Dr BEN LANG's Outputs (8)

Multipartite entanglement in a Josephson junction laser (2024)
Journal Article
Lang, B., & Armour, A. D. (2024). Multipartite entanglement in a Josephson junction laser. Physical Review A, 110(6), Article 062611. https://doi.org/10.1103/PhysRevA.110.062611

We analyze the entanglement in a model Josephson photonics system in which a dc voltage-biased Josephson junction couples a collection of cavity modes and populates them with microwave photons. Using an approximate quadratic Hamiltonian model, we stu... Read More about Multipartite entanglement in a Josephson junction laser.

Discrete time translation symmetry breaking in a Josephson junction laser (2023)
Journal Article
Lang, B., Morley, G. F., & Armour, A. D. (2023). Discrete time translation symmetry breaking in a Josephson junction laser. Physical review B: Condensed matter and materials physics, 107(14), Article 144509. https://doi.org/10.1103/PhysRevB.107.144509

A Josephson junction laser is realized when a microwave cavity is driven by a voltage-biased Josephson junction. Through the ac Josephson effect, a dc voltage generates a periodic drive that acts on the cavity and generates interactions between its m... Read More about Discrete time translation symmetry breaking in a Josephson junction laser.

Witnessing Bell violations through probabilistic negativity (2022)
Journal Article
Morris, B., Fiderer, L. J., Lang, B., & Goldwater, D. (2022). Witnessing Bell violations through probabilistic negativity. Physical Review A, 105(3), Article 032202. https://doi.org/10.1103/physreva.105.032202

Bell's theorem shows that no local hidden-variable model can explain the measurement statistics of a quantum system shared between two parties, thus ruling out a classical (local) understanding of nature. In this paper we demonstrate that by relaxing... Read More about Witnessing Bell violations through probabilistic negativity.

Perfect Chirality with Imperfect Polarization (2022)
Journal Article
Lang, B., McCutcheon, D. P., Harbord, E., Young, A. B., & Oulton, R. (2022). Perfect Chirality with Imperfect Polarization. Physical Review Letters, 128(7), Article 073602. https://doi.org/10.1103/physrevlett.128.073602

Unidirectional (chiral) emission of light from a circular dipole emitter into a waveguide is only possible at points of perfect circular polarization (C points), with elliptical polarizations yielding a lower directional contrast. However, there is n... Read More about Perfect Chirality with Imperfect Polarization.

Josephson photonics with simultaneous resonances (2021)
Journal Article
Wood, K., Armour, A. D., & Lang, B. (2021). Josephson photonics with simultaneous resonances. Physical Review B, 104(15), Article 155424. https://doi.org/10.1103/physrevb.104.155424

Inelastic Cooper pair tunneling across a voltage-biased Josephson junction in series with one or more microwave cavities can generate photons via resonant processes in which the energy lost by the Cooper pair matches that of the photon(s) produced. W... Read More about Josephson photonics with simultaneous resonances.

Multi-Photon Resonances in Josephson Junction-Cavity Circuits (2021)
Journal Article
Lang, B., & Armour, A. (2021). Multi-Photon Resonances in Josephson Junction-Cavity Circuits. New Journal of Physics, 23(3), Article 033021. https://doi.org/10.1088/1367-2630/abe483

We explore the dissipative dynamics of nonlinearly driven oscillator systems tuned to resonances where multiple excitations are generated. Such systems are readily realised in circuit QED systems combining Josephson junctions with a microwave cavity... Read More about Multi-Photon Resonances in Josephson Junction-Cavity Circuits.

Collectively enhanced chiral photon emission from an atomic array near a nanofiber (2020)
Journal Article
Jones, R., Buonaiuto, G., Lang, B., Lesanovsky, I., & Olmos, B. (2020). Collectively enhanced chiral photon emission from an atomic array near a nanofiber. Physical Review Letters, 124(9), Article 093601. https://doi.org/10.1103/physrevlett.124.093601

Emitter ensembles interact collectively with the radiation field. In the case of a one-dimensional array of atoms near a nanofiber, this collective light-matter interaction does not only lead to an increased photon coupling to the guided modes within... Read More about Collectively enhanced chiral photon emission from an atomic array near a nanofiber.

99% beta factor and directional coupling of quantum dots to fast light in photonic crystal waveguides determined by spectral imaging (2019)
Journal Article
Scarpelli, L., Lang, B., Masia, F., Beggs, D. M., Muljarov, E. A., Young, A. B., Oulton, R., Kamp, M., Höfling, S., Schneider, C., & Langbein, W. (2019). 99% beta factor and directional coupling of quantum dots to fast light in photonic crystal waveguides determined by spectral imaging. Physical Review B, 100(3), Article 035311. https://doi.org/10.1103/PhysRevB.100.035311

© 2019 American Physical Society. Spontaneous emission from excitonic transitions in InAs/GaAs quantum dots embedded in photonic crystal waveguides at 5 K into nonguided and guided modes is determined by direct spectral imaging. This enables measurem... Read More about 99% beta factor and directional coupling of quantum dots to fast light in photonic crystal waveguides determined by spectral imaging.