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  • Journal article
    Boissier S, Schofield R, Jin L, Ovvyan A, Nur S, Koppens FHL, Toninelli C, Pernice WHP, Major K, Hinds E, Clark Aet al., 2021,

    Coherent characterisation of a single molecule in a photonic black box

    , Nature Communications, Vol: 12, ISSN: 2041-1723

    Extinction spectroscopy is a powerful tool for demonstrating the coupling of a single quantum emitter to a photonic structure. However, it can be challenging in all but the simplest of geometries to deduce an accurate value of the coupling efficiency from the measured spectrum. Here we develop a theoretical framework to deduce the coupling efficiency from the measured transmission and reflection spectra without precise knowledge of the photonic environment. We then consider the case of a waveguide interrupted by a transverse cut in which an emitter is placed. We apply that theory to a silicon nitride waveguide interrupted by a gap filled with anthracene that is doped with dibenzoterrylene molecules. We describe the fabrication of these devices, and experimentally characterise the waveguide coupling of a single molecule in the gap.

  • Journal article
    Austin D, Johnson A, McGrath F, Wood D, Miseikis L, Siegel T, Hawkins P, Harvey A, Mašín Z, Patchkovskii S, Vacher M, Malhado JP, Ivanov M, Smirnova O, Marangos Jet al., 2021,

    Extracting sub-cycle electronic and nuclear dynamics from high harmonic spectra

    , Scientific Reports, Vol: 11, ISSN: 2045-2322

    We present a new methodology for measuring few-femtosecond electronic and nuclear dynamics in both atoms and polyatomic molecules using multidimensional high harmonic generation (HHG) spectroscopy measurements, in which the spectra are recorded as a function of the laser intensity to form a two-dimensional data set. The method is applied to xenon atoms and to benzene molecules, the latter exhibiting significant fast nuclear dynamics following ionization. We uncover the signature of the sub-cycle evolution of the returning electron flux in strong-field ionized xenon atoms, implicit in the strong field approximation but not previously observed directly. We furthermore extract the nuclear autocorrelation function in strong field ionized benzene cations, which is determined to have a decay of τ0=4±1 fs, in good agreement with the τ0=3.5 fs obtained from direct dynamics variational multi-configuration Gaussian calculations. Our method requires minimal assumptions about the system, and is applicable even to un-aligned polyatomic molecules.

  • Journal article
    Zhao H, Mintert F, Moessner R, Knolle Jet al., 2021,

    Random Multipolar Driving: Tunably Slow Heating through Spectral Engineering

    , PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007
  • Journal article
    Devlin JA, Borchert MJ, Erlewein S, Fleck M, Harrington JA, Latacz B, Warncke J, Wursten E, Bohman MA, Mooser AH, Smorra C, Wiesinger M, Will C, Blaum K, Matsuda Y, Ospelkaus C, Quint W, Walz J, Yamazaki Y, Ulmer Set al., 2021,

    Constraints on the Coupling between Axionlike Dark Matter and Photons Using an Antiproton Superconducting Tuned Detection Circuit in a Cryogenic Penning Trap

    , PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007
  • Journal article
    Enzian G, Price JJ, Freisem L, Nunn J, Janousek J, Buchler BC, Lam PK, Vanner MRet al., 2021,

    Single-Phonon Addition and Subtraction to a Mechanical Thermal State

    , PHYSICAL REVIEW LETTERS, Vol: 126, ISSN: 0031-9007
  • Journal article
    Jarlaud V, Hrmo P, Joshi MK, Thompson RCet al., 2021,

    Coherence properties of highly-excited motional states of a trapped ion

    , Journal of Physics B: Atomic, Molecular and Optical Physics, Vol: 54, Pages: 1-12, ISSN: 0953-4075

    We present a study of the coherence properties of a variety of motional states of a single ion confined in a Penning ion trap. We demonstrate that the motion of the ion has a coherence time of the order of 1 s, using Ramsey interferometry. We introduce a technique for preparing the ion in an incoherent superposition of highly-excited motional states using a simple modification of optical sideband cooling. Coherent manipulation of these states allows measurements of optical and motional coherence to be carried out. We show that these highly-excited motional state superpositions have long coherence times despite the incoherent preparation of the states. Such states can be useful for sensitive motional dephasing measurements.

  • 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
    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
    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
    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
    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
    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

  • Journal article
    Fitch NJ, Lim J, Hinds EA, Sauer BE, Tarbutt MRet al., 2021,

    Methods for measuring the electron's electric dipole moment using ultracold YbF molecules

    , QUANTUM SCIENCE AND TECHNOLOGY, Vol: 6, ISSN: 2058-9565
  • 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

  • Journal article
    Kim MS, 2021,

    A massive test

    , NATURE PHYSICS, Vol: 17, Pages: 14-15, ISSN: 1745-2473
  • 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
    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
    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
    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
  • 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
    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
    Garratt D, Misiekis L, Wood D, Witting-Larsen E, Matthews M, Alexander O, Ye P, Jarosch S, Bakulin A, Penfold T, Marangos Jet al., 2021,

    Ultrafast Exciton Dynamics in Poly(3-hexylthiophene) Probed with Time Resolved X-ray Absorption Spectroscopy at the Carbon K- edge

    , Conference on Lasers and Electro-Optics Europe / European Quantum Electronics Conference (CLEO/Europe-EQEC), Publisher: IEEE
  • 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

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