Publications (34)
Enabling computation of correlation bounds for finite-dimensional quantum systems via symmetrisation
Armin Tavakoli, Denis Rosset, Marc-Olivier Renou
We present a technique for reducing the computational requirements by several orders of magnitude in the evaluation of semidefinite relaxations for bounding the set of quantum corr…
Possibilistic approach to network nonlocality
Antoine Restivo, Nicolas Brunner, Denis Rosset
The investigation of Bell nonlocality traditionally relies on joint probabilities of observing certain measurement outcomes. In this work we explore a possibilistic approach, where…
On the inequivalence of the CH and CHSH inequalities due to finite statistics
Marc-Olivier Renou, Denis Rosset, Anthony Martin +1
Different variants of a Bell inequality, such as CHSH and CH, are known to be equivalent when evaluated on nonsignaling outcome probability distributions. However, in experimental…
Noncommutative polynomial optimization under symmetry
Marie Ioannou, Denis Rosset
We present a general framework to exploit the symmetries present in the Navascu{é}s-Pironio-Ac{Ã}n semidefinite relaxations that approximate invariant noncommutative polynomial o…
Postquantum common-cause channels: the resource theory of local operations and shared entanglement
David Schmid, Haoxing Du, Maryam Mudassar +3
We define the type-independent resource theory of local operations and shared entanglement (LOSE). This allows us to formally quantify postquantumness in common-cause scenarios suc…
A resource theory of quantum memories and their faithful verification with minimal assumptions
Denis Rosset, Francesco Buscemi, Yeong-Cherng Liang
We provide a complete set of game-theoretic conditions equivalent to the existence of a transformation from one quantum channel into another one, by means of classically correlated…
Algebraic and geometric properties of local transformations
Denis Rosset, Ãmin Baumeler, Jean-Daniel Bancal +4
Some properties of physical systems can be characterized from their correlations. In that framework, subsystems are viewed as abstract devices that receive measurement settings as…
SymDPoly: symmetry-adapted moment relaxations for noncommutative polynomial optimization
Denis Rosset
Semidefinite relaxations are widely used to compute upper bounds on the objective of optimization problems involving noncommutative polynomials. Such optimization problems are prev…
Quantum Inflation: A General Approach to Quantum Causal Compatibility
Elie Wolfe, Alejandro Pozas-Kerstjens, Matan Grinberg +3
Causality is a seminal concept in science: Any research discipline, from sociology and medicine to physics and chemistry, aims at understanding the causes that could explain the co…
Mutually unbiased bases and symmetric informationally complete measurements in Bell experiments
Armin Tavakoli, Máté Farkas, Denis Rosset +2
Mutually unbiased bases (MUBs) and symmetric informationally complete projectors (SICs) are crucial to many conceptual and practical aspects of quantum theory. Here, we develop the…
Imperfect measurements settings: implications on quantum state tomography and entanglement witnesses
Denis Rosset, Raphael Ferretti-Schöbitz, Jean-Daniel Bancal +2
Reliable and well-characterized quantum resources are indispensable ingredients in quantum information processing. Typically, in a realistic characterization of these resources, ap…
Arbitrarily small amount of measurement independence is sufficient to manifest quantum nonlocality
Gilles Pütz, Denis Rosset, Tomer Jack Barnea +2
The use of Bell's theorem in any application or experiment relies on the assumption of free choice or, more precisely, measurement independence, meaning that the measurements can b…
Device-independent point estimation from finite data and its application to device-independent property estimation
Pei-Sheng Lin, Denis Rosset, Yanbao Zhang +2
The device-independent approach to physics is one where conclusions are drawn directly from the observed correlations between measurement outcomes. In quantum information, this app…
Universal bound on the cardinality of local hidden variables in networks
Denis Rosset, Nicolas Gisin, Elie Wolfe
We present an algebraic description of the sets of local correlations in arbitrary networks, when the parties have finite inputs and outputs. We consider networks generalizing the…
All entangled states display some hidden nonlocality
Yeong-Cherng Liang, Lluis Masanes, Denis Rosset
A well-known manifestation of quantum entanglement is that it may lead to correlations that are inexplicable within the framework of a locally causal theory --- a fact that is demo…
Measurement-Device-Independent Entanglement Witnesses for All Entangled Quantum States
Cyril Branciard, Denis Rosset, Yeong-Cherng Liang +1
The problem of demonstrating entanglement is central to quantum information processing applications. Resorting to standard entanglement witnesses requires one to perfectly trust th…
Regularising data for practical randomness generation
Boris Bourdoncle, Pei-Sheng Lin, Denis Rosset +2
Non-local correlations that obey the no-signalling principle contain intrinsic randomness. In particular, for a specific Bell experiment, one can derive relations between the amoun…
Measurement Device Independent Verification of Quantum Channels
Francesco Graffitti, Alexander Pickston, Peter Barrow +5
The capability to reliably transmit and store quantum information is an essential building block for future quantum networks and processors. Gauging the ability of a communication…
Bilocal versus non-bilocal correlations in entanglement swapping experiments
Cyril Branciard, Denis Rosset, Nicolas Gisin +1
Entanglement swapping is a process by which two initially independent quantum systems can become entangled and generate nonlocal correlations. To characterize such correlations, we…
Family of Bell-like inequalities as device-independent witnesses for entanglement depth
Yeong-Cherng Liang, Denis Rosset, Jean-Daniel Bancal +3
We present a simple family of Bell inequalities applicable to a scenario involving arbitrarily many parties, each of which performs two binary-outcome measurements. We show that th…
Self-testing quantum states and measurements in the prepare-and-measure scenario
Armin Tavakoli, JÄdrzej Kaniewski, Tamás Vértesi +2
The goal of self-testing is to characterize an a priori unknown quantum system based solely on measurement statistics, i.e. using an uncharacterized measurement device. Here we dev…
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…
Receiver-Device-Independent Quantum Key Distribution Protocols
Marie Ioannou, Pavel Sekatski, Alastair A. Abbott +3
We discuss quantum key distribution protocols and their security analysis, considering a receiver-device-independent (RDI) model. The sender's (Alice's) device is partially charact…
Nonlinear Bell inequalities tailored for quantum networks
Denis Rosset, Cyril Branciard, Tomer Jack Barnea +3
In a quantum network, distant observers sharing physical resources emitted by independent sources can establish strong correlations, which defy any classical explanation in terms o…
Type-independent Characterization of Spacelike Separated Resources
Denis Rosset, David Schmid, Francesco Buscemi
Quantum theory describes multipartite objects of various types: quantum states, nonlocal boxes, steering assemblages, teleportages, distributed measurements, channels, and so on. S…
RepLAB: a computational/numerical approach to representation theory
Denis Rosset, Felipe Montealegre-Mora, Jean-Daniel Bancal
We present a MATLAB/Octave toolbox to decompose finite dimensionial representations of compact groups. Surprisingly, little information about the group and the representation is ne…
Classical simulation of entanglement swapping with bounded communication
Cyril Branciard, Nicolas Brunner, Harry Buhrman +5
Entanglement appears under two different forms in quantum theory, namely as a property of states of joint systems and as a property of measurement eigenstates in joint measurements…
Correlations of entangled quantum states cannot be classically simulated
Denis Rosset, Cyril Branciard, Nicolas Gisin +1
Simulation tasks are insightful tools to compare information-theoretic resources. Considering a generalization of usual Bell scenarios where external quantum inputs are provided to…
Communication cost of simulating entanglement swapping
Nicolas Brunner, Cyril Branciard, Nicolas Gisin +1
Entanglement appears in two different ways in quantum mechanics, namely as a property of states and as a property of measurement outcomes in joint measurements. By combining these…
Genuine Network Multipartite Entanglement
Miguel Navascues, Elie Wolfe, Denis Rosset +1
The standard definition of genuine multipartite entanglement stems from the need to assess the quantum control over an ever-growing number of quantum systems. We argue that this no…
The type-independent resource theory of local operations and shared randomness
David Schmid, Denis Rosset, Francesco Buscemi
In space-like separated experiments and other scenarios where multiple parties share a classical common cause but no cause-effect relations, quantum theory allows a variety of nons…
Classifying 50 years of Bell inequalities
Denis Rosset, Jean-Daniel Bancal, Nicolas Gisin
Since John S. Bell demonstrated the interest of studying linear combinations of probabilities in relation with the EPR paradox in 1964, Bell inequalities have lead to numerous deve…
Certifying Numerical Decompositions of Compact Group Representations
Felipe Montealegre-Mora, Denis Rosset, Jean-Daniel Bancal +1
We present a performant and rigorous algorithm for certifying that a matrix is close to being a projection onto an irreducible subspace of a given group representation. This addres…
Practical measurement-device-independent entanglement quantification
Denis Rosset, Anthony Martin, Ephanielle Verbanis +2
The robust estimation of entanglement is key to the validation of implementations of quantum systems. On the one hand, the evaluation of standard entanglement measures, either usin…