留。）