Department Physik - Publications (Universität Paderborn)

Entanglement of particles versus entanglement of fields: Independent quantum resources

J. Sperling, E. Agudelo, Physical Review A (2023), 107(4), 042420

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Detector entanglement: Quasidistributions for Bell-state measurements

J. Sperling, I. Gianani, M. Barbieri, E. Agudelo, Physical Review A (2023), 107(1), 012426

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Tracking Quantum Coherence in Polariton Condensates with Time-Resolved Tomography

C. Lüders, M. Pukrop, F. Barkhausen, E. Rozas, C. Schneider, S. Höfling, J. Sperling, S. Schumacher, M. Aßmann, Physical Review Letters (2023), 130(11), 113601

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Two-Mode Photon-Number Correlations Created by Measurement-Induced Nonlinearity

T. Meier, J.P. Hoepker, M. Protte, C. Eigner, C. Silberhorn, P.R. Sharapova, J. Sperling, T. Bartley, in: Conference on Lasers and Electro-Optics: Applications and Technology, Optica Publishing Group, 2022, pp. JTu3A. 17

Abstract

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We demonstrate theoretically and experimentally complex correlations in the photon numbers of two-mode quantum states using measurement-induced nonlinearity. For this, we combine the interference of coherent states and single photons with photon sub-traction.

Driven Gaussian quantum walks

P. Held, M. Engelkemeier, S. De, S. Barkhofen, J. Sperling, C. Silberhorn, Physical Review A (2022), 105(4), 042210

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Direct Measurement of Higher-Order Nonlinear Polarization Squeezing

N. Prasannan, J. Sperling, B. Brecht, C. Silberhorn, Physical Review Letters (2022), 129(26), 263601

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Quantum optical coherence: From linear to nonlinear interferometers

K.H. Luo, M. Santandrea, M. Stefszky, J. Sperling, M. Massaro, A. Ferreri, P. Sharapova, H. Herrmann, C. Silberhorn, Physical Review A (2021)

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Quantifying Quantum Coherence in Polariton Condensates

C. Lüders, M. Pukrop, E. Rozas, C. Schneider, S. Höfling, J. Sperling, S. Schumacher, M. Aßmann, PRX Quantum (2021)

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Probing the topological Anderson transition with quantum walks

D. Bagrets, K.W. Kim, S. Barkhofen, S. De, J. Sperling, C. Silberhorn, A. Altland, T. Micklitz, Physical Review Research (2021)

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Transient subdiffusion via disordered quantum walks

A. Geraldi, S. De, A. Laneve, S. Barkhofen, J. Sperling, P. Mataloni, C. Silberhorn, Physical Review Research (2021)

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Statistical Benchmarking of Scalable Photonic Quantum Systems

J. Tiedau, M. Engelkemeier, B. Brecht, J. Sperling, C. Silberhorn, Physical Review Letters (2021), 126, 023601

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Experimental entanglement characterization of two-rebit states

N. Prasannan, S. De, S. Barkhofen, B. Brecht, C. Silberhorn, J. Sperling, Physical Review A (2021), 103

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Quantum Correlations beyond Entanglement and Discord

S. Köhnke, E. Agudelo, M. Schünemann, O. Schlettwein, W. Vogel, J. Sperling, B. Hage, Physical Review Letters (2021)

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Detector-Agnostic Phase-Space Distributions

J. Sperling, D. Phillips, J. Bulmer, G. Thekkadath, A. Eckstein, T. Wolterink, J. Lugani, S. Nam, A. Lita, T. Gerrits, W. Vogel, G. Agarwal, C. Silberhorn, I. Walmsley, Physical Review Letters (2020)

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Quantum photonics with active feedback loops

M. Engelkemeier, L. Lorz, S. De, B. Brecht, I. Dhand, M.B. Plenio, C. Silberhorn, J. Sperling, Physical Review A (2020), 102, 023712

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Local Versus Global Two-Photon Interference in Quantum Networks

T. Nitsche, S. De, S. Barkhofen, E. Meyer-Scott, J. Tiedau, J. Sperling, A. Gábris, I. Jex, C. Silberhorn, Physical Review Letters (2020)

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Probing nonclassicality with matrices of phase-space distributions

M. Bohmann, E. Agudelo, J. Sperling, Quantum (2020), 343

Abstract

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<jats:p>We devise a method to certify nonclassical features via correlations of phase-space distributions by unifying the notions of quasiprobabilities and matrices of correlation functions. Our approach complements and extends recent results that were based on Chebyshev's integral inequality \cite{BA19}. The method developed here correlates arbitrary phase-space functions at arbitrary points in phase space, including multimode scenarios and higher-order correlations. Furthermore, our approach provides necessary and sufficient nonclassicality criteria, applies to phase-space functions beyond <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>s</mml:mi></mml:math>-parametrized ones, and is accessible in experiments. To demonstrate the power of our technique, the quantum characteristics of discrete- and continuous-variable, single- and multimode, as well as pure and mixed states are certified only employing second-order correlations and Husimi functions, which always resemble a classical probability distribution. Moreover, nonlinear generalizations of our approach are studied. Therefore, a versatile and broadly applicable framework is devised to uncover quantum properties in terms of matrices of phase-space distributions.</jats:p>

Classical evolution in quantum systems

J. Sperling, I.A. Walmsley, Physica Scripta (2020), 065101

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Quasiprobability distributions for quantum-optical coherence and beyond

J. Sperling, W. Vogel, Physica Scripta (2019), 034007

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Measuring coherence of quantum measurements

V. Cimini, I. Gianani, M. Sbroscia, J. Sperling, M. Barbieri, Physical Review Research (2019)

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What can single photons do what lasers cannot do?

M. Rezai, J. Sperling, I. Gerhardt, Quantum Science and Technology (2019), 045008

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Benchmarking of Gaussian boson sampling using two-point correlators

D.S. Phillips, M. Walschaers, J.J. Renema, I.A. Walmsley, N. Treps, J. Sperling, Physical Review A (2019)

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Mode-independent quantum entanglement for light

J. Sperling, A. Perez-Leija, K. Busch, C. Silberhorn, Physical Review A (2019)

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Experimental Reconstruction of Entanglement Quasiprobabilities

J. Sperling, E. Meyer-Scott, S. Barkhofen, B. Brecht, C. Silberhorn, Physical Review Letters (2019)

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Quasistates and quasiprobabilities

J. Sperling, I.A. Walmsley, Physical Review A (2018)

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Numerical Construction of Multipartite Entanglement Witnesses

S. Gerke, W. Vogel, J. Sperling, Physical Review X (2018)

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Quasiprobability representation of quantum coherence

J. Sperling, I.A. Walmsley, Physical Review A (2018)

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Geometrical picture of photocounting measurements

O.P. Kovalenko, J. Sperling, W. Vogel, A.A. Semenov, Physical Review A (2018)

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Incomplete Detection of Nonclassical Phase-Space Distributions

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

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Separable and Inseparable Quantum Trajectories

J. Sperling, I. Walmsley, Physical Review Letters (2017)

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High intensity click statistics from a 10 × 10 avalanche photodiode array

J. Kröger, T. Ahrens, J. Sperling, W. Vogel, H. Stolz, B. Hage, Journal of Physics B: Atomic, Molecular and Optical Physics (2017), 214003

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Quantum coherences of indistinguishable particles

J. Sperling, A. Perez-Leija, K. Busch, I.A. Walmsley, Physical Review A (2017)

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Conditional Hybrid Nonclassicality

E. Agudelo, J. Sperling, L. Costanzo, M. Bellini, A. Zavatta, W. Vogel, Physical Review Letters (2017)

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Displaced photon-number entanglement tests

B. Kühn, W. Vogel, J. Sperling, Physical Review A (2017)

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Entanglement verification of noisy NOON states

M. Bohmann, J. Sperling, W. Vogel, Physical Review A (2017)

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Identification of nonclassical properties of light with multiplexing layouts

J. Sperling, A. Eckstein, W.R. Clements, M. Moore, J.J. Renema, W.S. Kolthammer, S.W. Nam, A. Lita, T. Gerrits, I.A. Walmsley, G.S. Agarwal, W. Vogel, Physical Review A (2017)

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Entanglement in macroscopic systems

J. Sperling, I.A. Walmsley, Physical Review A (2017)

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Quantum correlations in composite systems

J. Sperling, E. Agudelo, I.A. Walmsley, W. Vogel, Journal of Physics B: Atomic, Molecular and Optical Physics (2017), 134003

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Time-dependent quantum correlations in phase space

F. Krumm, W. Vogel, J. Sperling, Physical Review A (2017)

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Probing free-space quantum channels with laboratory-based experiments

M. Bohmann, R. Kruse, J. Sperling, C. Silberhorn, W. Vogel, Physical Review A (2017)

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Quantifying nonclassicality by characteristic functions

S. Ryl, J. Sperling, W. Vogel, Physical Review A (2017)

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Detector-Independent Verification of Quantum Light

J. Sperling, W. Clements, A. Eckstein, M. Moore, J. Renema, W. Kolthammer, S. Nam, A. Lita, T. Gerrits, W. Vogel, G. Agarwal, I. Walmsley, Physical Review Letters (2017)

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Direct calibration of click-counting detectors

M. Bohmann, R. Kruse, J. Sperling, C. Silberhorn, W. Vogel, Physical Review A (2017)

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Higher-order nonclassical effects in fluctuating-loss channels

M. Bohmann, J. Sperling, A.A. Semenov, W. Vogel, Physical Review A (2017)

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Two-particle four-point correlations in dynamically disordered tight-binding networks

A. Perez-Leija, R.d.J. Leon-Montiel, J. Sperling, H. Moya-Cessa, A. Szameit, K. Busch, Journal of Physics B: Atomic, Molecular and Optical Physics (2017), 024002

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Multipartite Entanglement of a Two-Separable State

S. Gerke, J. Sperling, W. Vogel, Y. Cai, J. Roslund, N. Treps, C. Fabre, Physical Review Letters (2016)

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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)

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Gaussian entanglement in the turbulent atmosphere

M. Bohmann, A.A. Semenov, J. Sperling, W. Vogel, Physical Review A (2016)

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Operational definition of quantum correlations of light

J. Sperling, W. Vogel, G.S. Agarwal, Physical Review A (2016)

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Characterizing maximally singular phase-space distributions

J. Sperling, Physical Review A (2016)

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Multitime correlation functions in nonclassical stochastic processes

F. Krumm, J. Sperling, W. Vogel, Physical Review A (2016)

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Witnessing random unitary and projective quantum channels: Complementarity between separable and maximally entangled states

D. Bruns, J. Sperling, S. Scheel, Physical Review A (2016)

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Harnessing click detectors for the genuine characterization of light states

R. Heilmann, J. Sperling, A. Perez-Leija, M. Gräfe, M. Heinrich, S. Nolte, W. Vogel, A. Szameit, Scientific Reports (2016)

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Homodyne detection with on-off detector systems

T. Lipfert, J. Sperling, W. Vogel, Physical Review A (2015)

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Continuous sampling of the squeezed-state nonclassicality

E. Agudelo, J. Sperling, W. Vogel, S. Köhnke, M. Mraz, B. Hage, Physical Review A (2015)

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Unified nonclassicality criteria

S. Ryl, J. Sperling, E. Agudelo, M. Mraz, S. Köhnke, B. Hage, W. Vogel, Physical Review A (2015)

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Convex ordering and quantification of quantumness

J. Sperling, W. Vogel, Physica Scripta (2015), 074024

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Entanglement and phase properties of noisy NOON states

M. Bohmann, J. Sperling, W. Vogel, Physical Review A (2015)

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Entanglement witnesses for indistinguishable particles

A. Reusch, J. Sperling, W. Vogel, Physical Review A (2015)

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Nonclassicality Phase-Space Functions: More Insight with Fewer Detectors

A. Luis, J. Sperling, W. Vogel, Physical Review Letters (2015)

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Balanced homodyne detection with on-off detector systems: Observable nonclassicality criteria

J. Sperling, W. Vogel, G.S. Agarwal, EPL (Europhysics Letters) (2015), 34001

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Full Multipartite Entanglement of Frequency-Comb Gaussian States

S. Gerke, J. Sperling, W. Vogel, Y. Cai, J. Roslund, N. Treps, C. Fabre, Physical Review Letters (2015)

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Uncovering Quantum Correlations with Time-Multiplexed Click Detection

J. Sperling, M. Bohmann, W. Vogel, G. Harder, B. Brecht, V. Ansari, C. Silberhorn, Physical Review Letters (2015)

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Structural Quantification of Entanglement

F. Shahandeh, J. Sperling, W. Vogel, Physical Review Letters (2014)

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Detection of nonlocal superpositions

A.J. Gutiérrez-Esparza, W.M. Pimenta, B. Marques, A.A. Matoso, J. Sperling, W. Vogel, S. Pádua, Physical Review A (2014)

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Witnessing the degree of nonclassicality of light

M. Mraz, J. Sperling, W. Vogel, B. Hage, Physical Review A (2014)

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Unified quantification of nonclassicality and entanglement

W. Vogel, J. Sperling, Physical Review A (2014)

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Quantum state engineering by click counting

J. Sperling, W. Vogel, G.S. Agarwal, Physical Review A (2014)

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Bipartite bound entanglement in continuous variables through degaussification

F.E.S. Steinhoff, M.C. de Oliveira, J. Sperling, W. Vogel, Physical Review A (2014)

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Operational Gaussian Schmidt-number witnesses

F. Shahandeh, J. Sperling, W. Vogel, Physical Review A (2014)

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Correlation measurements with on-off detectors

J. Sperling, W. Vogel, G.S. Agarwal, Physical Review A (2013)

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Multipartite entangled light from driven microcavities

D. Pagel, H. Fehske, J. Sperling, W. Vogel, Physical Review A (2013)

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Multipartite Entanglement Witnesses

J. Sperling, W. Vogel, Physical Review Letters (2013)

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Quasiprobabilities for multipartite quantum correlations of light

E. Agudelo, J. Sperling, W. Vogel, Physical Review A (2013)

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Quantification of nonclassicality

C. Gehrke, J. Sperling, W. Vogel, Physical Review A (2012)

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Strongly entangled light from planar microcavities

D. Pagel, H. Fehske, J. Sperling, W. Vogel, Physical Review A (2012)

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Analytical progress on symmetric geometric discord: Measurement-based upper bounds

A. Miranowicz, P. Horodecki, R.W. Chhajlany, J. Tuziemski, J. Sperling, Physical Review A (2012)

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Sub-Binomial Light

J. Sperling, W. Vogel, G.S. Agarwal, Physical Review Letters (2012)

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Entanglement quasiprobabilities of squeezed light

J. Sperling, W. Vogel, New Journal of Physics (2012), 055026

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True photocounting statistics of multiple on-off detectors

J. Sperling, W. Vogel, G.S. Agarwal, Physical Review A (2012)

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Determination of the Schmidt number

J. Sperling, W. Vogel, Physical Review A (2011)

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The Schmidt number as a universal entanglement measure

J. Sperling, W. Vogel, Physica Scripta (2011), 045002

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Characterizing nonclassicality and entanglement

W. Vogel, T. Kiesel, J. Sperling, Optics and Spectroscopy (2010), pp. 197-205

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Verifying continuous-variable entanglement in finite spaces

J. Sperling, W. Vogel, Physical Review A (2009)

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Representation of entanglement by negative quasiprobabilities

J. Sperling, W. Vogel, Physical Review A (2009)

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Necessary and sufficient conditions for bipartite entanglement

J. Sperling, W. Vogel, Physical Review A (2009)

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Publikationen

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Head

Prof. Dr. Jan Sperling