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  1. AU="Wolfe, Elie"
  2. AU="Le Thanh TUNG"
  3. AU=Onge Erin St.
  4. AU="Quiwa, Joseph C"
  5. AU="Maron, Jenny"
  6. AU="Padma Srikanth"
  7. AU="Carlsen, Sven Magnus"
  8. AU="Husseini, Fouad S"
  9. AU=Mihailescu Rita
  10. AU="Marrone, Anna-Claire"
  11. AU=Mills Caitlyn L.
  12. AU=Badawi Alaa
  13. AU="Genki Katata"
  14. AU="Kseniya Shuturminska"
  15. AU="Herzler, Matthias"
  16. AU=Godfrey W A
  17. AU="Jester, Rebecca"
  18. AU="Olivier Potvin"
  19. AU="Rombos, Antonis"
  20. AU="Kristiansson, Erik"
  21. AU="Tanous, Fadi"
  22. AU="Zeng, Fa-Min"
  23. AU="Kapusta, Andrzej"
  24. AU=Hebron Michaeline
  25. AU="Delfini, Ana Cláudia"
  26. AU="Barham, Lawrence"

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  1. Artikel ; Online: Linear Program for Testing Nonclassicality and an Open-Source Implementation.

    Selby, John H / Wolfe, Elie / Schmid, David / Sainz, Ana Belén / Rossi, Vinicius P

    Physical review letters

    2024  Band 132, Heft 5, Seite(n) 50202

    Abstract: A well-motivated method for demonstrating that an experiment resists any classical explanation is to show that its statistics violate generalized noncontextuality. We here formulate this problem as a linear program and provide an open-source ... ...

    Abstract A well-motivated method for demonstrating that an experiment resists any classical explanation is to show that its statistics violate generalized noncontextuality. We here formulate this problem as a linear program and provide an open-source implementation of it which tests whether or not any given prepare-measure experiment is classically explainable in this sense. The input to the program is simply an arbitrary set of quantum states and an arbitrary set of quantum effects; the program then determines if the Born rule statistics generated by all pairs of these can be explained by a classical (noncontextual) model. If a classical model exists, it provides an explicit model. If it does not, then it computes the minimal amount of noise that must be added such that a model does exist, and then provides this model. We generalize all these results to arbitrary generalized probabilistic theories (and accessible fragments thereof) as well; indeed, our linear program is a test of simplex embeddability as introduced in Schmid et al. [PRX Quantum 2, 010331 (2021).2691-339910.1103/PRXQuantum.2.010331] and generalized in Selby et al. [Phys. Rev. A 107, 062203 (2023).PLRAAN2469-992610.1103/PhysRevA.107.062203].
    Sprache Englisch
    Erscheinungsdatum 2024-02-16
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.132.050202
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  2. Artikel ; Online: Contextuality without Incompatibility.

    Selby, John H / Schmid, David / Wolfe, Elie / Sainz, Ana Belén / Kunjwal, Ravi / Spekkens, Robert W

    Physical review letters

    2023  Band 130, Heft 23, Seite(n) 230201

    Abstract: The existence of incompatible measurements is often believed to be a feature of quantum theory which signals its inconsistency with any classical worldview. To prove the failure of classicality in the sense of Kochen-Specker noncontextuality, one does ... ...

    Abstract The existence of incompatible measurements is often believed to be a feature of quantum theory which signals its inconsistency with any classical worldview. To prove the failure of classicality in the sense of Kochen-Specker noncontextuality, one does indeed require sets of incompatible measurements. However, a more broadly applicable notion of classicality is the existence of a generalized-noncontextual ontological model. In particular, this notion can imply constraints on the representation of outcomes even within a single nonprojective measurement. We leverage this fact to demonstrate that measurement incompatibility is neither necessary nor sufficient for proofs of the failure of generalized noncontextuality. Furthermore, we show that every proof of the failure of generalized noncontextuality in a quantum prepare-measure scenario can be converted into a proof of the failure of generalized noncontextuality in a corresponding scenario with no incompatible measurements.
    Sprache Englisch
    Erscheinungsdatum 2023-06-23
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.230201
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  3. Artikel ; Online: No Bipartite-Nonlocal Causal Theory Can Explain Nature's Correlations.

    Coiteux-Roy, Xavier / Wolfe, Elie / Renou, Marc-Olivier

    Physical review letters

    2021  Band 127, Heft 20, Seite(n) 200401

    Abstract: We show that some tripartite quantum correlations are inexplicable by any causal theory involving bipartite nonclassical common causes and unlimited shared randomness. This constitutes a device-independent proof that nature's nonlocality is fundamentally ...

    Abstract We show that some tripartite quantum correlations are inexplicable by any causal theory involving bipartite nonclassical common causes and unlimited shared randomness. This constitutes a device-independent proof that nature's nonlocality is fundamentally at least tripartite in every conceivable physical theory-no matter how exotic. To formalize this claim, we are compelled to substitute Svetlichny's historical definition of genuine tripartite nonlocality with a novel theory-agnostic definition tied to the framework of local operations and shared randomness. A companion article by Coiteux-Roy et al. generalizes these concepts to any N≥3 number of parties, providing experimentally amenable device-independent inequality constraints along with quantum correlations violating them, thereby certifying that nature's nonlocality must be boundlessly multipartite.
    Sprache Englisch
    Erscheinungsdatum 2021-12-03
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.127.200401
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  4. Artikel ; Online: Genuine Network Multipartite Entanglement.

    Navascués, Miguel / Wolfe, Elie / Rosset, Denis / Pozas-Kerstjens, Alejandro

    Physical review letters

    2021  Band 125, Heft 24, Seite(n) 240505

    Abstract: 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 notion is easy to hack: in fact, a source capable of distributing bipartite ... ...

    Abstract 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 notion is easy to hack: in fact, a source capable of distributing bipartite entanglement can, by itself, generate genuine k-partite entangled states for any k. We propose an alternative definition for genuine multipartite entanglement, whereby a quantum state is genuinely network k-entangled if it cannot be produced by applying local trace-preserving maps over several (k-1)-partite states distributed among the parties, even with the aid of global shared randomness. We provide analytic and numerical witnesses of genuine network entanglement, and we reinterpret many past quantum experiments as demonstrations of this feature.
    Sprache Englisch
    Erscheinungsdatum 2021-01-07
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.125.240505
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  5. Artikel ; Online: Certifying separability in symmetric mixed states of N qubits, and superradiance.

    Wolfe, Elie / Yelin, S F

    Physical review letters

    2014  Band 112, Heft 14, Seite(n) 140402

    Abstract: Separability criteria are typically of the necessary, but not sufficient, variety, in that satisfying some separability criterion, such as positivity of eigenvalues under partial transpose, does not strictly imply separability. Certifying separability ... ...

    Abstract Separability criteria are typically of the necessary, but not sufficient, variety, in that satisfying some separability criterion, such as positivity of eigenvalues under partial transpose, does not strictly imply separability. Certifying separability amounts to proving the existence of a decomposition of a target mixed state into some convex combination of separable states; determining the existence of such a decomposition is "hard." We show that it is effective to ask, instead, if the target mixed state "fits" some preconstructed separable form, in that one can generate a sufficient separability criterion relevant to all target states in some family by ensuring enough degrees of freedom in the preconstructed separable form. We demonstrate this technique by inducing a sufficient criterion for "diagonally symmetric" states of N qubits. A sufficient separability criterion opens the door to study precisely how entanglement is (not) formed; we use ours to prove that, counterintuitively, entanglement is not generated in idealized Dicke model superradiance despite its exemplification of many-body effects. We introduce a quantification of the extent to which a given preconstructed parametrization comprises the set of all separable states; for "diagonally symmetric" states our preconstruction is shown to be fully complete. This implies that our criterion is necessary in addition to sufficient, among other ramifications which we explore.
    Sprache Englisch
    Erscheinungsdatum 2014-04-11
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.112.140402
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  6. Artikel ; Online: Experimental nonclassicality in a causal network without assuming freedom of choice.

    Polino, Emanuele / Poderini, Davide / Rodari, Giovanni / Agresti, Iris / Suprano, Alessia / Carvacho, Gonzalo / Wolfe, Elie / Canabarro, Askery / Moreno, George / Milani, Giorgio / Spekkens, Robert W / Chaves, Rafael / Sciarrino, Fabio

    Nature communications

    2023  Band 14, Heft 1, Seite(n) 909

    Abstract: In a Bell experiment, it is natural to seek a causal account of correlations wherein only a common cause acts on the outcomes. For this causal structure, Bell inequality violations can be explained only if causal dependencies are modeled as intrinsically ...

    Abstract In a Bell experiment, it is natural to seek a causal account of correlations wherein only a common cause acts on the outcomes. For this causal structure, Bell inequality violations can be explained only if causal dependencies are modeled as intrinsically quantum. There also exists a vast landscape of causal structures beyond Bell that can witness nonclassicality, in some cases without even requiring free external inputs. Here, we undertake a photonic experiment realizing one such example: the triangle causal network, consisting of three measurement stations pairwise connected by common causes and no external inputs. To demonstrate the nonclassicality of the data, we adapt and improve three known techniques: (i) a machine-learning-based heuristic test, (ii) a data-seeded inflation technique generating polynomial Bell-type inequalities and (iii) entropic inequalities. The demonstrated experimental and data analysis tools are broadly applicable paving the way for future networks of growing complexity.
    Sprache Englisch
    Erscheinungsdatum 2023-02-17
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-36428-w
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  7. Buch ; Online: Entropic Inequality Constraints from $e$-separation Relations in Directed Acyclic Graphs with Hidden Variables

    Finkelstein, Noam / Zjawin, Beata / Wolfe, Elie / Shpitser, Ilya / Spekkens, Robert W.

    2021  

    Abstract: Directed acyclic graphs (DAGs) with hidden variables are often used to characterize causal relations between variables in a system. When some variables are unobserved, DAGs imply a notoriously complicated set of constraints on the distribution of ... ...

    Abstract Directed acyclic graphs (DAGs) with hidden variables are often used to characterize causal relations between variables in a system. When some variables are unobserved, DAGs imply a notoriously complicated set of constraints on the distribution of observed variables. In this work, we present entropic inequality constraints that are implied by $e$-separation relations in hidden variable DAGs with discrete observed variables. The constraints can intuitively be understood to follow from the fact that the capacity of variables along a causal pathway to convey information is restricted by their entropy; e.g. at the extreme case, a variable with entropy $0$ can convey no information. We show how these constraints can be used to learn about the true causal model from an observed data distribution. In addition, we propose a measure of causal influence called the minimal mediary entropy, and demonstrate that it can augment traditional measures such as the average causal effect.

    Comment: 18 pages. New in v3: Minor changes to the main text, substantial revisions to the proofs in Appendix C. We thank Robin Evans for motivating the most significant changes since v2
    Schlagwörter Statistics - Machine Learning ; Computer Science - Machine Learning
    Thema/Rubrik (Code) 006
    Erscheinungsdatum 2021-07-14
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  8. Artikel ; Online: Experimental Demonstration that No Tripartite-Nonlocal Causal Theory Explains Nature's Correlations.

    Cao, Huan / Renou, Marc-Olivier / Zhang, Chao / Massé, Gaël / Coiteux-Roy, Xavier / Liu, Bi-Heng / Huang, Yun-Feng / Li, Chuan-Feng / Guo, Guang-Can / Wolfe, Elie

    Physical review letters

    2022  Band 129, Heft 15, Seite(n) 150402

    Abstract: Quantum theory predicts the existence of genuinely tripartite-entangled states, which cannot be obtained from local operations over any bipartite-entangled states and unlimited shared randomness. Some of us recently proved that this feature is a ... ...

    Abstract Quantum theory predicts the existence of genuinely tripartite-entangled states, which cannot be obtained from local operations over any bipartite-entangled states and unlimited shared randomness. Some of us recently proved that this feature is a fundamental signature of quantum theory. The state |GHZ_{3}⟩=(|000⟩+|111⟩)/sqrt[2] gives rise to tripartite quantum correlations that cannot be explained by any causal theory limited to bipartite nonclassical common causes of any kind (generalizing entanglement) assisted with unlimited shared randomness. Hence, any conceivable physical theory that would reproduce quantum predictions will necessarily include genuinely tripartite resources. In this Letter, we verify that such tripartite correlations are experimentally achievable. We derive a new device-independent witness capable of falsifying causal theories wherein nonclassical resources are merely bipartite. Using a high-performance photonic |GHZ_{3}⟩ state with fidelities of 0.9741±0.002, we provide a clear experimental violation of that witness by more than 26.3 standard deviations, under the locality and fair sampling assumption. We generalize our Letter to the |GHZ_{4}⟩ state, obtaining correlations that cannot be explained by any causal theory limited to tripartite nonclassical common causes assisted with unlimited shared randomness.
    Sprache Englisch
    Erscheinungsdatum 2022-10-21
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.129.150402
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  9. Buch ; Online: Quantum Inflation

    Wolfe, Elie / Pozas-Kerstjens, Alejandro / Grinberg, Matan / Rosset, Denis / Acín, Antonio / Navascues, Miguel

    A General Approach to Quantum Causal Compatibility

    2019  

    Abstract: 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 correlations observed among some measured variables. While several methods ... ...

    Abstract 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 correlations observed among some measured variables. While several methods exist to characterize classical causal models, no general construction is known for the quantum case. In this work we present quantum inflation, a systematic technique to falsify if a given quantum causal model is compatible with some observed correlations. We demonstrate the power of the technique by reproducing known results and solving open problems for some paradigmatic examples of causal networks. Our results may find an application in many fields: from the characterization of correlations in quantum networks to the study of quantum effects in thermodynamic and biological processes.

    Comment: 24 pages, 19 figures. RevTeX 4.2. v2: New Section II with definition of device-independent quantum causal structures, rewritten Section V for more clarity, new Section VIII with application in quantum cryptography in networks, and new Appendix D
    Schlagwörter Quantum Physics ; Computer Science - Machine Learning
    Thema/Rubrik (Code) 115
    Erscheinungsdatum 2019-09-23
    Erscheinungsland us
    Dokumenttyp Buch ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

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  10. Artikel: Monte Carlo simulation of liquid bridge rupture: application to lung physiology.

    Alencar, Adriano M / Wolfe, Elie / Buldyrev, Sergey V

    Physical review. E, Statistical, nonlinear, and soft matter physics

    2006  Band 74, Heft 2 Pt 2, Seite(n) 26311

    Abstract: In the course of certain lung diseases, the surface properties and the amount of fluids coating the airways changes and liquid bridges may form in the small airways blocking the flow of air, impairing gas exchange. During inhalation, these liquid bridges ...

    Abstract In the course of certain lung diseases, the surface properties and the amount of fluids coating the airways changes and liquid bridges may form in the small airways blocking the flow of air, impairing gas exchange. During inhalation, these liquid bridges may rupture due to mechanical instability and emit a discrete sound event called pulmonary crackle, which can be heard using a simple stethoscope. We hypothesize that this sound is a result of the acoustical release of energy that had been stored in the surface of liquid bridges prior to its rupture. We develop a lattice gas model capable of describing these phenomena. As a step toward modeling this process, we address a simpler but related problem, that of a liquid bridge between two planar surfaces. This problem has been analytically solved and we use this solution as a validation of the lattice gas model of the liquid bridge rupture. Specifically, we determine the surface free energy and critical stability conditions in a system containing a liquid bridge of volume Omega formed between two parallel planes, separated by a distance 2h, with a contact angle Theta using both Monte Carlo simulation of a lattice gas model and variational calculus based on minimization of the surface area with the volume and the contact angle constraints. In order to simulate systems with different contact angles, we vary the parameters between the constitutive elements of the lattice gas. We numerically and analytically determine the phase diagram of the system as a function of the dimensionless parameters hOmega(-1/3) and Theta. The regions of this phase diagram correspond to the mechanical stability and thermodynamical stability of the liquid bridge. We also determine the conditions for the symmetrical versus asymmetrical rupture of the bridge. We numerically and analytically compute the release of free energy during rupture. The simulation results are in agreement with the analytical solution. Furthermore, we discuss the results in connection to the rupture of similar bridges that exist in diseased lungs.
    Sprache Englisch
    Erscheinungsdatum 2006-08
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ISSN 1539-3755
    ISSN 1539-3755
    DOI 10.1103/PhysRevE.74.026311
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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