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: | 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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