Publications
2025
Multiphoton, multimode state classification for nonlinear optical circuits
D. Kopylov, C. Offen, L. Ares, B.E. Wembe Moafo, S. Ober-Blöbaum, T. Meier, P. Sharapova, J. Sperling, (n.d.).
2024
Unbreakable and breakable quantum censorship
J. Pinske, J. Sperling, Physical Review A 109 (2024).
Realization of high-fidelity unitary operations on up to 64 frequency bins
S. De, V. Ansari, J. Sperling, S. Barkhofen, B. Brecht, C. Silberhorn, Physical Review Research 6 (2024).
Certifying the Topology of Quantum Networks: Theory and Experiment
L.T. Weinbrenner, N. Prasannan, K. Hansenne, S. Denker, J. Sperling, B. Brecht, C. Silberhorn, O. Gühne, Physical Review Letters 132 (2024).
Entanglement-assisted quantum speedup: Beating local quantum speed limits
F. Yasmin, J. Sperling, Physical Review A 110 (2024).
Quantum walks and entanglement in cavity networks
C. Di Fidio, L. Ares, J. Sperling, Physical Review A 110 (2024).
Low-noise balanced homodyne detection with superconducting nanowire single-photon detectors
M. Protte, T. Schapeler, J. Sperling, T. Bartley, Optica Quantum 2 (2024).
Experimental observation of topological quantum criticality
S. Barkhofen, S. De, J. Sperling, C. Silberhorn, A. Altland, D. Bagrets, K.W. Kim, T. Micklitz, Physical Review Research 6 (2024).
Experimental retrieval of photon statistics from click detection
S. Krishnaswamy, F. Schlue, L. Ares, V. Dyachuk, M. Stefszky, B. Brecht, C. Silberhorn, J. Sperling, Physical Review A 110 (2024).
2023
Entanglement of particles versus entanglement of fields: Independent quantum resources
J. Sperling, E. Agudelo, Physical Review A 107 (2023).
Detector entanglement: Quasidistributions for Bell-state measurements
J. Sperling, I. Gianani, M. Barbieri, E. Agudelo, Physical Review A 107 (2023).
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 130 (2023).
2022
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, p. JTu3A. 17.
Direct Measurement of Higher-Order Nonlinear Polarization Squeezing
N. Prasannan, J. Sperling, B. Brecht, C. Silberhorn, Physical Review Letters 129 (2022).
Driven Gaussian quantum walks
P. Held, M. Engelkemeier, S. De, S. Barkhofen, J. Sperling, C. Silberhorn, Physical Review A 105 (2022).
2021
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).
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).
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).
Transient subdiffusion via disordered quantum walks
A. Geraldi, S. De, A. Laneve, S. Barkhofen, J. Sperling, P. Mataloni, C. Silberhorn, Physical Review Research (2021).
Statistical Benchmarking of Scalable Photonic Quantum Systems
J. Tiedau, M. Engelkemeier, B. Brecht, J. Sperling, C. Silberhorn, Physical Review Letters 126 (2021).
Experimental entanglement characterization of two-rebit states
N. Prasannan, S. De, S. Barkhofen, B. Brecht, C. Silberhorn, J. Sperling, Physical Review A 103 (2021).
Quantum Correlations beyond Entanglement and Discord
S. Köhnke, E. Agudelo, M. Schünemann, O. Schlettwein, W. Vogel, J. Sperling, B. Hage, Physical Review Letters (2021).
2020
Detector-Agnostic Phase-Space Distributions
J. Sperling, D.S. Phillips, J.F.F. Bulmer, G.S. Thekkadath, A. Eckstein, T.A.W. Wolterink, J. Lugani, S.W. Nam, A. Lita, T. Gerrits, W. Vogel, G.S. Agarwal, C. Silberhorn, I.A. Walmsley, Physical Review Letters (2020).
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 102 (2020).
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).
Probing nonclassicality with matrices of phase-space distributions
M. Bohmann, E. Agudelo, J. Sperling, Quantum (2020).
2019
Quasiprobability distributions for quantum-optical coherence and beyond
J. Sperling, W. Vogel, Physica Scripta (2019).
Measuring coherence of quantum measurements
V. Cimini, I. Gianani, M. Sbroscia, J. Sperling, M. Barbieri, Physical Review Research (2019).
What can single photons do what lasers cannot do?
M. Rezai, J. Sperling, I. Gerhardt, Quantum Science and Technology (2019).
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).
Mode-independent quantum entanglement for light
J. Sperling, A. Perez-Leija, K. Busch, C. Silberhorn, Physical Review A (2019).
Experimental Reconstruction of Entanglement Quasiprobabilities
J. Sperling, E. Meyer-Scott, S. Barkhofen, B. Brecht, C. Silberhorn, Physical Review Letters (2019).
2018
Numerical Construction of Multipartite Entanglement Witnesses
S. Gerke, W. Vogel, J. Sperling, Physical Review X (2018).
Quasiprobability representation of quantum coherence
J. Sperling, I.A. Walmsley, Physical Review A (2018).
Geometrical picture of photocounting measurements
O.P. Kovalenko, J. Sperling, W. Vogel, A.A. Semenov, Physical Review A (2018).
Incomplete Detection of Nonclassical Phase-Space Distributions
M. Bohmann, J. Tiedau, T. Bartley, J. Sperling, C. Silberhorn, W. Vogel, Physical Review Letters (2018).
2017
Separable and Inseparable Quantum Trajectories
J. Sperling, I.A. Walmsley, Physical Review Letters (2017).
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).
Quantum coherences of indistinguishable particles
J. Sperling, A. Perez-Leija, K. Busch, I.A. Walmsley, Physical Review A (2017).
Conditional Hybrid Nonclassicality
E. Agudelo, J. Sperling, L.S. Costanzo, M. Bellini, A. Zavatta, W. Vogel, Physical Review Letters (2017).
Displaced photon-number entanglement tests
B. Kühn, W. Vogel, J. Sperling, Physical Review A (2017).
Entanglement verification of noisy NOON states
M. Bohmann, J. Sperling, W. Vogel, Physical Review A (2017).
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).
Quantum correlations in composite systems
J. Sperling, E. Agudelo, I.A. Walmsley, W. Vogel, Journal of Physics B: Atomic, Molecular and Optical Physics (2017).
Time-dependent quantum correlations in phase space
F. Krumm, W. Vogel, J. Sperling, Physical Review A (2017).
Probing free-space quantum channels with laboratory-based experiments
M. Bohmann, R. Kruse, J. Sperling, C. Silberhorn, W. Vogel, Physical Review A (2017).
Quantifying nonclassicality by characteristic functions
S. Ryl, J. Sperling, W. Vogel, Physical Review A (2017).
Detector-Independent Verification of Quantum Light
J. Sperling, W.R. Clements, A. Eckstein, M. Moore, J.J. Renema, W.S. Kolthammer, S.W. Nam, A. Lita, T. Gerrits, W. Vogel, G.S. Agarwal, I.A. Walmsley, Physical Review Letters (2017).
Direct calibration of click-counting detectors
M. Bohmann, R. Kruse, J. Sperling, C. Silberhorn, W. Vogel, Physical Review A (2017).
Higher-order nonclassical effects in fluctuating-loss channels
M. Bohmann, J. Sperling, A.A. Semenov, W. Vogel, Physical Review A (2017).
Two-particle four-point correlations in dynamically disordered tight-binding networks
A. Perez-Leija, R. de J. Leon-Montiel, J. Sperling, H. Moya-Cessa, A. Szameit, K. Busch, Journal of Physics B: Atomic, Molecular and Optical Physics (2017).
2016
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).
Quantum Correlations from the Conditional Statistics of Incomplete Data
J. Sperling, T. Bartley, G. Donati, M. Barbieri, X.-M. Jin, A. Datta, W. Vogel, I.A. Walmsley, Physical Review Letters (2016).
Gaussian entanglement in the turbulent atmosphere
M. Bohmann, A.A. Semenov, J. Sperling, W. Vogel, Physical Review A (2016).
Operational definition of quantum correlations of light
J. Sperling, W. Vogel, G.S. Agarwal, Physical Review A (2016).
Characterizing maximally singular phase-space distributions
J. Sperling, Physical Review A (2016).
Multitime correlation functions in nonclassical stochastic processes
F. Krumm, J. Sperling, W. Vogel, Physical Review A (2016).
Witnessing random unitary and projective quantum channels: Complementarity between separable and maximally entangled states
D. Bruns, J. Sperling, S. Scheel, Physical Review A (2016).
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).
2015
Homodyne detection with on-off detector systems
T. Lipfert, J. Sperling, W. Vogel, Physical Review A (2015).
Continuous sampling of the squeezed-state nonclassicality
E. Agudelo, J. Sperling, W. Vogel, S. Köhnke, M. Mraz, B. Hage, Physical Review A (2015).
Unified nonclassicality criteria
S. Ryl, J. Sperling, E. Agudelo, M. Mraz, S. Köhnke, B. Hage, W. Vogel, Physical Review A (2015).
Convex ordering and quantification of quantumness
J. Sperling, W. Vogel, Physica Scripta (2015).
Entanglement and phase properties of noisy NOON states
M. Bohmann, J. Sperling, W. Vogel, Physical Review A (2015).
Entanglement witnesses for indistinguishable particles
A. Reusch, J. Sperling, W. Vogel, Physical Review A (2015).
Nonclassicality Phase-Space Functions: More Insight with Fewer Detectors
A. Luis, J. Sperling, W. Vogel, Physical Review Letters (2015).
Balanced homodyne detection with on-off detector systems: Observable nonclassicality criteria
J. Sperling, W. Vogel, G.S. Agarwal, EPL (Europhysics Letters) (2015).
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).
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).
2014
Structural Quantification of Entanglement
F. Shahandeh, J. Sperling, W. Vogel, Physical Review Letters (2014).
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).
Witnessing the degree of nonclassicality of light
M. Mraz, J. Sperling, W. Vogel, B. Hage, Physical Review A (2014).
Unified quantification of nonclassicality and entanglement
W. Vogel, J. Sperling, Physical Review A (2014).
Quantum state engineering by click counting
J. Sperling, W. Vogel, G.S. Agarwal, Physical Review A (2014).
Bipartite bound entanglement in continuous variables through degaussification
F.E.S. Steinhoff, M.C. de Oliveira, J. Sperling, W. Vogel, Physical Review A (2014).
Operational Gaussian Schmidt-number witnesses
F. Shahandeh, J. Sperling, W. Vogel, Physical Review A (2014).
2013
Correlation measurements with on-off detectors
J. Sperling, W. Vogel, G.S. Agarwal, Physical Review A (2013).
Multipartite entangled light from driven microcavities
D. Pagel, H. Fehske, J. Sperling, W. Vogel, Physical Review A (2013).
Quasiprobabilities for multipartite quantum correlations of light
E. Agudelo, J. Sperling, W. Vogel, Physical Review A (2013).
2012
Strongly entangled light from planar microcavities
D. Pagel, H. Fehske, J. Sperling, W. Vogel, Physical Review A (2012).
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).
Entanglement quasiprobabilities of squeezed light
J. Sperling, W. Vogel, New Journal of Physics (2012).
True photocounting statistics of multiple on-off detectors
J. Sperling, W. Vogel, G.S. Agarwal, Physical Review A (2012).
2011
The Schmidt number as a universal entanglement measure
J. Sperling, W. Vogel, Physica Scripta (2011).
2010
Characterizing nonclassicality and entanglement
W. Vogel, T. Kiesel, J. Sperling, Optics and Spectroscopy (2010) 197–205.
2009
Verifying continuous-variable entanglement in finite spaces
J. Sperling, W. Vogel, Physical Review A (2009).
Representation of entanglement by negative quasiprobabilities
J. Sperling, W. Vogel, Physical Review A (2009).
Necessary and sufficient conditions for bipartite entanglement
J. Sperling, W. Vogel, Physical Review A (2009).
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