title: Polarization Engineering in Photonic Crystal Waveguides for Spin-Photon Entanglers.
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 can be realized 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.
authors.affiliation: Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, United Kingdom.
authors.forename: A B
authors.initials: AB
authors.lastname: Young
authors.affiliation: Centre for Quantum Photonics, H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom.
authors.forename: A C T
authors.initials: AC
authors.lastname: Thijssen
authors.affiliation: Centre for Quantum Photonics, H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom.
authors.forename: D M
authors.initials: DM
authors.lastname: Beggs
authors.affiliation: Centre for Quantum Photonics, H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: Androvitsaneas
authors.affiliation: Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, Netherlands.
authors.forename: L
authors.initials: L
authors.lastname: Kuipers
authors.affiliation: Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, United Kingdom.
authors.forename: J G
authors.initials: JG
authors.lastname: Rarity
authors.affiliation: Department of Physics, Queen's University, Ontario, Canada K7L 3N6.
authors.forename: S
authors.initials: S
authors.lastname: Hughes
authors.affiliation: Department of Electrical and Electronic Engineering, University of Bristol, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, United Kingdom.|Centre for Quantum Photonics, H.H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom.
authors.forename: R
authors.initials: R
authors.lastname: Oulton