October 15, 2024 11:00 AM

October 16, 2024 4:30 PM
October 15, 2024 11:00 AM

October 16, 2024 4:30 PM
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Hôtel Château Bromont
Hôtel Château Bromont
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.
10h55 Mot d'ouverture (Salon A)
11h00 Présentation (Salon A)
12h00 Dîner (Salle Knowlton)
13h30 Présentation (Salon A)
14h15 Présentation (Salon A)
14h40 Présentation (Salon A)
15h00 Pause café (Salon C)
15h30 Présentation (Salon A)
16h00 Présentation (Salon A)
17h00 Session d'affiches avec rafraîchissements (Salon C)
19h30 Souper INTRIQ (Salle Knowlton)
9h00 Présentation (Salon A)
10h00 Présentation (Salon A)
10h30 Pause café (Salon C)
11h00 Présentation (Salon A)
12h00 Dîner (Salle Knowlton)
13h30 Présentation (Salon A)
14h30 Pause café (Salon C)
15h00 Présentation (Salon A)
15h45 Présentation (Salon A)
16h05 Présentation (Salon A)
16h25 Mot de fermeture (Salon A)
Étudiant à la maîitrise, Université de Montréal
Directeur: Philippe StJean
Understanding the statistical fluctuations of a photonic field
Measuring the statistical fluctuation of an observable is done through the calculation of statistical cumulants, such as the variance. Recently, several theoretical works have shown that these statistical cumulants depend on the geometry of the subregion of space in which they are measured. The aim of this research project is to build a quantum imaging setup for studying the evolution of intensity fluctuations in a photonic field. The first part of the project is to build a setup for imaging one and only one pulse of entangled photons. The second is to analyze the spatial fluctuations of these single pulses. This will enable us to study the transition from the classical, Gaussian regime to the quantum, poissonian or subpoissonian regime, and to investigate the emergence of universal laws describing the evolution of statistical cumulants. This project will provide the technical means to study the transition between the classical and quantum worlds, based on the statistical properties of measured fluctuations.
Postdoc, Université de Montréal
Directeur: Philippe StJean
Sujet à venir
Doctorant, Polytechnique Montréal
Directeur: Denis Seletskiy
FieldSensitive Detection of fsPulses in the MidInfrared Using SubCycle Electron Tunneling
A recent advancement in photonics is the use of electron tunneling to directly detect the electric field of an optical pulse. Since tunneling through a nanogap is a highly nonlinear process with respect to the electric field applied, the created electron bursts emitted are shorter than the period of oscillation of the optical field applied. Thus, these bursts of electron can probe the electric field of an incoming wave on a subcycle scale. Due to the nature of the tunneling process, the midinfrared spectral region has an advantage for efficient electron transport. In this work, we will present our advancement in the field resolved detection of midinfrared pulses, towards the detection of quantum states of light.
Doctorant, Université de Montréal
Directeur: Philippe StJean
Anomalous Quantum Hall Effect for Light in Photonic Crystals
The ability to emulate exotic states of matter with light has open the door to the realization of topological phases of matter that are very difficult to study in the solidstate. Here, we investigate photonic crystals with a deformed honeycomb lattice. This deformation induces artificial gauge fields at the Dirac points such that we can have effective electric and/or magnetic fields (depending on the deformation) acting on the light in the crystal. Using the simulation module MPB (Mit Photonic Bands), we observe Landau levels and the anomalous Hall effect for light, i.e. a nonreciprocal displacement of a light wavepacket. For the latter, we also show that the direction of the Hall deviation depends on the circular polarization of the light. In the near future, we envision harnessing this chiral routing of light for entangling remote solidstate impurities.
Doctorant, Université de Sherbrooke
Directeur: Mathieu Juan
Sujet à venir
10:55 Opening remarks (Salon A)
11:00 Talk (Salon A)
12:00 Lunch (Knowlton room)
13:30 Talk (Salon A)
14:15 Talk (Salon A)
14:40 Talk (Salon A)
15:00 Coffee break (Salon C)
15:30 Talk (Salon A)
16:00 Talk (Salon A)
17:00 Poster session with refreshments (Salon C)
19:30 INTRIQ dinner (Knowlton room)
9:00 Talk (Salon A)
10:00 Talk (Salon A)
10:30 Coffee break (Salon C)
11:00 Talk (Salon A)
12:00 Lunch (Knowlton room)
13:30 Talk (Salon A)
14:30 Coffee break (Salon C)
15:00 Talk (Salon A)
15:45 Talk (Salon A)
16:05 Talk (Salon A)
16:25 Closing remarks (Salon A)
Master student, Université de Montréal
Director: Philippe StJean
Understanding the statistical fluctuations of a photonic field
Measuring the statistical fluctuation of an observable is done through the calculation of statistical cumulants, such as the variance. Recently, several theoretical works have shown that these statistical cumulants depend on the geometry of the subregion of space in which they are measured. The aim of this research project is to build a quantum imaging setup for studying the evolution of intensity fluctuations in a photonic field. The first part of the project is to build a setup for imaging one and only one pulse of entangled photons. The second is to analyze the spatial fluctuations of these single pulses. This will enable us to study the transition from the classical, Gaussian regime to the quantum, poissonian or subpoissonian regime, and to investigate the emergence of universal laws describing the evolution of statistical cumulants. This project will provide the technical means to study the transition between the classical and quantum worlds, based on the statistical properties of measured fluctuations.
Postdoc, Université de Montréal
Director: Philippe StJean
Subject to be announced
PhD student, Polytechnique Montréal
Director: Denis Seletskiy
FieldSensitive Detection of fsPulses in the MidInfrared Using SubCycle Electron Tunneling
A recent advancement in photonics is the use of electron tunneling to directly detect the electric field of an optical pulse. Since tunneling through a nanogap is a highly nonlinear process with respect to the electric field applied, the created electron bursts emitted are shorter than the period of oscillation of the optical field applied. Thus, these bursts of electron can probe the electric field of an incoming wave on a subcycle scale. Due to the nature of the tunneling process, the midinfrared spectral region has an advantage for efficient electron transport. In this work, we will present our advancement in the field resolved detection of midinfrared pulses, towards the detection of quantum states of light.
PhD student, Université de Montréal
Director: Philippe StJean
Anomalous Quantum Hall Effect for Light in Photonic Crystals
The ability to emulate exotic states of matter with light has open the door to the realization of topological phases of matter that are very difficult to study in the solidstate. Here, we investigate photonic crystals with a deformed honeycomb lattice. This deformation induces artificial gauge fields at the Dirac points such that we can have effective electric and/or magnetic fields (depending on the deformation) acting on the light in the crystal. Using the simulation module MPB (Mit Photonic Bands), we observe Landau levels and the anomalous Hall effect for light, i.e. a nonreciprocal displacement of a light wavepacket. For the latter, we also show that the direction of the Hall deviation depends on the circular polarization of the light. In the near future, we envision harnessing this chiral routing of light for entangling remote solidstate impurities.
PhD student, Université de Sherbrooke
Director: Mathieu Juan
Subject to be announced