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- Roman Schmied, Jean-Daniel Bancal, +4 authors Nicolas Sangouard
- Science
- 2016

Characterizing many-body systems through the quantum correlations between their constituent particles is a major goal of quantum physics. Although entanglement is routinely observed in many systems, we report here the detection of stronger correlations--Bell correlations--between the spins of about 480 atoms in a Bose-Einstein condensate. We derive a Bell… (More)

- Mafalda L Almeida, Jean-Daniel Bancal, Nicolas Brunner, Antonio Acín, Nicolas Gisin, Stefano Pironio
- Physical review letters
- 2010

We present a multipartite nonlocal game in which each player must guess the input received by his neighbor. We show that quantum correlations do not perform better than classical ones at this game, for any prior distribution of the inputs. There exist, however, input distributions for which general no-signaling correlations can outperform classical and… (More)

- Tzyh Haur Yang, Tamás Vértesi, Jean-Daniel Bancal, Valerio Scarani, Miguel Navascués
- Physical review letters
- 2014

Self-testing refers to the fact that, in some quantum devices, both states and measurements can be assessed in a black-box scenario, on the sole basis of the observed statistics, i.e., without reference to any prior device calibration. Only a few examples of self-testing are known, and they just provide nontrivial assessment for devices performing… (More)

Reproducing with elementary resources the correlations that arise when a quantum system is measured (quantum state simulation), allows one to get insight on the operational and computational power of quantum correlations. We propose a family of models that can simulate von Neumann measurements in the x−y plane of the Bloch sphere on n-partite GHZ states.

- Olivier Morin, Jean-Daniel Bancal, +5 authors Nicolas Sangouard
- Physical review letters
- 2013

Single-photon entangled states, i.e., states describing two optical paths sharing a single photon, constitute the simplest form of entanglement. Yet they provide a valuable resource in quantum information science. Specifically, they lie at the heart of quantum networks, as they can be used for quantum teleportation, swapped, and purified with linear optics.… (More)

- Jean-Daniel Bancal, Nicolas Gisin, Yeong-Cherng Liang, Stefano Pironio
- Physical review letters
- 2011

We consider the problem of determining whether genuine multipartite entanglement was produced in an experiment, without relying on a characterization of the systems observed or of the measurements performed. We present an n-partite inequality that is satisfied by all correlations produced by measurements on biseparable quantum states, but which can be… (More)

- Antonio Acín, Nicolas Brunner, +8 authors Scarani andTVidick
- 2016

- Tobias Moroder, Jean-Daniel Bancal, Yeong-Cherng Liang, Martin Hofmann, Otfried Gühne
- Physical review letters
- 2013

We present a general method to quantify both bipartite and multipartite entanglement in a device-independent manner, meaning that we put a lower bound on the amount of entanglement present in a system based on the observed data only but independent of any quantum description of the employed devices. Some of the bounds we obtain, such as for the… (More)

- Jean-Daniel Bancal, Cyril Branciard, Nicolas Gisin, Stefano Pironio
- Physical review letters
- 2009

The nonlocal correlations of multipartite entangled states can be reproduced by a classical model if sufficiently many parties join together or if sufficiently many parties broadcast their measurement inputs. The maximal number m of groups and the minimal number k of broadcasting parties that allow for the reproduction of a given set of correlations… (More)

- Jean-Daniel Bancal, Nicolas Brunner, Nicolas Gisin, Yeong-Cherng Liang
- Physical review letters
- 2011

The structure of Bell-type inequalities detecting genuine multipartite nonlocality, and hence detecting genuine multipartite entanglement, is investigated. We first present a simple and intuitive approach to Svetlichny's original inequality, which provides a clear understanding of its structure and of its violation in quantum mechanics. Based on this… (More)