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  • 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,

    >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
    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
  • 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
  • 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
    Liu X, Truppe S, Meijer G, Pérez-Ríos Jet al., 2020,

    The diatomic molecular spectroscopy database

    , Journal of Cheminformatics, Vol: 12

    <jats:title>Abstract</jats:title><jats:sec><jats:title>Motivation</jats:title><jats:p>The spectroscopy of diatomic molecules is an important research area in chemical physics due to its relevance in astrochemistry, combustion chemistry, and ultracold physics. However, there is currently no database where the user can easily retrieve, in a useful format, the spectroscopic constants of a given molecule. A similar situation appears concerning the vibrational Franck–Condon factors for diatomic molecules, a crucial parameter to infer laser cooling prospects for molecules. To address this problem, and inspired by the idea that data should be open and freely accessible, we have developed a user-friendly website (<jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="https://rios.mp.fhi.mpg.de">https://rios.mp.fhi.mpg.de</jats:ext-link>) where the user can retrieve spectroscopic constants and Franck–Condon factors in useful formats.</jats:p></jats:sec><jats:sec><jats:title>Implementation</jats:title><jats:p>In this database, the spectroscopic constants of the ground states and first excited states of the diatomic molecules are accessible from the website and can be retrieved in readable formats. The website is implemented within the LAMP web service stacks. In particular, using Linux as the operative system, Apache as the HTTP Server, MySQL as the database management system, and PHP as the programming language for the web. Furthermore, the user can register and upload new data. This project is licensed under the Free-Libre/Open Source Software (FLOSS) license Apache License 2.0 which allows free and open access to the codes as well as efficient collaboration in the maintenance of the software.</jats:p></jats:sec><jats:sec><jats:title>Conclusions and impact</jats:title><jats:p>The
  • 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
    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
  • Journal article
    Burdekin P, Grandi S, Newbold R, Hoggarth RA, Major KD, Clark ASet al., 2020,

    Single-Photon-Level Sub-Doppler Pump-Probe Spectroscopy of Rubidium

    , PHYSICAL REVIEW APPLIED, Vol: 14, ISSN: 2331-7019
  • Journal article
    Thekkadath GS, Mycroft ME, Bell BA, Wade CG, Eckstein A, Phillips DS, Patel RB, Buraczewski A, Lita AE, Gerrits T, Nam SW, Stobinska M, Lvovsky AI, Walmsley IAet al., 2020,

    Quantum-enhanced interferometry with large heralded photon-number states

    , NPJ QUANTUM INFORMATION, Vol: 6
  • Journal article
    Tardiff E, Fan X, Gabrielse G, Grzonka D, Hamley C, Hessels EA, Jones N, Khatri G, Kolthammer WS, Martinez Zambrano D, Meisenhelder C, Morrison T, Nottet E, Novitski E, Storry CHet al., 2020,

    Two-symmetry Penning-Ioffe trap for antihydrogen cooling and spectroscopy

    , Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol: 977, Pages: 1-17, ISSN: 0168-9002

    High-accuracy spectroscopic comparisons of trapped antihydrogen atoms (H) and hydrogen atoms (H) promiseto stringently test the fundamental CPT symmetry invariance of the standard model of particle physics. ATRAP’snested Penning-Ioffe trap was developed for such studies. The first of its unique features is that its magneticIoffe trap forHatoms can be switched between quadrupole and octupole symmetries. The second is that itallows laser and microwave access perpendicular to the central axis of the traps.
  • Journal article
    Nehra R, Eaton M, Gonzalez-Arciniegas C, Kim MS, Gerrits T, Lita A, Nam SW, Pfister Oet al., 2020,

    Generalized overlap quantum state tomography

    , PHYSICAL REVIEW RESEARCH, Vol: 2
  • Journal article
    Driver T, Cooper B, Ayers R, Pipkorn R, Patchkovskii S, Averbukh V, Klug D, Marangos J, Frasinski L, Edelson-Averbukh Met al., 2020,

    Two-dimensional partial covariance mass spectrometry of large molecules based on fragment correlations

    , Physical Review X, Vol: 10, Pages: 041004 – 1-041004 – 13, ISSN: 2160-3308

    Covariance mapping [L. J. Frasinski, K. Codling, and P. A. Hatherly, Science 246, 1029 (1989)] is a well-established technique used for the study of mechanisms of laser-induced molecular ionization and decomposition. It measures statistical correlations between fluctuating signals of pairs of detected species (ions, fragments, electrons). A positive correlation identifies pairs of products originating from the same dissociation or ionization event. A major challenge for covariance-mapping spectroscopy is accessing decompositions of large polyatomic molecules, where true physical correlations are overwhelmed by spurious signals of no physical significance induced by fluctuations in experimental parameters. As a result, successful applications of covariance mapping have so far been restricted to low-mass systems, e.g., organic molecules of around 50 daltons (Da). Partial-covariance mapping was suggested to tackle the problem of spurious correlations by taking into account the independently measured fluctuations in the experimental conditions. However, its potential has never been realized for the decomposition of large molecules, because in these complex situations, determining and continuously monitoring multiple experimental parameters affecting all the measured signals simultaneously becomes unfeasible. We introduce, through deriving theoretically and confirming experimentally, a conceptually new type of partial-covariance mapping—self-correcting partial-covariance spectroscopy—based on a parameter extracted from the measured spectrum itself. We use the readily available total ion count as the self-correcting partial-covariance parameter, thus eliminating the challenge of determining experimental parameter fluctuations in covariance measurements of large complex systems. The introduced self-correcting partial covariance enables us to successfully resolve correlations of molecules as large as
  • Journal article
    Liu W, Wang Y-T, Li Z-P, Yu S, Ke Z-J, Meng Y, Tang J-S, Li C-F, Guo G-Cet al., 2020,

    An ultrastable and robust single-photon emitter in hexagonal boron nitride

    , Physica E: Low-dimensional Systems and Nanostructures, Vol: 124, Pages: 114251-114251, ISSN: 1386-9477
  • Journal article
    Khokhlova M, Bahmanpour L, Bachhawat N, Cooper B, Averbukh Vet al., 2020,

    Interatomic coulombic decay rate in endohedral complexes

    , JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, Vol: 53, ISSN: 0953-4075
  • Journal article
    Kuroś A, Mukherjee R, Golletz W, Sauvage F, Giergiel K, Mintert F, Sacha Ket al., 2020,

    Phase diagram and optimal control for n-tupling discrete time crystal

    , New Journal of Physics, Vol: 22, Pages: 1-13, ISSN: 1367-2630
  • Journal article
    Kwon H, Paige AJ, Kim MS, 2020,

    Condition on the Rényi entanglement entropy under stochastic local manipulation

    , Physical Review Letters, Vol: 125, Pages: 100502 – 1-100502 – 7, ISSN: 0031-9007

    The Rényi entanglement entropy (REE) is an entanglement quantifier considered as a natural generalization of the entanglement entropy. When it comes to stochastic local operations and classical communication (SLOCC), however, only a limited class of the REEs satisfy the monotonicity condition, while their statistical properties beyond mean values have not been fully investigated. Here, we establish a general condition that the probability distribution of the REE of any order obeys under SLOCC. The condition is obtained by introducing a family of entanglement monotones that contain the higher-order moments of the REEs. The contribution from the higher-order moments imposes a strict limitation on entanglement distillation via SLOCC. We find that the upper bound on success probabilities for entanglement distillation exponentially decreases as the amount of raised entanglement increases, which cannot be captured from the monotonicity of the REE. Based on the strong restriction on entanglement transformation under SLOCC, we design a new method to estimate entanglement in quantum many-body systems from experimentally observable quantities.

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