Polarization engineering in photonic crystal waveguides for spin-photon entanglers

Andrew Young, Arthur Thijssen, Daryl Beggs, Petros Androvitsaneas, L Kuipers, John Rarity, S Hughes, Ruth Oulton

Research output: Contribution to journalArticle (Academic Journal)peer-review

97 Citations (Scopus)
385 Downloads (Pure)


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 suppression of quantum interference prevents dipole induced reflection in the waveguide, and highlight a fundamental breakdown of the semiclassical dipole approximation for describing light-matter interactions in these spin dependent systems.
Original languageEnglish
Article number153901
Number of pages5
JournalPhysical Review Letters
Issue number15
Publication statusPublished - 9 Oct 2015


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