408 citations · 1.5k across the 27 of their papers we have counts for
26 papers · 1 filter
Emulation of quantum measurements with mixtures of coherent states
A. Mikhalychev, Y. S. Teo, H. Jeong +2
We propose a methodology to emulate quantum phenomena arising from any non-classical quantum state using only a finite set of mixtures of coherent states. This allows us to success…
Experimental requirements for entangled two-photon spectroscopy
Stefan Lerch, André Stefanov
Entangled two-photon spectroscopy is expected to provide advantages compared with classical protocols. It is achieved by coherently controlling the spectral properties of energy-en…
Self-calibrating Optical Low-Coherence Reflectometry with Energy-Time Entangled Photons for Absolute Distance Measurements
Manuel Unternährer, André Stefanov
Optical low-coherence reflectometry is capable of unambiguously measuring positions of stacked, partially reflective layers in a sample object. It relies on the low coherence of th…
Properties of upconverted entangled broadband light
Stefan Lerch, André Stefanov
We experimentally investigate the properties of light generated by the sequential processes of spontaneous parametric downconversion followed by upconversion. By interfering the up…
Preliminary investigation of a new state estimation technique using device-independent maximum likelihood estimation
Sacha Schwarz, Bruno Eckmann, Denis Rosset +1
In quantum state tomography, the estimated frequencies do not correspond directly to a physical quantum state, due to statistical fluctuations. Thus, one resorts to point estimator…
Super-Resolution Quantum Imaging at the Heisenberg Limit
Manuel Unternährer, Bänz Bessire, Leonardo Gasparini +2
Quantum imaging exploits the spatial correlations between photons to image object features with a higher resolution than a corresponding classical light source could achieve. Using…
Observing the transition from quantum to classical energy correlations with photon pairs
Stefan Lerch, André Stefanov
We experimentally demonstrate a method to control the relative amount of quantum and classical energy correlations between two photons from a pair emitted by spontaneous parametric…
Optimal measurements for nonlocal correlations
Sacha Schwarz, Andre Stefanov, Stefan Wolf +1
A problem in quantum information theory is to find the experimental setup that maximizes the nonlocality of correlations with respect to some suitable measure such as the violation…
Bell inequalities with three ternary-outcome measurements - from theory to experiments (PLUS A CORRIGENDUM)
Sacha Schwarz, Bänz Bessire, André Stefanov +1
We explore quantum nonlocality in one of the simplest bipartite scenarios. Several new facet-defining Bell inequalities for the {[3 3 3] [3 3 3]} scenario are obtained with their q…
Experimental violation of a d-dimensional Bell inequality using energy-time entangled photons
Sacha Schwarz, Bänz Bessire, André Stefanov
We experimentally study the violation of the CGLMP inequality for entangled 2-qubit and 2-qutrit states with different degrees of entanglement using numerically optimized measureme…
Tuning curve of type-0 spontaneous parametric down-conversion
Stefan Lerch, Bänz Bessire, Christof Bernhard +2
We study the tuning curve of entangled photons generated by type-0 spontaneous parametric down-conversion in a periodically poled KTP crystal. We demonstrate the X-shaped spatiotem…
Correction of dephasing oscillations in matter wave interferometry
Alexander Rembold, Georg Schütz, Wei-Tse Chang +5
Vibrations, electromagnetic oscillations and temperature drifts are among the main reasons for dephasing in matter-wave interferometry. Sophisticated interferometry experiments, e.…
Versatile shaper-assisted discretization of energy-time entangled photons
Bänz Bessire, Christof Bernhard, André Stefanov +1
We demonstrate the capability to discretize the frequency spectrum of broadband energy-time entangled photons by means of a spatial light modulator to encode qudits in various base…
Shaping frequency entangled qudits
Christof Bernhard, Bänz Bessire, Thomas Feurer +1
Quantum entanglement between qudits - the d-dimensional version of qubits - is relevant for advanced quantum information processing and provides deeper insights in the nature of qu…
A simple scheme for expanding photonic cluster states for quantum information
Pruet Kalasuwan, Gabriel Mendoza, Anthony Laing +6
We show how an entangled cluster state encoded in the polarization of single photons can be straightforwardly expanded by deterministically entangling additional qubits encoded in…
Manipulating multi-photon entanglement in waveguide quantum circuits
Jonathan C. F. Matthews, Alberto Politi, Andre Stefanov +1
On-chip integrated photonic circuits are crucial to further progress towards quantum technologies and in the science of quantum optics. Here we report precise control of single pho…
Gas phase sorting of nanoparticles
Hendrik Ulbricht, Martin Berninger, Sarayut Deachapunya +2
We discuss Stark deflectometry of micro-modulated molecular beams for the enrichment of biomolecular isomers as well as single-wall carbon nanotubes and we demonstrate the working…
Experimental realization of a quantum game on a one-way quantum computer
Robert Prevedel, Andre Stefanov, Philip Walther +1
We report the first demonstration of a quantum game on an all-optical one-way quantum computer. Following a recent theoretical proposal we implement a quantum version of Prisoner's…
Experimental Demonstration of Decoherence-Free One-Way Information Transfer
R. Prevedel, M. S. Tame, A. Stefanov +3
We report the experimental demonstration of a one-way quantum protocol reliably operating in the presence of decoherence. Information is protected by designing an appropriate decoh…
Polarizability measurements in a molecule near-field interferometer
Martin Berninger, André Stefanov, Sarayut Deachapunya +1
We apply near-field matter-wave interferometry to determine the absolute scalar polarizability of the fullerenes C and C. A key feature of our experiment is the combi…
A scalable optical detection scheme for matter wave interferometry
Alexander Stibor, Andre Stefanov, Fabienne Goldfarb +2
Imaging of surface adsorbed molecules is investigated as a novel detection method for matter wave interferometry with fluorescent particles. Mechanically magnified fluorescence ima…
Quantum entanglement with acousto-optic modulators: 2-photon beatings and Bell experiments with moving beamsplitters
Andre Stefanov, Hugo Zbinden, Antoine Suarez +1
We present an experiment testing quantum correlations with frequency shifted photons. We test Bell inequality with 2-photon interferometry where we replace the beamsplitters by aco…
Quantum correlations versus Multisimultaneity: an experimental test
Andre Stefanov, Nicolas Gisin, Antoine Suarez +1
Multisimultaneity is a causal model of relativistic quantum physics which assigns a real time ordering to any set of events, much in the spirit of the pilot-wave picture. Contrary…
Photon counting for quantum key distribution with Peltier cooled InGaAs/InP APD's
Damien Stucki, Grégoire Ribordy, André Stefanov +3
The performance of three types of InGaAs/InP avalanche photodiodes is investigated for photon counting at 1550 nm in the temperature range of thermoelectric cooling. The best one y…