Optimised photonic crystal waveguide for chiral light–matter interactions

Lang, Ben; Oulton, Ruth; Beggs, Daryl M.

doi:10.1088/2040-8986/aa5f5f

Cited by 24 publications

(17 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is, however, a small region of the design space where we find significant enhancements of the LDOS near (D1, D2) = (-0.11, 0.15)a. In this design there exists a C-point at frequency 0.2791c/a and position (x, y) = (0.50, 1.17)a from the origin that we calculate has an LDOS 8.6 times higher than any C-point in a standard W1 waveguide [22].…”

Section: Searching For Optimised Designsmentioning

confidence: 77%

Optimised chiral light-matter interactions at polarisation singularities for quantum photonics

Beggs

Lang

Oulton

2017

2017 19th International Conference on Transparent Optical Networks (ICTON)

Self Cite

View full text Add to dashboard Cite

Photonic crystal waveguides support chiral-point polarisation singularities which give rise to local chirality even in the absence of a global chiral symmetry. Placing a quantum dot at such a C-point gives rise to a unidirectional emission dependent on the electron spinideal for applications in quantum information as it entangles the spin direction of electrons on the quantum dot (static qubits) to the path in the waveguide (flying qubits). Here we discuss the optimisation of this chiral light-matter interaction using slow-light waveguides, and show designs with 8.6 times enhancement of the local density of optical states at a C-point.

show abstract

Section: Searching For Optimised Designsmentioning

confidence: 77%

Optimised chiral light-matter interactions at polarisation singularities for quantum photonics

Beggs

Lang

Oulton

2017

2017 19th International Conference on Transparent Optical Networks (ICTON)

Self Cite

View full text Add to dashboard Cite

show abstract

“…The emitters are initially prepared in the product state (|↑⟩ + |↓⟩)(|↑⟩ + |↓⟩)/2, and embedded in a waveguide Mach-Zehnder interferometer at c-points, where perfect correlation between propagation direction and circular polarisation occurs [14]. Consequently, the emitters scatter circularly polarised light only in the forward direction, as was demonstrated recently using semiconductor quantum dots under an ap-plied magnetic field [15][16][17][18]. For a lossless waveguide, the emitter will impart a π-phase shift to each photon that is on resonance with the transition [19][20][21][22].…”

Section: Takedownmentioning

confidence: 99%

Generating Maximal Entanglement between Spectrally Distinct Solid-State Emitters

Joanesarson

Hurst

Iles-Smith

et al. 2019

2019 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

View full text Add to dashboard Cite

We show how to create maximal entanglement between spectrally distinct solid-state emitters embedded in a waveguide interferometer. By revealing the rich underlying structure of multi-photon scattering in emitters, we show that a two-photon input state can generate deterministic maximal entanglement even for emitters with significantly different transition energies and line-widths. The optimal frequency of the input is determined by two competing processes: which-path erasure and interaction strength. We find that smaller spectral overlap can be overcome with higher photon numbers, and quasi-monochromatic photons are optimal for entanglement generation. Our work provides a new methodology for solid-state entanglement generation, where the requirement for perfectly matched emitters can be relaxed in favour of optical state optimisation.

show abstract

“…In figure 2(a) we assess a typical photonic crystal waveguide mode with wavevector k x = 0.395(2π/a), for lattice constant a [23]. The hole radii/slab height are r = 0.3a and h = 0.6a respectively [24]. The polarisation varies spatially, such that a circular dipole is strongly directional (|D| ≥ 0.9) over small areas as indicated by the darkest shading.…”

mentioning

confidence: 99%

Perfect Chirality with Imperfect Polarization

et al. 2022

Self Cite

View full text Add to dashboard Cite

Unidirectional (chiral) emission of light from a circular dipole emitter into a waveguide is only possible at points of perfect circular polarisation (C points), with elliptical polarisations yielding a lower directional contrast. However, there is no need to restrict engineered systems to circular dipoles, and with an appropriate choice of dipole unidirectional emission is possible for any elliptical polarization. Using elliptical dipoles, rather than circular, typically increases the size of the area suitable for chiral interactions (in an exemplary mode by a factor ∼ 30), while simultaneously increasing coupling efficiencies. We propose illustrative schemes to engineer the necessary elliptical transitions in both atomic systems and quantum dots.

show abstract

Optimised photonic crystal waveguide for chiral light–matter interactions

Abstract: We present slow-light photonic crystal waveguide designs that provide a ×8.6 improvement of the local density of optical states at a fully chiral point over previous designs.

Cited by 24 publications

References 26 publications

Optimised chiral light-matter interactions at polarisation singularities for quantum photonics

Optimised chiral light-matter interactions at polarisation singularities for quantum photonics

Generating Maximal Entanglement between Spectrally Distinct Solid-State Emitters

Perfect Chirality with Imperfect Polarization

Contact Info

Product

Resources

About