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Polarization engineering in photonic crystal waveguides for spin-photon entanglers

Young, A. B., Thijssen, A. C. T., Beggs, D. M., 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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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: 08 Apr 2020 17:00

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