Photon phase shift at the few-photon level and optical switching by a quantum dot in a microcavity

Wells, LM, Kalliakos, S, Villa, B, Ellis, DJP, Stevenson, RM, Bennett, Anthony ORCID: https://orcid.org/0000-0002-5386-3710, Farrer, I, Ritchie, DA and Shields, AJ 2019. Photon phase shift at the few-photon level and optical switching by a quantum dot in a microcavity. Physical Review Applied 11 (6) , -. 10.1103/PhysRevApplied.11.061001

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Abstract

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◦ 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	2331-7019
Related URLs:	https://arxiv.org/abs/1907.07991
Date of First Compliant Deposit:	5 August 2019
Last Modified:	05 May 2023 20:20
URI:	https://orca.cardiff.ac.uk/id/eprint/124666

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