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  • Conference paper
    Schofield RC, Boissier S, Jin L, Ovvyan A, Nur S, Koppens FHL, Toninelli C, Pernice WHP, Major KD, Hinds EA, Clark ASet al., 2021,

    Coupling a single molecule to an interrupted nanophotonic waveguide
  • Conference paper
    Enzian G, Freisem L, Price JJ, Svela A, Clarke J, Shajilal B, Janousek J, Buchler BC, Lam PK, Vanner MRet al., 2021,

    Single- and Multi-Phonon Subtraction to a Mechanical Thermal State via Optomechanics

    We perform single- and multi-phonon subtraction to a mechanical thermal state in a Brillouin optomechanical system. An increase in the mean mechanical occupation and non-Gaussianity in the s-parameterised Wigner phase-space distribution is observed.
  • Conference paper
    Sempere-Llagostera S, Thekkadath GS, Patel RB, Kolthammer WS, Walmsley IAet al., 2021,

    Reducing g<sup>(2)</sup>(0) of a Parametric Down-Conversion Source via Photon-Number Resolution with Superconducting Nanowire Detectors

    We demonstrate a 13±0.4% reduction of the second-order correlation function g(2)(0) by harnessing the photon-number resolving capabilities of commercial superconducting nanowire single-photon detectors, improving the quality of a heralded single-photon source.
  • Conference paper
    Schofield RC, Boissier S, Jin L, Ovvyan A, Nur S, Koppens FHL, Toninelli C, Pernice WHP, Major KD, Hinds EA, Clark ASet al., 2021,

    Adapted operating fault model for a heat pump life cycle's simulation by Petri net approach

    , Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
  • Conference paper
    Burdekin P, Grandi S, Newbold R, Hoggarth RA, Major KD, Hinds EA, Clark ASet al., 2021,

    Spectroscopy of rubidium with a tuneable single photon source
  • Conference paper
    Schofield RC, Boissier S, Jin L, Ovvyan A, Nur S, Koppens FHL, Toninelli C, Pernice WHP, Major KD, Hinds EA, Clark ASet al., 2021,

    Coupling a single molecule to an interrupted nanophotonic waveguide
  • Journal article
    Kim MS, 2021,

    A massive test

    , NATURE PHYSICS, Vol: 17, Pages: 14-15, ISSN: 1745-2473
  • Conference paper
    Svela AO, Silver JM, Del Bino L, Zhang S, Woodley MTM, Vanner MR, Del'Haye Pet al., 2021,

    &gt;30 dB Suppression of Intrinsic Backscattering in Whispering-Gallery-Mode Microresonators

    , Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
  • Conference paper
    Fasoulakis A, Major KD, Hoggarth RA, Clark ASet al., 2021,

    Strain tuning of single-molecule-based single photon sources

    , Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
  • Conference paper
    Svela AO, Silver JM, Del Bino L, Zhang S, Woodley MTM, Vanner MR, Del'Haye Pet al., 2021,

    More Than 34 dB Backscattering Suppression in Microresonators

    , Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
  • Conference paper
    Burdekin P, Grandi S, Newbold R, Hoggarth RA, Major KD, Hinds EA, Clark ASet al., 2021,

    Spectroscopy of Rubidium with a Tuneable Single Photon Source

    , Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
  • Conference paper
    Alexander O, Barillot T, Cooper B, Driver T, Garratt D, Li S, Marinelli A, Cryan JP, Marangos JPet al., 2021,

    Inner Valence Hole Migration in Isopropanol

    , Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
  • Conference paper
    Enzian G, Price JJ, Freisem L, Szczykulska M, Nunn J, Walmsley IA, Silver J, Del Bino L, Zhang S, Del'Haye P, Janousek J, Buchler BC, Lam PK, Vanner MRet al., 2021,

    Brillouin optomechanics in whispering-gallery-mode microresonators: From strong coupling to single-phonon addition and subtraction

    , Conference on Lasers and Electro-Optics (CLEO), Publisher: IEEE, ISSN: 2160-9020
  • Journal article
    Svela AO, Silver JM, Del Bino L, Zhang S, Woodley MTM, Vanner MR, Del'Haye Pet al., 2020,

    Coherent suppression of backscattering in optical microresonators

    , LIGHT-SCIENCE & APPLICATIONS, Vol: 9, ISSN: 2047-7538
  • Journal article
    Sauvage F, Mintert F, 2020,

    Optimal Quantum Control with Poor Statistics

    , PRX QUANTUM, Vol: 1
  • Journal article
    Zhang W-H, Liu X, Yin P, Peng X-X, Li G-C, Xu X-Y, Yu S, Hou Z-B, Han Y-J, Xu J-S, Zhou Z-Q, Chen G, Li C-F, Guo G-Cet al., 2020,

    Classical communication enhanced quantum state verification

    , NPJ QUANTUM INFORMATION, Vol: 6
  • Journal article
    Martinetz L, Hornberger K, Millen J, Kim MS, Stickler BAet al., 2020,

    Quantum electromechanics with levitated nanoparticles

    , npj Quantum Information, Vol: 6, ISSN: 2056-6387

    Preparing and observing quantum states of nanoscale particles is a challenging task with great relevance for quantum technologies and tests of fundamental physics. In contrast to atomic systems with discrete transitions, nanoparticles exhibit a practically continuous absorption spectrum and thus their quantum dynamics cannot be easily manipulated. Here, we demonstrate that charged nanoscale dielectrics can be artificially endowed with a discrete level structure by coherently interfacing their rotational and translational motion with a superconducting qubit. We propose a pulsed scheme for the generation and read-out of motional quantum superpositions and entanglement between several levitated nanoparticles, providing an all-electric platform for networked hybrid quantum devices.
  • Journal article
    Yu S, Meng Y, Tang J-S, Xu X-Y, Wang Y-T, Yin P, Ke Z-J, Liu W, Li Z-P, Yang Y-Z, Chen G, Han Y-J, Li C-F, Guo G-Cet al., 2020,

    Experimental Investigation of Quantum <i>PT</i>-Enhanced Sensor

    , PHYSICAL REVIEW LETTERS, Vol: 125, ISSN: 0031-9007
  • Journal article
    Paige AJ, Kwon H, Simsek S, Self CN, Gray J, Kim MSet al., 2020,

    Quantum delocalized interactions

    , Physical Review Letters, Vol: 125, Pages: 240406 – 1-240406 – 6, ISSN: 0031-9007

    Classical mechanics obeys the intuitive logic that a physical event happens at a definite spatial point. Entanglement, however, breaks this logic by enabling interactions without a specific location. In this work we study these delocalized interactions. These are quantum interactions that create less locational information than would be possible classically, as captured by the disturbance induced on some spatial superposition state. We introduce quantum games to capture the effect and demonstrate a direct operational use for quantum concurrence in that it bounds the nonclassical performance gain. We also find a connection with quantum teleportation, and demonstrate the games using an IBM quantum processor.
  • Journal article
    Drahi D, Walk N, Hoban MJ, Fedorov AK, Shakhovoy R, Feimov A, Kurochkin Y, Kolthammer WS, Nunn J, Barrett J, Walmsley IAet al., 2020,

    Certified Quantum Random Numbers from Untrusted Light

    , PHYSICAL REVIEW X, Vol: 10, ISSN: 2160-3308
  • Journal article
    Enzian G, Price J, Freisem L, Nunn J, Janousek J, Buchler B, Lam PK, Vanner Met al., 2020,

    Single-phonon addition and subtraction to a mechanical thermal state

    , Physical Review Letters, ISSN: 0031-9007
  • Journal article
    Caldwell L, Tarbutt MR, 2020,

    Enhancing dipolar interactions between molecules using state-dependent optical tweezer traps

    , Physical Review Letters, Vol: 125, Pages: 243201 – 1-243201 – 6, ISSN: 0031-9007

    We show how state-dependent optical potentials can be used to trap a pair of molecules in different internal states at a separation much smaller than the wavelength of the trapping light. This close spacing greatly enhances thedipole-dipole interaction and we show how it can be used to implement two-qubit gates between molecules that are 100 times faster than existing protocols and than rotational coherence times already demonstrated. We analyze complications due to hyperfine structure, tensor light shifts, photon scattering and collisional loss, and conclude that none is a barrier to implementing the scheme.
  • Journal article
    Jia Z-A, Zhai R, Yu S, Wu Y-C, Guo G-Cet al., 2020,

    Hierarchy of genuine multipartite quantum correlations

    , Quantum Information Processing, Vol: 19, ISSN: 1570-0755
  • Journal article
    Dhar HS, Rodrigues JD, Walker BT, Oulton RF, Nyman RA, Mintert Fet al., 2020,

    Transport and localization of light inside a dye-filled microcavity

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 102, Pages: 1-9, ISSN: 1050-2947

    The driven-dissipative nature of light-matter interaction inside a multimode, dye-filled microcavity makes it an ideal system to study nonequilibrium phenomena, such as transport. In this work, we investigate how light is efficiently transported inside such a microcavity, mediated by incoherent absorption and emission processes. In particular, we show that there exist two distinct regimes of transport, viz. conductive and localized, arising from the complex interplay between the thermalizing effect of the dye molecules and the nonequilibrium influence of driving and loss. The propagation of light in the conductive regime occurs when several localized cavity modes undergo dynamical phase transitions to a condensed, or lasing, state. Furthermore, we observe that, while such transport is robust for weak disorder in the cavity potential, strong disorder can lead to localization of light even under good thermalizing conditions. Importantly, the exhibited transport and localization of light is a manifestation of the nonequilibrium dynamics rather than any coherent interference in the system.
  • Journal article
    Oh C, Kwon H, Jiang L, Kim MSet al., 2020,

    Field-gradient measurement using a Stern-Gerlach atomic interferometer with butterfly geometry

    , Physical Review A: Atomic, Molecular and Optical Physics, Vol: 102, Pages: 053321 – 1-053321 – 8, ISSN: 1050-2947

    Atomic interferometers have been studied as a promising device for precise sensing of external fields. Among various configurations, a particular configuration with a butterfly-shaped geometry has been designed to sensitively probe field gradients. We introduce a Stern-Gerlach (SG) butterfly interferometer by incorporating magnetic field in the conventional butterfly-shaped configuration. Atomic trajectories of the interferometer can be flexibly adjusted by controlling magnetic fields to increase the sensitivity of the interferometer, while the conventional butterfly interferometer using Raman transitions can be understood as a special case. We also show that the SG interferometer can keep high contrast against a misalignment in position and momentum caused by the field gradient.
  • Journal article
    Jennings D, Cirstoiu C, Korzekwa K, 2020,

    Robustness of Noether's principle: maximal disconnects between conservation laws and symmetries in quantum theory

    , Physical Review X, Vol: 10, Pages: 041035 – 1-041035 – 41, ISSN: 2160-3308

    To what extent does Noether’s principle apply to quantum channels? Here, we quantify the degreeto which imposing a symmetry constraint on quantum channels implies a conservation law, and showthat this relates to physically impossible transformations in quantum theory, such as time-reversaland spin-inversion. In this analysis, the convex structure and extremal points of the set of quantumchannels symmetric under the action of a Lie group G becomes essential. It allows us to derivebounds on the deviation from conservation laws under any symmetric quantum channel in terms ofthe deviation from closed dynamics as measured by the unitarity of the channel E. In particular,we investigate in detail the U(1) and SU(2) symmetries related to energy and angular momentumconservation laws. In the latter case, we provide fundamental limits on how much a spin-jA systemcan be used to polarise a larger spin-jB system, and on how much one can invert spin polarisationusing a rotationally-symmetric operation. Finally, we also establish novel links between unitarity,complementary channels and purity that are of independent interest.
  • Journal article
    Mukherjee R, Xie H, Mintert F, 2020,

    Bayesian Optimal Control of Greenberger-Horne-Zeilinger States in Rydberg Lattices

    , PHYSICAL REVIEW LETTERS, Vol: 125, ISSN: 0031-9007
  • Journal article
    Wan KH, Neville A, Kolthammer WS, 2020,

    Memory-assisted decoder for approximate Gottesman-Kitaev-Preskill codes

    , Physical Review Research, Vol: 2, ISSN: 2643-1564

    We propose a quantum error correction protocol for continuous-variable finite-energy, approximate Gottesman-Kitaev-Preskill (GKP) states undergoing small Gaussian random displacement errors, based on the scheme of Glancy and Knill [Phys. Rev. A 73, 012325 (2006)]. We show that combining multiple rounds of error-syndrome extraction with Bayesian estimation offers enhanced protection of GKP-encoded qubits over comparible single-round approaches. Furthermore, we show that the expected total displacement error incurred in multiple rounds of error followed by syndrome extraction is bounded by 2√π. By recompiling the syndrome-extraction circuits, we show that all squeezing operations can be subsumed into auxiliary state preparation, reducing them to beamsplitter transformations and quadrature measurements.
  • Journal article
    Holmes Z, Mintert F, Anders J, 2020,

    Gibbs mixing of partially distinguishable photons with a polarising beamsplitter membrane

    , NEW JOURNAL OF PHYSICS, Vol: 22, ISSN: 1367-2630
  • Journal article
    Meng Y, Yu S, Jia Z-A, Wang Y-T, Ke Z-J, Liu W, Li Z-P, Yang Y-Z, Wang H, Wu Y-C, Tang J-S, Li C-F, Guo G-Cet al., 2020,

    Environment-induced sudden change of coherence in quantum systems

    , PHYSICAL REVIEW A, Vol: 102, ISSN: 2469-9926

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