Polarization engineering in photonic crystal waveguides for spin-photon entanglers

Young, A. B., Thijssen, A. C. T., Beggs, D. M. ORCID: https://orcid.org/0000-0002-2231-7514, Androvitsaneas, P., Kuipers, L., Rarity, J. G., Hughes, S. and Oulton, R. 2015. Polarization engineering in photonic crystal waveguides for spin-photon entanglers. Physical Review Letters 115 , 153901. 10.1103/PhysRevLett.115.153901

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Abstract

By performing a full analysis of the projected local density of states (LDOS) in a photonic crystal waveguide, we show that phase plays a crucial role in the symmetry of the light-matter interaction. By considering a quantum dot (QD) spin coupled to a photonic crystal waveguide (PCW) mode, we demonstrate that the light-matter interaction can be asymmetric, leading to unidirectional emission and a deterministic entangled photon source. Further we show that understanding the phase associated with both the LDOS and the QD spin is essential for a range of devices that that can be realised with a QD in a PCW. We also show how quantum entanglement can completely reverse photon propagation direction, and highlight a fundamental breakdown of the semiclassical dipole approximation for describing light-matter interactions in these spin dependent systems.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	American Physical Society
ISSN:	0031-9007
Date of First Compliant Deposit:	8 April 2020
Last Modified:	04 May 2023 23:16
URI:	https://orca.cardiff.ac.uk/id/eprint/94333

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