Photon Phase Shift at the Few-Photon Level and Optical Switching by a Quantum Dot in a Microcavity

被引：16
|
作者：
Wells, L. M. [1 ,2 ]
Kalliakos, S. [1 ]
Villa, B. [1 ,2 ]
Ellis, D. J. P. [1 ]
Stevenson, R. M. [1 ]
Bennett, A. J. [1 ,3 ]
Farrer, I. [2 ,4 ]
Ritchie, D. A. [2 ]
Shields, A. J. [1 ]
机构：
[1] Toshiba Res Europe Ltd, Cambridge Res Lab, 208 Sci Pk,Milton Rd, Cambridge CB4 0GZ, England
[2] Univ Cambridge, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England
[3] Cardiff Univ, Inst Compound Semicond, Queens Bldg,5 Parade, Cardiff CF24 3AA, S Glam, Wales
[4] Univ Sheffield, Dept Elect & Elect Engn, Mappin St, Sheffield S1 3JD, S Yorkshire, England
来源：
PHYSICAL REVIEW APPLIED | 2019年 / 11卷 / 06期
基金：
英国工程与自然科学研究理事会; 欧盟地平线“2020”;
关键词：
SINGLE-ELECTRON; SPIN; ELECTRODYNAMICS; ROTATION;
D O I：
10.1103/PhysRevApplied.11.061001
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We exploit the nonlinearity arising from the spin-photon interaction in an InAs quantum dot to demonstrate phase shifts of scattered light pulses at the single-photon level. Photon phase shifts of close to 90 degrees are achieved using a charged quantum dot in a micropillar cavity. We also demonstrate a photon phase switch by using a spin-pumping mechanism through Raman transitions in an in-plane magnetic field. The experimental findings are supported by a theoretical model that explores the dynamics of the system. Our results demonstrate the potential of quantum-dot-induced nonlinearities for quantum information processing.
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收藏
页数：6
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