April 6, 2022 10:00 PM

April 6, 2022 12:00 PM
April 6, 2022 10:00 PM

April 6, 2022 12:00 PM
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Opening Remarks
Pr Mathieu Juan, Institut quantique  Université de Sherbrooke
Clasical and quantum computations as tensor networks
Pr Stefanos Kourtis, Institut quantique  Université de Sherbrooke
Classical and quantum computations as tensor networks
Break
Event organized in collaboration with the RQMP and animated by Mrs. Chloé Freslon, founder of URelles
Falisha Karpati, Ph.D.
Think Differently Together: Strengthening research and innovation by embracing cognitive diversity
LouisPhilippe Lamoureux (Slides / Présentation)
Thierry Debuischert, Thales  France (postponed to Monday at 13:15 / reporté à lundi 13h15)
Closing remarks of the day
Opening remark of the day
Thierry Debuischert, Thales  France
Professor Tami PeregBarnea, McGill University
Dynamic topology  quantized conductance and Majoranas on wires
Professor Philippe StJean, Université de Montréal
Topological physics with light and matter: new horizons
Break
Louis Gaudreau, National Research Council Canada (Ottawa)
Entanglement distribution via coherent photontospin conversion in semiconductor quantum dot circuits
Philippe Lamontagne, National Research Council Canada (Montréal)
BlackBox Impossibility in the Common Reference Quantum State Model
Olivier GagnonGordillo, Québec quantique lead
Presentation of the Québec Quantum ecosystem
Institut quantique  Université de Sherbrooke
Classical and quantum computations as tensor networks
Tensor networks are multilinearalgebra data structures that are finding application in diverse fields of science, from quantum manybody physics to artificial intelligence. I will introduce tensor networks and illustrate how they can be used to represent classical and quantum computations. I will then motivate tensor network algorithms that perform or simulate computations in practice and demonstrate their performance on benchmarks of current interest, such as model counting and quantum circuit simulation. I will close with an outline of ongoing work and an outlook on future directions.
Institut quantique  Université de Sherbrooke
Optomechanics with a nonlinear cavity
The possibility to operate massive mechanical oscillators close to or in the quantum regime has become central in fundamental sciences. LIGO is a prime example where quantum states of light are now used to further improve the sensitivity. Concretely, optomechanics relies on the use of photons to control the mechanical motion of a resonator, providing a path toward quantum states of massive objects and for the development of quantum sensors. In order to improve this control many approaches have been explored, some more complicated than others. In particular, in order to cool the mechanical motion a cavity can be used to realise sideband cooling. In general, linear cavities are favoured to allow for large photon number providing stronger cooling. I will show that, surprisingly, nonlinear cavities can be used to achieve very efficient cooling at low powers. Indeed, even in the bad cavity limit, we have been able to cool a mechanical resonator from 4000 thermal phonons down 11 phonons. Currently limited by flux noise, this approach opens promising opportunities to achieve quantum control of massive resonators, an avenue to study foundational questions.
McGill University
Dynamic topology  quantized conductance and Majoranas on wires
This talk will address the issue of outofequilibrium topological systems. While many materials and devices produced in labs today are topological at equilibrium, it is desirable to have a knob to tune or induce topological properties. For example, if we could dynamically turn a superconductor into a topological superconductor we may create the sought after Majorana fermions which are potential building blocks of quantum bits.
In this context we will explore the possibility of perturbing quantum systems using timeperiodic fields (i.e., radiation) and use the Floquet theory to characterize the driven states. We find that in topological systems, beyond the expected splitting of the spectrum into side bands, a change in the topology may occur. In the case of a topological superconductor, the driven system may develop new Majorana modes which do not exist at equilibrium and can be exchanged on a single wire. A protocol for exchanging Majoranas will be presented.
Université de Montréal
Topological physics with light and matter: new horizons
Topology is a branch of mathematics interested in geometric properties that are invariant under continuous deformation, e.g. the number of holes in an object. In the early 1980s it was demonstrated that similar topological properties can be defined for solids presenting appropriate symmetry elements. The discovery of these topological phases of matter has profoundly impacted our understanding of condensed matter, its influence ranging from better explaining the universality of the conductivity plateaus in the quantum Hall effect to developing new platforms for faulttolerant quantum computation[i]. In the late 2000s, Duncan Haldane (colaureate of the Nobel Prize in physics for the discovery of topological phases of matter) demonstrated that this topological physics is not restricted to condensed matter but can also emerge in artificial systems like photonic crystals through a careful engineering of their symmetry properties[ii]. Since then, these photonics platforms have proven to be an amazing resource for pushing the exploration of topological matter beyond what is physically reachable in the solidstate, leading to the emergence of a blooming field called topological photonics[iii].
In this presentation, I will describe recent experimental works based on excitonpolaritons, a hybrid lightmatter quasiparticle, which have opened new horizons in topological photonics[iv]. The main advantages of polaritonic systems arise from their dual nature: their photonic part allows for tailoring welldefined topological properties in lattices of coupled microcavities and makes them inherently nonhermitian; on the other hand, their matter part gives rise to a strong Kerrlike nonlinearity and to lasing[v]. I will then discuss in more details a recent work in which we took profit of these assets to experimentally extract topological invariants  a fundamental quantity in topology  in a polaritonic analog of graphene[vi]. Importantly, this has allowed us to directly probe the topological phase transition occurring in a critically strained lattice  i.e. where Dirac cones have merged  a condition impossible to reach in the solidstate. I will conclude this presentation by discussing how topological protection can provide a powerful asset for generating and stabilizing manybody quantum states of light and matter. Such mesoscopic quantum objects are highly desirable as they would provide an extended playground for quantum simulation, sensing applications or for generating exotic states of light such as manybody entangled states[vii].
[i] M. Z. Hasan and C. L. Kane. Rev. Mod. Phys. 82, 3045 (2010)
[ii] F. D. M. Haldane and S. Raghu. Phys. Rev. Lett. 100, 013904 (2008)
[iii] T. Ozawa et al. Rev. Mod. Phys. 91, 015006 (2019)
[iv] D. D. Solnyshkov, G. Malpuech, P. StJean et al. Opt. Mat. Express 11, 1119 (2021)
[v] I. Carusotto and C. Ciuti. Rev. Mod. Phys. 85, 299 (2013)
[vi] P. StJean et al. Phys. Rev. Lett. 126, 127403 (2021)
[vii] P. Lodahl et al. Nature 541, 473 (2017)
Think Differently Together: Strengthening research and innovation by embracing cognitive diversity
This talk will cover:
Biography
Falisha Karpati, PhD is a neuroscientist turned inclusion consultant. Falisha’s work focuses on using neuroscience to build inclusive environments in academic, research, and scientific organizations. Her approach to inclusion centres on the interconnectedness of cognitive, demographic, and experiential diversity. Prior to starting her consultancy practice, she worked as the Training and Equity Advisor for Healthy Brains, Healthy Lives at McGill University.
Head of Applied Quantum Physics
Thales Research & Technology
Researcher
National Research Council Canada (Ottawa)
In this talk, I will present our proposed long distance entanglement distribution scheme that aims to overcome fundamental limitations present in current optical schemes. By using direct band gap semiconductor quantum dots, efficiency and heralding advantages can be exploited through photontospin conversion. For this reason, materials such as GaAs are superior to Si in this type of applications. I will review current schemes to transfer polarization or timebin encoded photonic qubits to electron spin qubits and will describe adaptations to employ heavy holes which have a number of attractive properties including gfactor tunability. Finally, I will show preliminary results on quantum dot devices using Van der Waals heterostructures which present several potential advantages such as higher confinement energies due to their atomically thin geometry, easier combination with different substrates and the possibility of encoding information in their valley degree of freedom.
Biography
Louis Gaudreau studied physics at Sherbrooke University, followed by a masters and PhD in cosupervision with Andrew Sachrajda at NRC and Alexandre Blais at Sherbrooke. During his graduate studies, Louis studied electrostatic quantum dots and realized for the first time a coupled triple quantum dot system leading to the investigation of the first exchangeonly qubit. During this period he was invited to perform quantum dot experiments in Stefans Ludwig’s group at LMU in Munich. After his PhD, Louis changed fields and studied lightmatter interactions by combining quantum emitters and graphene to create different hybrid systems. These experiments were done during his postdoc at ICFO in Barcelona in the nanooptoelectronics group with Frank Koppens where he was awarded the prestigious MarieCurie fellowship. Finally, since 2015, Louis has worked as research officer at the NRC where he investigates different technologies linked to quantum information.
Researcher
National Research Council Canada (Montréal)
BlackBox Impossibility in the Common Reference Quantum State Model
We explore the cryptographic power endowed by arbitrary shared physical resources. We introduce the Common Reference Quantum State (CRQS) model, where the parties involved share a fresh entangled state at the outset of each protocol execution. This model is a natural generalization of the wellknown Common Reference String (CRS) model but appears to be more powerful. In the twoparty setting, a CRQS can sometimes exhibit properties associated with a Random Oracle queried once. We formalize this notion as a Weak OneTime Random Oracle (W1TRO), where we only ask of the output to have some randomness when conditioned on the input is still beyond the reach of the CRQS model. We prove that the security of W1TRO cannot be blackbox reduced to any assumption that can be framed as a cryptographic game. Our impossibility result employs the simulation paradigm formalized by Wichs (ITCS ’13) and has implications for other cryptographic tasks.
 There is no universal implementation of the FiatShamir transform whose security can be blackbox reduced to a cryptographic game assumption. This extends the impossibility result of Bitansky et al. (TCC ’13) to the CRQS model.
 We impose severe limitations on constructions of quantum lightning (Zhandry, Eurocrypt ’19). If a scheme allows n lightning states’ serial numbers (of length m such that n > m) to be combined in such a way that the outcome has entropy, then it implies W1TRO, and thus cannot be blackbox reduced to a cryptographic game assumption.
Senior Product Manager
Aspen Technology
Biography
Montrealbased quantum physicist, senior product manager, and full stack developer with strong experience building awardwinning hardware and software products. Currently Senior Product Manager at Aspen Technology leading connectivity and AI inference at the Edge. Prior to Aspen Technology, I worked at MachineToMachine Intelligence (M2Mi) a leader in IoT Security and Management located at NASA Ames research center in the heart of Silicon Valley.
Prior to M2Mi, built SQR Technologies a belgian quantum based, hardware security startup that pioneered distributed quantum key generation. Acquired by IDQ (Switzerland). Awarded a Ph.D. in Physics (Quantum Cryptography) from the University of Brussels. Research interests include: quantum cloning, experimental quantum cryptography, quantum noise reduction, and quantum random number generation.
En collaboration avec ISEQ, COPL, Québec Quantique, Optonique et NUMANA, l'INTRIQ vous invite le mercredi 6 avril dès 10h00 au 10e webinaire de la série Perspective Quantum avec M. Santosh Radha et M.Ian Buckley de la compagnie torontoise Agnostiq. Ils présenteront alors Getting Started with Hybrid Classical and Quantum Workflows withCovalent.
Programmation :
10 h 00 – Réseautage
10 h 30 – Mot d’ouverture par Nicolas Godbout, Professeur à Polytechnique Montréal et directeur de l’INTRIQ
10 h 35 – Getting Started withHybrid Classical and Quantum Workflows with Covalent (webinaire en anglais)
11 h 25 – Mot de clôture
11 h 30 – Réseautage
12 h 00 – Fin
Abstract:
Workflow orchestration tools are widely used to optimize and organize computations in the data science and machine learning industries. Covalent[1] is a new opensource Python tool which extends these principles to the academic community, with the goal of making computational experiments scalable, manageable, and reproducible. In this talk, we’ll discuss general principles of workflows and then focus on how Covalent is applied to scientific calculations in a quantum machine learning tutorial.
1. https://github.com/AgnostiqHQ/covalent
Based in Toronto, Agnostiq develops software tools and applications that aim to make quantum and high performance computing resources more accessible to enterprises and developers. Along with algorithmic research, Agnostiq is developing Covalent, an open source workflow orchestration platform designed to help users manage and execute tasks on heterogeneous compute resources.
Speakers:
Santosh Radha, PhD, Head of quantum algorythms, Agnotiq
Santosh holds a PhD in theoretical physics from Case Western Reserve University, where he initially started working on massive gravity and then moved to condensed matter physics. His research was to theoretically and computationally understand the topological effects occurring in quantum systems as a result of "knotted" wave functions in both interacting and noninteracting fermionic systems and its impact in lower dimensional entanglement. Apart from these, he is interested in a lot of domains, particularly in the intersection of mathematics, Physics, Computer Science and music.
Ian Buckley, Community and Partnerships Lead, Agnotiq
Ian received his PhD in Theoretical Physics from the Blackett Laboratory, Imperial College London. From physics, Ian moved into finance. He conducted research in & taught financial mathematics at Imperial College London, King's College London (where he received tenure), University of Toronto & McMaster University. In industry, Ian modelled financial risk at BARRA (now MSCI) & S&P Capital IQ.Prior to joining Agnostiq, Ian was the Modelling Lead with the Canadian Securities Transition Office (CSTO), advising the federal government, & building economic, econometric, network & agentbased models for systemic risk.
In collaboration with ISEQ, COPL, Québec Quantique, Optonique and NUMANA, INTRIQ invites you to attend on April 6th to the 10th webinar of the Perspective Quantum series with Mr Santosh Radha and MrIan Buckley of the Toronto based Agnostiq. They will present Getting Started with Hybrid Classical and Quantum Workflows withCovalent.
Schedule :
10:00 AM  Networking
10:30 AM  Opening remarks by Nicolas Godbout, Professor at Polytechnique Montreal and Director of INTRIQ
10:35 AM  Getting Started withHybrid Classical and Quantum Workflows with Covalent
11:25 AM  Closing remarks
11:30 12:00 Networking
Abstract:
Workflow orchestration tools are widely used to optimize and organize computations in the data science and machine learning industries. Covalent[1] is a new opensource Python tool which extends these principles to the academic community, with the goal of making computational experiments scalable, manageable, and reproducible. In this talk, we’ll discuss general principles of workflows and then focus on how Covalent is applied to scientific calculations in a quantum machine learning tutorial.
1. https://github.com/AgnostiqHQ/covalent
Based in Toronto, Agnostiq develops software tools and applications that aim to make quantum and high performance computing resources more accessible to enterprises and developers. Along with algorithmic research, Agnostiq is developing Covalent, an open source workflow orchestration platform designed to help users manage and execute tasks on heterogeneous compute resources.
Speakers:
Santosh holds a PhD in theoretical physics from Case Western Reserve University, where he initially started working on massive gravity and then moved to condensed matter physics. His research was to theoretically and computationally understand the topological effects occurring in quantum systems as a result of "knotted" wave functions in both interacting and noninteracting fermionic systems and its impact in lower dimensional entanglement. Apart from these, he is interested in a lot of domains, particularly in the intersection of mathematics, Physics, Computer Science and music.
Ian received his PhD in Theoretical Physics from the Blackett Laboratory, Imperial College London. From physics, Ian moved into finance. He conducted research in & taught financial mathematics at Imperial College London, King's College London (where he received tenure), University of Toronto & McMaster University. In industry, Ian modelled financial risk at BARRA (now MSCI) & S&P Capital IQ.Prior to joining Agnostiq, Ian was the Modelling Lead with the Canadian Securities Transition Office (CSTO), advising the federal government, & building economic, econometric, network & agentbased models for systemic risk.