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Causalworlds

Sep 16 – 20, 2024
Perimeter Institute for Theoretical Physics
America/Toronto timezone

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Contribution List

65 out of 65 displayed
  1. 12. OPENING REMARKS
    9/16/24, 9:00 AM
    Conference Event
  2. 13. Tutorial: Causal Inference Meets Quantum Physics
    Robert Spekkens (Perimeter Institute)
    9/16/24, 9:20 AM
    Tutorial

    Can the effectiveness of a medical treatment be determined without the expense of a randomized controlled trial? Can the impact of a new policy be disentangled from other factors that happen to vary at the same time? Questions such as these are the purview of the field of causal inference, a general-purpose science of cause and effect, applicable in domains ranging from epidemiology to...

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  3. 14. Counterfactual and Graphical Frameworks for Causal Modeling
    Thomas Richardson (University of Washington)
    9/16/24, 10:50 AM
    Conference Talk

    In the Statistics literature there are three main frameworks for causal modeling: counterfactuals (aka potential outcomes), non-parametric structural equation models (NPSEMs) and graphs (aka path diagrams or causal Bayes nets). These approaches are similar and, in certain specific respects, equivalent. However, there are important conceptual differences and each formulation has its own...

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  4. 15. Bipartite graphical causal models: beyond causal Bayesian networks and structural causal models
    Joris M. Mooij (University of Amsterdam)
    9/16/24, 11:30 AM
    Conference Talk

    Based on the immense popularity of causal Bayesian networks and structural causal models, one might expect that these representations are appropriate to describe the causal semantics of any real-world system, at least in principle. In this talk, I will argue that this is not the case, and motivate the study of more general causal modeling frameworks. In particular, I will discuss bipartite...

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  5. 46. Modeling Latent Selection with Structural Causal Models
    Leihao Chen (University of Amsterdam, Korteweg-de Vries Institute for Mathematics)
    9/16/24, 1:45 PM
    Contributed Talk
    Session A
  6. 55. Relating Wigner's Friend Scenarios to Nonclassical Causal Compatibility, Monogamy Relations, and Fine Tuning
    Yìlè Yīng (Perimeter Institute for Theoretical Physics)
    9/16/24, 1:45 PM
    Contributed Talk
    Session B
  7. 34. A quantum circuit framework for extended Wigner's friend scenarios: logical and causal reasoning without objective events
    V. Vilasini (ETH Zürich and Inria University Grenoble Alpes)
    9/16/24, 2:10 PM
    Contributed Talk
    Session B
  8. 64. Zero Inflation as a Missing Data Problem: a Proxy-based Approach
    Trung Phung (Johns Hopkins Whiting School of Engineering)
    9/16/24, 2:10 PM
    Contributed Talk
    Session A
  9. 42. Emergent classicality, relativistic causality, and quantum causal structure
    Nick Ormrod (University of Oxford)
    9/16/24, 2:35 PM
    Contributed Talk
    Session B
  10. 40. Which causal scenarios might support non-classical correlations?
    Shashaank Khanna (University of York)
    9/16/24, 2:35 PM
    Contributed Talk
    Session A
  11. 67. Generalized tensors and partial traces over quantum networks
    Pablo Arrighi (Université Paris-Sarclay and Inria)
    9/16/24, 3:45 PM
    Flash Talk
    Flash Talks
  12. 71. The Elegant Joint Measurement is nonlocal in the triangle network
    Victor Gitton (ETH Zurich)
    9/16/24, 3:52 PM
    Flash Talk
    Flash Talks
  13. 70. Subsystem decompositions of quantum circuits and transformations between causal perspectives
    Julian Wechs (Université Libre de Bruxelles)
    9/16/24, 3:59 PM
    Flash Talk
    Flash Talks
  14. 76. Paraconsistency of relativistic nonsignalling, and some other features of causal spectral toposes
    Ryszard Paweł Kostecki (University of Gdańsk)
    9/16/24, 4:06 PM
    Flash Talk
    Flash Talks
  15. 74. Everything that can be learned about a causal structure with latent variables by observational and interventional probing schemes
    Marina Maciel Ansanelli (Perimeter Institute)
    9/16/24, 4:13 PM
    Flash Talk
    Flash Talks
  16. 66. From Locality to Causality in the Heisenberg Picture
    Charles Alexandre Bédard (Università della Svizzera Italiana)
    9/16/24, 4:20 PM
    Flash Talk
    Flash Talks
  17. 69. Self-testing quantum supermaps, with an application to the quantum switch
    Alastair Abbott (Inria Grenoble)
    9/16/24, 4:27 PM
    Flash Talk
    Flash Talks
  18. 68. Higher-order Quantum Processes are Characterized by the Logic of their Signaling Relations
    Timothée Hoffreumon (Université Paris-Saclay)
    9/16/24, 4:34 PM
    Flash Talk
    Flash Talks
  19. 65. Cluster Decomposition and Two Senses of Isolability
    Michael Miller (University of Toronto)
    9/16/24, 4:41 PM
    Flash Talk
    Flash Talks
  20. 73. The geometry of spacetime from quantum measurements
    Tales Rick Perche (Perimeter Institute)
    9/16/24, 4:48 PM
    Flash Talk
    Flash Talks
  21. 16. Tutorial - Indefinite quantum causality
    Cyril Branciard (Institut Néel - CNRS)
    9/17/24, 9:00 AM
    Tutorial

    Recent advances in quantum foundations have unveiled the idea that the causal order between quantum events may not always be fixed or even well-defined, allowing for some form of indefinite quantum causality. This tutorial will introduce the key concepts and motivations behind this rapidly developing area of research. Focusing on one of the main frameworks developed to explore indefinite...

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  22. 17. Indefinite causal order and the arrow of time
    Giulio Chiribella (University of Hong Kong)
    9/17/24, 10:50 AM
    Conference Talk

    At the fundamental level, the dynamics of quantum particles and fields is time-symmetric: their dynamical equations are invariant under inversion of the time coordinate, possibly in conjunction with the change of other physical properties, such as charge and parity. At the operational level, the time-symmetry of the fundamental equations implies that certain quantum devices are bidirectional,...

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  23. 27. Can the quantum switch be deterministically simulated?
    Jessica Bavaresco (University of Geneva)
    9/17/24, 11:30 AM
    Conference Talk

    Higher-order transformations that act on a certain number of input quantum channels with an indefinite causal order, such as the quantum switch, cannot be described by standard quantum circuits that use the same number of calls of the input quantum channels. But could they be simulated, i.e., could their action on their input channels be deterministically reproduced, for all arbitrary inputs,...

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  24. 48. Generalizing Bell non locality without global causal constraints
    Ravi Kunjwal (Aix-Marseille University)
    9/17/24, 1:45 PM
    Contributed Talk
    Session B
  25. 63. What, in the world, is a violation of causal faithfulness?
    Patrick Fraser (University of Toronto)
    9/17/24, 1:45 PM
    Contributed Talk
    Session A
  26. 39. Classical causal models in string diagrams
    Robin Lorenz (Quantinuum)
    9/17/24, 2:10 PM
    Contributed Talk
    Session A
  27. 61. Tsirelson bounds for quantum correlations with indefinite causal order
    Zixuan Liu (The University of Hong Kong)
    9/17/24, 2:10 PM
    Contributed Talk
    Session B
  28. 41. Correlations and quantum circuits with dynamical causal order
    Raphaël Mothe (Institut Néel, CNRS)
    9/17/24, 2:35 PM
    Contributed Talk
    Session B
  29. 77. Identifying classical Markovian causal models from generalized observation
    Isaac Friend (University of Oxford)
    9/17/24, 2:35 PM
    Contributed Talk
    Session A
  30. 37. Causally faithful unitary circuit decompositions
    Tein van der Lugt (University of Oxford)
    9/17/24, 3:45 PM
    Contributed Talk
    Session A
  31. 54. Quantum reference frames, measurement schemes and the type of local algebras in quantum field theory
    Daan Janssen (University of York)
    9/17/24, 3:45 PM
    Contributed Talk
    Session B
  32. 43. Fighting non-locality with non-locality: microcausality and boundary conditions in QED
    Joshua Kirklin
    9/17/24, 4:10 PM
    Contributed Talk
    Session B
  33. 50. Partitions in quantum theory, and causal decompositions of 1D Quantum Cellular Automata
    Augustin Vanrietvelde (Télécom Paris)
    9/17/24, 4:10 PM
    Contributed Talk
    Session A
  34. 36. Causality of meaning in compositional language models (an invitation to collaborate)
    Bob Coecke
    9/17/24, 4:35 PM
    Contributed Talk
    Session A
  35. 53. Quantum Permutations as Quantum Coordinate Transformations
    Ofek Bengyat (Institute for Quantum Optics and Quantum Information - Vienna)
    9/17/24, 4:35 PM
    Contributed Talk
    Session B
  36. 19. Quantum algorithms for classical causal learning
    Sally Shrapnel (University of Queensland)
    9/18/24, 9:00 AM
    Conference Talk

    Given the large number of proposed quantum machine learning (QML) algorithms, it is somewhat surprising that ideas from this field have not yet been extended to causal learning. While deep learning and generative machine learning models have taken centre stage in the industrial application of automated learning on classical data, it is nonetheless well known that these techniques don't...

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  37. 20. Nonlocality via Constrained Colliders
    Huw Price (Trinity College, Cambridge)
    9/18/24, 9:40 AM

    We propose that Bell correlations are explicable as a combination of (i) collider bias and (ii) a boundary constraint on the collider variable. We show that the proposal is valid for a special class of ('W-shaped') Bell experiments involving delayed-choice entanglement swapping, and argue that it can be extended to the ordinary ('V-shaped') case. The proposal requires no direct causal...

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  38. 21. Joint measurements on distant physical systems
    Alejandro Pozas-Kerstjens (Université de Genève)
    9/18/24, 10:50 AM
    Conference Talk

    It is not explicitly obvious that relativity and quantum mechanics are consistent with each other. Extensive research has shown that quantum states are consistent with relativity, in that they do not allow for faster-than-light transferring of information. In contrast, much less research has been done in quantum measurements, and in fact, naive attempts to put together relativity and quantum...

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  39. 22. Colloquium - Causal and counterfactual inference and what they're good for
    Ciarán Gilligan-Lee (Spotify)
    9/18/24, 2:00 PM
    Colloquium

    Causal reasoning is vital for effective reasoning in many domains, from healthcare to economics. In medical diagnosis, for example, a doctor aims to explain a patient’s symptoms by determining the diseases causing them. This is because causal relations, unlike correlations, allow one to reason about the consequences of possible treatments and to answer counterfactual queries. In this talk I...

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  40. 51. QUANTUM LATENTS: DISTINGUISHING CAUSAL SCENARIOS WITH INDISTINGUISHABLE CLASSICAL ANALOGS
    Daniel Centeno Díaz
    9/18/24, 3:45 PM
    Contributed Talk
    Session A
  41. 57. Routing Quantum Control of Causal Order
    Maarten Grothus (Inria Grenoble)
    9/18/24, 3:45 PM
    Contributed Talk
    Session B
  42. 32. Cyclic causal modelling with a graph separation property in classical and quantum theories
    Carla Ferradini (Institute for Theoretical Physics, ETH Zurich)
    9/18/24, 4:10 PM
    Contributed Talk
    Session A
  43. 58. Simulating the quantum switch using causally ordered circuits requires at least an exponential overhead in query complexity
    Hlér Kristjánsson (Perimeter Institute & IQC)
    9/18/24, 4:10 PM
    Contributed Talk
    Session B
  44. 35. A Semantics for Counterfactuals in Quantum Causal Models
    Eric Cavalcanti (Griffith University)
    9/18/24, 4:35 PM
    Contributed Talk
    Session A
  45. 59. Knot invariants and indefinite causal order
    Samuel Fedida (University of Cambridge)
    9/18/24, 4:35 PM
    Contributed Talk
    Session B
  46. 23. Quantum non-causality in spacetime may be not exclusively quantum
    Rainer Verch (University of Leipzig)
    9/19/24, 9:00 AM
    Conference Talk

    There are several non-causal effects that have been attributed to quantum physics. These include the analogues of "closed timelike curve effects" in quantum circuits proposed by David Deutsch (D-CTC), and the "impossible measurements" in relativistic quantum field theory discussed by Raphael Sorkin. Based on previous work, it will be pointed out in the talk that the alleged non-causality...

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  47. 24. Quantum discreteness and spacetime causality: what's in the mix?
    Sumati Surya (Raman Research Institute)
    9/19/24, 9:40 AM
    Conference Talk

    The notion of causality is intimately tied to both, a transitive ordering on events, and the possibility of unrelated events. Thus, any causality structure is a partially ordered set or poset. This is the case in Lorentzian spacetime, which possesses a single time direction. In causal set quantum gravity, this spacetime causality structure is "first quantised" by discretising it. However,...

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  48. 25. Relativistic causality principles in QFT
    Doreen Fraser (University of Waterloo)
    9/19/24, 10:50 AM
    Conference Talk

    In QFT, one aspect of relativistic causality is the principle of microcausality, which requires that observables associated with spacelike separated regions commute. But this principle is not by itself sufficient to rule out superluminal signalling, as examples of ‘impossible’ measurements demonstrate. Representations of the dynamics that respect relativity also play a necessary role in...

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  49. 26. Enhancing Non-Classicality Detection with Interventions
    Rafael Chaves (International Institute of Physics (IIP-UFRN))
    9/19/24, 11:30 AM
    Conference Talk

    Generalizations of Bell's theorem, particularly within quantum networks, are now being analyzed through the causal inference lens. However, the use of interventions, a central concept in causality theory, remains unexplored. As will be discussed, if we are not limited to observational data and can intervene in our experimental setup, we can witness quantum violations of classical causal bounds...

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  50. 60. Towards Relational Quantum Field Theory
    Jan Głowacki (University of Oxford)
    9/19/24, 3:45 PM
    Contributed Talk
    Session B
  51. 62. Two convergent NPA-like hierarchies for the quantum bilocal scenario
    Xiangling Xu (Inria Saclay Île-de-France)
    9/19/24, 3:45 PM
    Contributed Talk
    Session A
  52. 47. Escaping the Shadow of Bell’s Theorem in Network Nonlocality
    Maria Ciudad Alañón
    9/19/24, 4:10 PM
    Contributed Talk
    Session A
  53. 45. Making Sense of Relativistic Causality Conditions
    Wayne Myrvold (University of Western Ontario)
    9/19/24, 4:10 PM
    Contributed Talk
    Session B
  54. 49. Observational-Interventional Bell Inequalities
    Davide Poderini (International Institute of Physics, UFRN, Natal)
    9/19/24, 4:35 PM
    Contributed Talk
    Session A
  55. 56. Relativistic Concepts in Point-Free Spaces
    Nesta van der Schaaf (The University of Edinburgh)
    9/19/24, 4:35 PM
    Contributed Talk
    Session B
  56. 75. Business Meeting - Future of Causalworlds (Optional)
    9/19/24, 5:15 PM
    Conference Event
  57. 18. Higher-order quantum computation and causality
    Mio Murao (The University of Tokyo)
    9/20/24, 9:00 AM
    Conference Talk

    Supermaps are higher-order transformations that take maps as input. We explore quantum algorithms that implement supermaps of unitary operations using multiple calls to a black-box unitary operation. We investigate how the causal structure and spacetime symmetry of these unitary black-boxes affect their performance in implementing higher-order quantum operations. We analyze several tasks,...

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  58. 28. Causally faithful circuits for relativistic realisability, or: What can you do in a spacetime?
    Tein van der Lugt (University of Oxford)
    9/20/24, 9:40 AM
    Conference Talk

    Multipartite quantum channels realisable in a spacetime obey the no-superluminal-signalling constraints imposed by relativistic causality. But what about the converse: Can every channel that exhibits no superluminal signalling also be realised through relativistically valid dynamics? To our knowledge, only special cases of this question have been studied. For bipartite channels, the answer has...

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  59. 29. Indefinite causal order and quantum reference frames
    Anne-Catherine de la Hamette (University of Vienna / IQOQI Vienna)
    9/20/24, 10:50 AM
    Conference Talk

    Recent research on quantum reference frames (QRFs) has shown that whether a system is in a superposed state of locations, momenta, and other properties can depend on the quantum reference frame relative to which it is being described. Whether an event is localized in spacetime or not can change under QRF transformations, in that case so-called quantum-controlled diffeomorphisms. This raises a...

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  60. 30. Fundamental limits for realising quantum processes in spacetime
    Renato Renner (ETH Zurich)
    9/20/24, 11:30 AM
    Conference Talk

    Causality is a core concept in both General Relativity (GR) and Quantum Information Theory (QIT), yet it manifests differently in each domain. In GR, causal cones appear as a defining property of spacetime. Conversely, in QIT, causality relates to the abstract flow of information in quantum processes, independent of spacetime. This raises a crucial question: under what conditions can an...

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  61. 33. A decompositional framework for process theories in spacetime
    Matthias Salzger (ICTQT, University of Gdansk)
    9/20/24, 3:45 PM
    Contributed Talk
    Session B
  62. 52. Quantum non-classicality in the simplest causal network
    Pedro Lauand (University of Campinas)
    9/20/24, 3:45 PM
    Contributed Talk
    Session A
  63. 38. Characterizing Signalling: Connections between Causal Inference and Space-time Geometry
    Maarten Grothus (Inria Grenoble)
    9/20/24, 4:10 PM
    Contributed Talk
    Session B
  64. 44. Limitations of causal models of the triangle network, in the symmetric subspace and beyond
    Tamás Kriváchy (ICFO, The Institute of Photonic Sciences (Barcelona))
    9/20/24, 4:10 PM
    Contributed Talk
    Session A
  65. 31. CLOSING REMARKS
    9/20/24, 4:35 PM
    Conference Event