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Publikationen


Liste im Research Information System öffnen

2020

Cryogenic electro-optic polarisation conversion in titanium in-diffused lithium niobate waveguides

F. Thiele, F. vom Bruch, V. Quiring, R. Ricken, H. Herrmann, C. Eigner, C. Silberhorn, T. Bartley, Optics Express (2020)


Single-channel electronic readout of a multipixel superconducting nanowire single photon detector

J. Tiedau, T. Schapeler, V. Anant, H. Fedder, C. Silberhorn, T. Bartley, Optics Express (2020)


Quantum detector tomography of a 2×2 multi-pixel array of superconducting nanowire single photon detectors

T. Schapeler, J. Philipp Höpker, T. Bartley, Optics Express (2020)


2019

Scalability of parametric down-conversion for generating higher-order Fock states

J. Tiedau, T. Bartley, G. Harder, A.E. Lita, S.W. Nam, T. Gerrits, C. Silberhorn, Physical Review A (2019)


A high dynamic range optical detector for measuring single photons and bright light

J. Tiedau, E. Meyer-Scott, T. Nitsche, S. Barkhofen, T. Bartley, C. Silberhorn, Optics Express (2019)


Integrated transition edge sensors on titanium in-diffused lithium niobate waveguides

J.P. Höpker, T. Gerrits, A. Lita, S. Krapick, H. Herrmann, R. Ricken, V. Quiring, R. Mirin, S.W. Nam, C. Silberhorn, T. Bartley, APL Photonics (2019)


2018

Heralded orthogonalisation of coherent states and their conversion to discrete-variable superpositions

R. Kruse, C. Silberhorn, T. Bartley, Quantum Measurements and Quantum Metrology (2018), 4(1)

<jats:title>Abstract</jats:title><jats:p>The nonorthogonality of coherent states is a fundamental property which prevents them from being perfectly and deterministically discriminated. Here, we present an experimentally feasible protocol for the probabilistic orthogonalisation of a pair of coherent states, independent of their amplitude and phase. In contrast to unambiguous state discrimination, a successful operation of our protocol is heralded without measuring the states. As such, they remain suitable for further manipulation and the obtained orthogonal states serve as a discretevariable basis. Therefore, our protocol doubles as a simple continuous-to-discrete variable converter, which may find application in hybrid continuous-discrete quantum information processing protocols.</jats:p>


    Incomplete Detection of Nonclassical Phase-Space Distributions

    M. Bohmann, J. Tiedau, T. Bartley, J. Sperling, C. Silberhorn, W. Vogel, Physical Review Letters (2018)


    Compressive characterization of telecom photon pairs in the spatial and spectral degrees of freedom

    N. Montaut, O.S. Magaña-Loaiza, T. Bartley, V.B. Verma, S.W. Nam, R.P. Mirin, C. Silberhorn, T. Gerrits, Optica (2018)


    Quantum state and mode profile tomography by the overlap

    J. Tiedau, V.S. Shchesnovich, D. Mogilevtsev, V. Ansari, G. Harder, T. Bartley, N. Korolkova, C. Silberhorn, New Journal of Physics (2018)


    2017

    Full statistical mode reconstruction of a light field via a photon-number-resolved measurement

    I.A. Burenkov, A.K. Sharma, T. Gerrits, G. Harder, T. Bartley, C. Silberhorn, E.A. Goldschmidt, S.V. Polyakov, Physical Review A (2017)


    Discorrelated quantum states

    E. Meyer-Scott, J. Tiedau, G. Harder, L.K. Shalm, T. Bartley, Scientific Reports (2017), 7


    Limits of the time-multiplexed photon-counting method

    R. Kruse, J. Tiedau, T. Bartley, S. Barkhofen, C. Silberhorn, Physical Review A (2017)


    Driven Boson Sampling

    S. Barkhofen, T. Bartley, L. Sansoni, R. Kruse, C.S. Hamilton, I. Jex, C. Silberhorn, Physical Review Letters (2017)


    Towards integrated superconducting detectors on lithium niobate waveguides

    J.P. Höpker, M. Bartnick, E. Meyer-Scott, F. Thiele, T. Meier, T. Bartley, S. Krapick, N.M. Montaut, M. Santandrea, H. Herrmann, S. Lengeling, R. Ricken, V. Quiring, A.E. Lita, V.B. Verma, T. Gerrits, S.W. Nam, C. Silberhorn, in: Quantum Photonic Devices, 2017, pp. 1035809


    Limits on the heralding efficiencies and spectral purities of spectrally filtered single photons from photon-pair sources

    E. Meyer-Scott, N. Montaut, J. Tiedau, L. Sansoni, H. Herrmann, T. Bartley, C. Silberhorn, Physical Review A (2017)


    Harnessing temporal modes for multi-photon quantum information processing based on integrated optics

    G. Harder, V. Ansari, T. Bartley, B. Brecht, C. Silberhorn, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences (2017)


    2016

    Quantum enhanced estimation of optical detector efficiencies

    M. Barbieri, A. Datta, T. Bartley, X. Jin, W.S. Kolthammer, I.A. Walmsley, Quantum Measurements and Quantum Metrology (2016)

    <jats:title>Abstract</jats:title><jats:p>Quantum mechanics establishes the ultimate limit to the scaling of the precision on any parameter, by identifying optimal probe states and measurements. While this paradigm is, at least in principle, adequate for the metrology of quantum channels involving the estimation of phase and loss parameters, we show that estimating the loss parameters associated with a quantum channel and a realistic quantum detector are fundamentally different. While Fock states are provably optimal for the former, we identify a crossover in the nature of the optimal probe state for estimating detector imperfections as a function of the loss parameter using Fisher information as a benchmark. We provide theoretical results for on-off and homodyne detectors, the most widely used detectors in quantum photonics technologies, when using Fock states and coherent states as probes.</jats:p>


      Quantum enhanced estimation of optical detector efficiencies

      M. Barbieri, A. Datta, T. Bartley, X. Jin, W.S. Kolthammer, I.A. Walmsley, Quantum Measurements and Quantum Metrology (2016)

      <jats:title>Abstract</jats:title><jats:p>Quantum mechanics establishes the ultimate limit to the scaling of the precision on any parameter, by identifying optimal probe states and measurements. While this paradigm is, at least in principle, adequate for the metrology of quantum channels involving the estimation of phase and loss parameters, we show that estimating the loss parameters associated with a quantum channel and a realistic quantum detector are fundamentally different. While Fock states are provably optimal for the former, we identify a crossover in the nature of the optimal probe state for estimating detector imperfections as a function of the loss parameter using Fisher information as a benchmark. We provide theoretical results for on-off and homodyne detectors, the most widely used detectors in quantum photonics technologies, when using Fock states and coherent states as probes.</jats:p>


        Single-Mode Parametric-Down-Conversion States with 50 Photons as a Source for Mesoscopic Quantum Optics

        G. Harder, T. Bartley, A.E. Lita, S.W. Nam, T. Gerrits, C. Silberhorn, Physical Review Letters (2016)


        Quantum Correlations from the Conditional Statistics of Incomplete Data

        J. Sperling, T. Bartley, G. Donati, M. Barbieri, X. Jin, A. Datta, W. Vogel, I. Walmsley, Physical Review Letters (2016)


        2015

        Directly comparing entanglement-enhancing non-Gaussian operations

        T. Bartley, I.A. Walmsley, New Journal of Physics (2015)


        2014

        Observing optical coherence across Fock layers with weak-field homodyne detectors

        G. Donati, T. Bartley, X. Jin, M. Vidrighin, A. Datta, M. Barbieri, I.A. Walmsley, Nature Communications (2014)


        2013

        Direct Observation of Sub-Binomial Light

        T. Bartley, G. Donati, X. Jin, A. Datta, M. Barbieri, I.A. Walmsley, Physical Review Letters (2013)


        Strategies for enhancing quantum entanglement by local photon subtraction

        T. Bartley, P.J.D. Crowley, A. Datta, J. Nunn, L. Zhang, I. Walmsley, Physical Review A (2013)


        Requirements for two-source entanglement concentration

        M. Vidrighin, T. Bartley, G. Donati, X. Jin, M. Barbieri, W.S. Kolthammer, A. Datta, I.A. Walmsley, Quantum Measurements and Quantum Metrology (2013)


        2012

        Multiphoton state engineering by heralded interference between single photons and coherent states

        T. Bartley, G. Donati, J.B. Spring, X. Jin, M. Barbieri, A. Datta, B.J. Smith, I.A. Walmsley, Physical Review A (2012)


        2011

        Continuous phase stabilization and active interferometer control using two modes

        G. Jotzu, T. Bartley, H.B. Coldenstrodt-Ronge, B.J. Smith, I.A. Walmsley, Journal of Modern Optics (2011), pp. 42-45


        2009

        Feasibility of free space quantum key distribution with coherent polarization states

        D. Elser, T. Bartley, B. Heim, C. Wittmann, D. Sych, G. Leuchs, New Journal of Physics (2009)(4), pp. 045014

        We demonstrate for the first time the feasibility of free space quantum key distribution with continuous variables under real atmospheric conditions. More specifically, we transmit coherent polarization states over a 100 m free space channel on the roof of our institute's building. In our scheme, signal and local oscillator (LO) are combined in a single spatial mode, which auto-compensates atmospheric fluctuations and results in an excellent interference. Furthermore, the LO acts as a spatial and spectral filter, thus allowing unrestrained daylight operation.


          Atmospheric channel characteristics for quantum communication with continuous polarization variables

          B. Heim, D. Elser, T. Bartley, M. Sabuncu, C. Wittmann, D. Sych, C. Marquardt, G. Leuchs, Applied Physics B (2009), pp. 635-640


          Liste im Research Information System öffnen

          Gruppenleitung

          J.-Prof. Dr. Tim Bartley

          Mesoskopische Quantenoptik

          Tim Bartley
          Telefon:
          +49 5251 60-5881
          Büro:
          P8.3.13

          Die Universität der Informationsgesellschaft