244 citations · 1.3k across the 27 of their papers we have counts for
27 papers
Uncountably many inequivalent maximally entangled measurements for two qutrits
Elna Svegborn, Jef Pauwels, Nicolas Gisin +1
Every two-qubit measurement basis composed of maximally entangled eigenstates can be transformed into the Bell basis via local unitary operations. For higher dimensions, in contras…
Symmetric Localizable Multipartite Quantum Measurements from Pauli Orbits
Jef Pauwels, Cyril Branciard, Alejandro Pozas-Kerstjens +1
While the structure of entangled quantum states is relatively well understood, the characterization of entangled measurements, especially in multipartite and high-dimensional setti…
Local models and Bell inequalities for the minimal triangle network
José Mário da Silva, Alejandro Pozas-Kerstjens, Fernando Parisio
Nonlocal correlations created in networks with multiple independent sources enable surprising phenomena in quantum information and quantum foundations. The presence of independent…
Symmetric observations without symmetric causal explanations
Christian William, Patrick Remy, Jean-Daniel Bancal +3
Inferring causal models from observed correlations is a challenging task, crucial to many areas of science. In order to alleviate the computational effort when sifting through poss…
Classification of joint quantum measurements based on entanglement cost of localization
Jef Pauwels, Alejandro Pozas-Kerstjens, Flavio Del Santo +1
Despite their importance in quantum theory, joint quantum measurements remain poorly understood. An intriguing conceptual and practical question is whether joint quantum measuremen…
Semidefinite programming relaxations for quantum correlations
Armin Tavakoli, Alejandro Pozas-Kerstjens, Peter Brown +1
Semidefinite programs are convex optimisation problems involving a linear objective function and a domain of positive semidefinite matrices. Over the last two decades, they have be…
Hierarchical certification of nonclassical network correlations
Ming-Xing Luo, Xue Yang, Alejandro Pozas-Kerstjens
With the increased availability of quantum technological devices, it becomes more important to have tools to guarantee their correct nonclassical behavior. This is especially impor…
Post-quantum nonlocality in the minimal triangle scenario
Alejandro Pozas-Kerstjens, Antoine Girardin, Tamás Kriváchy +2
We investigate network nonlocality in the triangle scenario when all three parties have no input and binary outputs. Through an explicit example, we prove that this minimal scenari…
Bell inequalities with overlapping measurements
Moisés Bermejo Morán, Alejandro Pozas-Kerstjens, Felix Huber
Which nonlocal correlations can be obtained, when a party has access to more than one subsystem? While traditionally nonlocality deals with spacelike separated parties, this questi…
Experimental full network nonlocality with independent sources and strict locality constraints
Xue-Mei Gu, Liang Huang, Alejandro Pozas-Kerstjens +10
Nonlocality arising in networks composed of several independent sources gives rise to phenomena radically different from that in standard Bell scenarios. Over the years, the phenom…
Certification of non-classicality in all links of a photonic star network without assuming quantum mechanics
Ning-Ning Wang, Alejandro Pozas-Kerstjens, Chao Zhang +6
Networks composed of independent sources of entangled particles that connect distant users are a rapidly developing quantum technology and an increasingly promising test-bed for fu…
A didactic approach to quantum machine learning with a single qubit
Elena Peña Tapia, Giannicola Scarpa, Alejandro Pozas-Kerstjens
This paper presents, via an explicit example with a real-world dataset, a hands-on introduction to the field of quantum machine learning (QML). We focus on the case of learning wit…
Inflation: a Python library for classical and quantum causal compatibility
Emanuel-Cristian Boghiu, Elie Wolfe, Alejandro Pozas-Kerstjens
We introduce Inflation, a Python library for assessing whether an observed probability distribution is compatible with a causal explanation. This is a central problem in both theor…
Proofs of network quantum nonlocality in continuous families of distributions
Alejandro Pozas-Kerstjens, Nicolas Gisin, Marc-Olivier Renou
The study of nonlocality in scenarios that depart from the bipartite Einstein-Podolsky-Rosen setup is allowing to uncover many fundamental features of quantum mechanics. Recently,…
Single-photon nonlocality in quantum networks
Paolo Abiuso, Tamás Kriváchy, Emanuel-Cristian Boghiu +3
The state obtained when a single photon impinges on a balanced beamsplitter is often known as single-photon entangled and its nonlocal properties have been the subject of intense d…
Full network nonlocality
Alejandro Pozas-Kerstjens, Nicolas Gisin, Armin Tavakoli
Networks have advanced the study of nonlocality beyond Bell's theorem. Here, we introduce the concept of full network nonlocality, which describes correlations that necessitate all…
Bell nonlocality in networks
Armin Tavakoli, Alejandro Pozas-Kerstjens, Ming-Xing Luo +1
Bell's theorem proves that quantum theory is inconsistent with local physical models. It has propelled research in the foundations of quantum theory and quantum information science…
Defence against adversarial attacks using classical and quantum-enhanced Boltzmann machines
Aidan Kehoe, Peter Wittek, Yanbo Xue +1
We provide a robust defence to adversarial attacks on discriminative algorithms. Neural networks are naturally vulnerable to small, tailored perturbations in the input data that le…
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…
Efficient training of energy-based models via spin-glass control
Alejandro Pozas-Kerstjens, Gorka Muñoz-Gil, Eloy Piñol +4
We introduce a new family of energy-based probabilistic graphical models for efficient unsupervised learning. Its definition is motivated by the control of the spin-glass propertie…
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…
Bounding the sets of classical and quantum correlations in networks
Alejandro Pozas-Kerstjens, Rafael Rabelo, Łukasz Rudnicki +4
We present a method that allows the study of classical and quantum correlations in networks with causally-independent parties, such as the scenario underlying entanglement swapping…
Bayesian Deep Learning on a Quantum Computer
Zhikuan Zhao, Alejandro Pozas-Kerstjens, Patrick Rebentrost +1
Bayesian methods in machine learning, such as Gaussian processes, have great advantages com-pared to other techniques. In particular, they provide estimates of the uncertainty asso…
A quantum Otto engine with finite heat baths: energy, correlations, and degradation
Alejandro Pozas-Kerstjens, Eric G. Brown, Karen V. Hovhannisyan
We study a driven harmonic oscillator operating an Otto cycle between two thermal baths of finite size. By making extensive use of the tools of Gaussian quantum mechanics, we direc…