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2026 Theory Canada 18

19–20 Jun 2026
Université de Montréal (MIL campus)
Canada/Central timezone

Simon Caron-Huot

Session

Quantum Information

QInfo
19 Jun 2026, 09:45
A-4502.1 (Université de Montréal (MIL campus))

A-4502.1

Université de Montréal (MIL campus)

1375 Avenue Thérèse-Lavoie-Roux, Montréal (QC) H2V 0B3

Presentation materials

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  1. 46. Photon-number cumulants of Gaussian states
    Yanic Cardin (Polytechnique Montréal)
    19/06/2026, 09:45
    Quantum Information
    Contributed Talk

    Gaussian Boson Sampling (GBS) is a leading model of sub-universal quantum computation realizable with current photonic technologies. Despite recent experimental progress, the validation of GBS devices remains an open problem. In this talk, I present results on the asymptotic behavior of photon-number cumulants of multimode Gaussian states and discuss how these quantities can be used as...

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  2. 59. Perspective on quantum clocks
    Mrs Kobra Mahdavipour (Institute for Quantum Science and Technology, University of Calgary)
    19/06/2026, 10:05
    Quantum Information
    Contributed Talk

    We aim to introduce an operational definition of a clock as a physical system and elucidate what
    makes a clock quantum in nature. We proceed by introducing an architectural framework for a
    clock, which comprises a driver, an oscillator, a frequency reference, a readout, and a stabilizer. We
    then apply our framework to three realizations, namely mechanical, atomic, and...

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  3. 78. Hybrid Quantum-Classical Neural Networks with a Fermionic Layer
    Ayana Sarkar (Universite de Sherbrooke)
    19/06/2026, 10:25
    Quantum Information
    Contributed Talk

    We introduce a hybrid quantum-classical neural network whose quantum layer is based on the paradigm of fermionic quantum computing. This model broadens the scope of fermionic machine learning (FermiML) introduced in [arXiv:2404.19032] by extending its applicability to a wider range of learning tasks. Since fermionic quantum circuits are efficiently simulable classically in polynomial time, our...

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  4. 90. Collective Quantum Phenomena in Astrophysical Media
    Dr Fereshteh Rajabi (McMaster University)
    20/06/2026, 14:00
    Quantum Information
    Contributed Talk

    Astrophysical environments provide natural laboratories for collective quantum phenomena on scales far beyond those accessible in conventional laboratory experiments. In this talk, I will discuss how large radiatively coupled ensembles in astrophysical media can develop macroscopic coherence and exhibit cooperative radiative behavior, including superradiant and subradiant dynamics. Using...

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  5. 42. Exotic differential seven spheres and the two qubit phase space
    Prof. Manu Paranjape
    20/06/2026, 14:20
    Quantum Information
    Contributed Talk

    We study the two qubit phase space which is very simply a seven sphere. However, the topological seven spheres come in 28 inequivalent differential structures. We study the non-abelian Berry connection on the Kaluza-Klein reduced seven sphere to the four sphere with Yang-Mills fields, to see how the exotic differential structure can affect the two qubit system.

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  6. 52. Eigenstate thermalization hypothesis as a quantum resource for linear algebra problems
    Thomas Baker (Department of Physics & Astronomy and also of Chemistry, University of Victoria)
    20/06/2026, 14:40
    Quantum Information
    Contributed Talk

    The eigenstate thermalization hypothesis formally connects time evolution in a quantum system with the micro-canonical ensemble system average in statistical physics. The formal reliance on random matrix theory is discussed, justifying the main statement, and then extended to the case of quantum circuits where the micro-canonical ensemble emerges explicitly without invoking random matrices....

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  7. 83. Do $\psi$-Ontic Models Capture the Reality of Pure Quantum States? A Response from Measure Theory
    Doyeong Kim (University of Calgary)
    20/06/2026, 16:00
    Quantum Information
    Contributed Talk

    Abstract: Ontological models of quantum theory seek to realize quantum theory as a statistical theory over underlying degrees of freedom, whose measurement statistics are described by classical probability theory. Harrigan and Spekkens (2010) proposed a distinction between ontological models in which pure quantum states represent states of reality ($\psi$-ontic) or knowledge about reality...

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  8. 85. Finite-Size Effects in Quantum Metrology at Strong Coupling: Microscopic vs Phenomenological Approaches
    Ali Pedram (University of Calgary)
    20/06/2026, 16:20
    Quantum Information
    Contributed Talk

    Equilibrium quantum metrology is often formulated under assumptions of weak system-bath coupling and thermodynamic limit scaling, which may not be valid for realistic finite-size (FS) quantum devices. Here, we establish how strong coupling (SC) and FS effects jointly modify achievable precision bounds for equilibrium quantum probes. Considering a transverse-field anisotropic XY spin chain...

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  9. 76. A Unified Framework for Locally Stable Phases
    Raz Firanko (Perimeter Institute for Theoretical Physics, IQC)
    20/06/2026, 16:40
    Quantum Information
    Contributed Talk

    We propose a unifying framework for characterizing pure and mixed state phases of matter across equilibrium, non equilibrium, and metastable regimes. We introduce the concept of locally stable states, defined by the operational property that any local operation (including post selection) can be reversed by a local channel. We prove that local stability is equivalent to a state being short...

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