Quantum mechanics redefines information and its fundamental properties. Researchers at Perimeter Institute work to understand the properties of quantum information and study which information processing tasks are feasible, and which are infeasible or impossible. This includes research in quantum cryptography, which studies the tradeoff between information extraction and disturbance, and its applications. It also includes research in quantum error correction, which involves the study of methods for protecting information against decoherence. Another important side of the field is studying the application of quantum information techniques and insights to other areas of physics, including quantum foundations and condensed matter.
Format results

21 talksCollection NumberC24002
Talk

Opening Remarks

Max Planck Institute of Quantum Optics

Perimeter Institute for Theoretical Physics




Towards largescale quantum simulations with trapped ions  Rajibul Islam
Institute for Quantum Computing (IQC) 





Causalworlds
63 talksCollection NumberC24018Talk


Tutorial: Causal Inference Meets Quantum Physics
Perimeter Institute for Theoretical Physics 
Counterfactual and Graphical Frameworks for Causal Modeling
University of Washington 

Modeling Latent Selection with Structural Causal Models
University of Amsterdam, Kortewegde Vries Institute for Mathematics 
Relating Wigner's Friend Scenarios to Nonclassical Causal Compatibility, Monogamy Relations, and Fine Tuning
Perimeter Institute for Theoretical Physics 
Zero Inflation as a Missing Data Problem: a Proxybased Approach
Johns Hopkins Whiting School of Engineering 


Physics of Quantum Information
20 talksCollection NumberC24017Talk


Repetition Code Revisited
University of California, Santa Barbara 

Stability of mixedstate quantum phases via finite Markov length
Stanford University 
The rise and fall of mixedstate entanglement: measurement, feedback, and decoherence
University of Maryland, College Park 
Universal bound on topological gap
Massachusetts Institute of Technology (MIT)  Department of Physics 
Mapping ground states to stringnets
Massachusetts Institute of Technology (MIT) 
Sequential Quantum Circuit
California Institute of Technology


Foundations of Quantum Computational Advantage
21 talksCollection NumberC24020Talk


Values for compiled XOR nonlocal games
University of Ottawa 
Reliable quantum computational advantages from quantum simulation
University of Granada 
Cohomological description of contextual measurementbased quantum computations — the temporally ordered case
Leibniz University Hannover 





Quantum Information 2023/24
13 talksCollection NumberC24012Talk

Quantum Information Lecture
Institute for Quantum Computing (IQC) 
Quantum Information Lecture
Institute for Quantum Computing (IQC) 
Quantum Information Lecture
Institute for Quantum Computing (IQC) 
Quantum Information Lecture
Institute for Quantum Computing (IQC) 
Quantum Information Lecture
Institute for Quantum Computing (IQC) 
Quantum Information Lecture
Institute for Quantum Computing (IQC) 
Quantum Information Lecture
Institute for Quantum Computing (IQC) 
Quantum Information Lecture
Institute for Quantum Computing (IQC)


QPV 2023: Advances in quantum position verification
12 talksCollection NumberC23037Talk


QPV: An Overview and Reflections
Centrum Wiskunde & Informatica 
PopescuRohrlich correlations imply efficient instantaneous nonlocal quantum computation
University of OttawaPIRSA:23090023 
Nonlocal quantum computation meets quantum gravity
Perimeter Institute for Theoretical Physics 
Quantum ErrorCorrection and Holographic Task
Perimeter Institute for Theoretical Physics 

Protocols and Implementations of Quantum Position Verification

University of Illinois UrbanaChampaign

University of Illinois


Long distance quantum communications: Quantum Experiments using Satellite Technologies (QUEST)
Raman Research Institute


New Frontiers in Machine Learning and Quantum
10 talksCollection NumberC22034Talk

Quantum adiabatic speedup on a class of combinatorial optimization problems

Harvard University
 Madelyn Cain


Towards an artificial Muse for new ideas in Quantum Physics
Max Planck Institute for the Science of Light 
Matchgate Shadows for Fermionic Quantum Simulation

Alphabet (United States)
 Kianna Wan


SelfCorrecting Quantum ManyBody Control using Reinforcement Learning with Tensor Networks
L'Ecole Polytechnique Federale de Lausanne (EPFL) 
A Study of Neural Network Field Theories
Perimeter Institute for Theoretical Physics 

Representing quantum states with spiking neural networks

University of Ottawa
 Stefanie Czischek


Adaptive Quantum State Tomography with Active Learning
LudwigMaximiliansUniversität München (LMU)


Cold Atom Molecule Interactions (CATMIN)
22 talksCollection NumberC22028Talk

Introduction & Welcoming Remarks
Quantum Valley Ideas Laboratories 
Perimeter Greeting
Perimeter Institute for Theoretical Physics 

Indirect spinspin interactions with Rydberg molecules
Harvard University 

Resonant dipoledipole interactions between Rydberg atoms and polar molecules at temperatures below 1 K
University College London 
Polyatomic ultralong range Rydberg molecules
University of Granada 
Observation of linewidth narrowing in EIT polarization spectroscopy involving hot Rydberg atoms with Laguerre Gaussian modes
Universidade Estadual Paulista (UNESP)


Quantum Information 2021/2022
10 talksCollection NumberC22016Talk

Quantum Information 2021/2022

Institute for Quantum Computing (IQC)

Royal Military College SaintJean
PIRSA:22020073 

Quantum Information 2021/2022

Institute for Quantum Computing (IQC)

Royal Military College SaintJean
PIRSA:22030073 

Quantum Information 2021/2022

Institute for Quantum Computing (IQC)

Royal Military College SaintJean
PIRSA:22030074 

Quantum Information 2021/2022

Institute for Quantum Computing (IQC)

Royal Military College SaintJean
PIRSA:22030075 

Quantum Information 2021/2022

Institute for Quantum Computing (IQC)

Royal Military College SaintJean
PIRSA:22030076 

Quantum Information 2021/2022

Institute for Quantum Computing (IQC)

Royal Military College SaintJean
PIRSA:22030077 

Quantum Information 2021/2022

Institute for Quantum Computing (IQC)

Royal Military College SaintJean
PIRSA:22030078 

Quantum Information 2021/2022

Institute for Quantum Computing (IQC)

Royal Military College SaintJean
PIRSA:22030079 


Quantum Gravity 2020
22 talksCollection NumberC20031Talk

Welcome and Opening Remarks
Perimeter Institute for Theoretical Physics 
Approaches to Quantum Gravity: Key Achievements and Open Issues
MaxPlanckInstitut für Gravitationsphysik 
Quantum gravity from the loop perspective
AixMarseille University 
Lessons for quantum gravity from quantum information theory
Massachusetts Institute of Technology (MIT) 
Understanding of QG from string theory
Princeton University 
Progress in horizon thermodynamics
University of Cambridge 
Asymptotically Safe Amplitudes from the Quantum Effective Action
Radboud Universiteit Nijmegen 
The Remarkable Roundness of the Quantum Universe
Radboud Universiteit Nijmegen


PSI 2019/2020  Relativistic Quantum Information Part 1
4 talksCollection NumberC20013Talk

PSI 2019/2020  Relativistic Quantum Information Part 1  Lecture 1
Institute for Quantum Computing (IQC) 
PSI 2019/2020  Relativistic Quantum Information Part 1  Lecture 2
Institute for Quantum Computing (IQC) 
PSI 2019/2020  Relativistic Quantum Information Part 1  Lecture 3
Institute for Quantum Computing (IQC) 
PSI 2019/2020  Relativistic Quantum Information Part 1  Lecture 4
Institute for Quantum Computing (IQC)


Indefinite Causal Structure
26 talksCollection NumberC19049Talk


10 years of the quantum SWITCH: state of the art and new perspectives
University of Hong Kong (HKU) 
Cyclic quantum causal models and violations of causal inequalities
Université Libre de Bruxelles 
TBA
University of Waterloo 
Composing causal orderings
University of Oxford 
Quantum principle of relativity
University of Warsaw 

What happens when we quantize time?
Saint Anselm College


WaterlooMunich Joint Workshop
21 talksCollection NumberC24002Join us for a pioneering joint workshop between renowned research institutions in Munich and Waterloo! This exciting event will focus on the topic of quantum simulation, with additional talks delving into various subjects of quantum science and technology. Designed to include researchers across different levels, from group leaders, postdoctoral fellows, and PhD students, this inaugural collaboration aims to unite scientists from both locations, fostering valuable networking opportunities and promoting interdisciplinary collaboration. Don't miss this extraordinary opportunity to connect, exchange ideas, and shape the future of quantum research together!

Causalworlds
63 talksCollection NumberC24018Understanding causality is fundamental to science and inspires wideranging applications, yet there are several distinct notions of causation. Recently, there have been important developments on the role of causality in quantum physics, relativistic physics and their interplay. These have unearthed a plethora of fascinating open questions regarding the nature of causation, emergence of spacetime structure and the limits of quantum information processing. At the same time, causal reasoning has become an important tool in machine learning and statistics, with applications ranging from big data to healthcare. This conference brings together experts from different areas of physics working on questions related to causality, as well as selected researchers who bridge the gap between fundamental research and current industrial applications. The aim of the conference is to provide a venue for crosspollination of these ideas through scientific exchange between these communities. The conference will focus on the following facets of causality:
• Quantum and classical causal inference
• Indefinite causal order and quantum reference frames
• Causality in quantum field theory and quantum gravity
• Experiments and applications of causality
:: :: ::
Important dates
Paper submission deadline: 24 May 2024 // 31 May 2024
Paper notification: 3 July 2024 Registration deadline (with application for financial assistance): 18 July 2024
Registration deadline: 28 August 2024
Conference: 1620 September 2024 Update: The submission deadline has been extended to 31st May 2024 for
papers which clearly justify their relevance for the following three
topics: 1) classical causal inference, 2) causality in relativistic physics (including quantum field theory and quantum gravity) and 3) experiments in causality. As we have received a sufficiently high number of submissions on the remaining topics (particularly indefinite causality and quantum causal models), the original deadline of 24th May still holds for submissions in this category. :: :: ::
Call for Abstracts
Prospective speakers can submit a paper for a contributed talk (in person or online) and/or a poster (in person only) via the Call for Abstracts. The Call for Abstracts is now open! Submissions for a talk will automatically be considered for a poster if not accepted for a talk.:: :: ::
Invited Speakers
Jessica Bavaresco (University of Geneva)
Cyril Branciard (CNRS, University Grenoble Alpes)
Rafael Chaves (Federal University of Rio Grande do Norte)
Giulio Chiribella (The University of Hong Kong)
Doreen Fraser (University of Waterloo)
AnneCatherine de la Hamette (IQOQI Vienna)
Ciarán Lee (Spotify)
Tein van der Lugt (University of Oxford)
Joris M. Mooij (University of Amsterdam)
Mio Murao (University of Tokyo)
Alejandro PozasKerstjens (University of Geneva)
Huw Price (Trinity College, Cambridge)
Renato Renner (ETH Zürich)
Thomas Richardson (University of Washington)
Sally Shrapnel (The University of Queensland)
Sumati Surya (Raman Research Institute)
Rainer Verch (University of Leipzig)
:: :: ::
Programme Committee
V Vilasini (ETH Zürich & Inria, University Grenoble Alpes) (PC Chair)
Augustin Vanrietvelde (Télécom Paris) (PC Cochair)
Alastair Abbott (Inria, University Grenoble Alpes)
Časlav Brukner (IQOQI Vienna & University of Vienna)
Eric Cavalcanti (Griffith University)
Chris Fewster (University of York)
Lucien Hardy (Perimeter Institute)
Hlér Kristjánsson (Perimeter Institute & IQC & Université de Montréal)
Giulia Rubino (University of Bristol)
Nitica Sakharwade (Università degli Studi di Napoli Federico II)
Robert Spekkens (Perimeter Institute)
Jacopo Surace (Perimeter Institute)
Elie Wolfe (Perimeter Institute)
LinQing Chen (ETH Zürich & IQOQI Vienna)
Hippolyte Dourdent (ICFO Barcelona)
Tamal Guha (University of Hong Kong)
Robin Lorenz (Quantinuum, Oxford)
Maria Papageorgiou (IQOQI Vienna)
Nicola Pinzani (Université libre de Bruxelles)
MarcoTúlio Quintino (Sorbonne Université, Paris)
MarcOlivier Renou (Inria ParisSaclay & CPHT, École polytechnique)
David Schmid (ICTQT, University of Gdańsk)
John Selby (ICTQT, University of Gdańsk)
Akihito Soeda (National Institute of Informatics, Tokyo)
Matthew Wilson (University College London)
:: :: ::
Scientific Organizers
Hlér Kristjánsson (Perimeter Institute & IQC & Université de Montréal) (Chair)
V Vilasini (ETH Zürich & Inria, University Grenoble Alpes)
Robert Spekkens (Perimeter Institute)
Lucien Hardy (Perimeter Institute)
Elie Wolfe (Perimeter Institute)
Jacopo Surace (Perimeter Institute)
Marina Maciel Ansanelli (Perimeter Institute)
Yìlè Yīng (Perimeter Institute)
María Ciudad Alañón (Perimeter Institute)
Daniel Centeno Díaz (Perimeter Institute)
Khushi Gandhi (Perimeter Institute & University of Waterloo):: :: ::
Previous editions:
Causalworlds 2022: The interface between quantum and relativistic causality, foundations and practicalities
Organised at ETH Zürich in 2022. Website: https://causalworlds.ethz.ch/" 
Physics of Quantum Information
20 talksCollection NumberC24017The dialogue between quantum information and quantum matter has fostered notable progress in both fields. Quantum information science has revolutionized our understanding of the structure of quantum manybody systems and novel forms of outofequilibrium quantum dynamics. The advances of quantum matter have provided novel paradigms and platforms for quantum information processing.
This conference aims to bring together leading experts at the intersections of quantum information and quantum matter. Key topics include: (i) quantum error correction, (ii) quantum dynamics, and (iii) quantum simulation.Organizers:
Timothy Hsieh, Perimeter Institute
Beni Yoshida, Perimeter Institute
Zhi Li, Perimeter Institute
TsungCheng Lu, Perimeter Institute
Meenu Kumari, National Research Council Canada:: :: ::

Foundations of Quantum Computational Advantage
21 talksCollection NumberC24020The workshop marks the halfway point of the similarly named (FoQaCiA, pronounced "focaccia") collaboration between researchers in Canada and Europe, funded as part of a flagship partnership between NSERC and Horizon Europe.
https://www.foqacia.org/
The goal of FoQaCiA is to develop new foundational approaches to shed light on the relative computational power of quantum devices and classical computers, helping to find the "line in the sand" separating tasks admitting a quantum speedup from those that are classically simulable.
The workshop will focus on the four central interrelated themes of the project:
1. Quantum contextuality, nonclassicality, and quantum advantage
2. The complexity of classical simulation of quantum computation
3. The arithmetic of quantum circuits
4. The efficiency of faulttolerant quantum computation
Our view is that the future success of quantum computing critically depends on advances at the most fundamental level, and that largescale investments in quantum implementations will only pay off if they can draw on additional foundational insights and ideas:: :: ::
Scientific Organizers:
Rui Soares Barbosa (INL  International Iberian Nanotechnology Laboratory)
Anne Broadbent (University of Ottawa)
Ernesto Galvão (INL  International Iberian Nanotechnology Laboratory)
Rob Spekkens (Perimeter Institute)
Jon Yard (Perimeter Institute):: :: ::
FoQaCiA is funded by:


QPV 2023: Advances in quantum position verification
12 talksCollection NumberC23037Quantum position verification (QPV) schemes use the properties of quantum information and the relativistic signalling bound to verify the location of an object (sometimes called a “tag”) to distant observers in an environment that may contain wouldbe spoofers. The guarantee is based on the assumptions of the underlying security model; various theoretically and practically interesting security models have been proposed. The area is attracting increasing interest, with new theoretical developments in security analyses, emerging experimental studies of QPV systems, and recently discovered surprising and intriguing connections to topics in quantum gravity. A workshop on QPV will be held at the Perimeter Institute for Theoretical Physics.
The workshop will cover topics related to all aspects of QPV, including, but not limited to:
 Theoretical developments related to the security of QPV schemes, including development or refinement of security models, proofs of security within given models, tradeoffs between security and efficiency, and Experimental studies of QPV and theoretical work aimed at developing practical QPV schemes.
 QPV’s relationship to other cryptographic tasks and primitives.
 QPV’s relationship to holography and quantum gravity.
Territorial Land Acknowledgement
Perimeter Institute acknowledges that it is situated on the traditional territory of the Anishinaabe, Haudenosaunee, and Neutral peoples.
Perimeter Institute is located on the Haldimand Tract. After the American Revolution, the tract was granted by the British to the Six Nations of the Grand River and the Mississaugas of the Credit First Nation as compensation for their role in the war and for the loss of their traditional lands in upstate New York. Of the 950,000 acres granted to the Haudenosaunee, less than 5 percent remains Six Nations land. Only 6,100 acres remain Mississaugas of the Credit land.
We thank the Anishinaabe, Haudenosaunee, and Neutral peoples for hosting us on their land.

New Frontiers in Machine Learning and Quantum
10 talksCollection NumberC22034This workshop will bring together a group of young trendsetters working at the frontier of machine learning and quantum information. The workshop will feature two days of talks, and ample time for participants to interact and form new collaborations in the inspiring environment of the Perimeter Institute. Topics will include machine learning, quantum field theory, quantum information, and unifying theoretical concepts.
Territorial Land AcknowledgementPerimeter Institute acknowledges that it is situated on the traditional territory of the Anishinaabe, Haudenosaunee, and Neutral peoples.
Perimeter Institute is located on the Haldimand Tract. After the American Revolution, the tract was granted by the British to the Six Nations of the Grand River and the Mississaugas of the Credit First Nation as compensation for their role in the war and for the loss of their traditional lands in upstate New York. Of the 950,000 acres granted to the Haudenosaunee, less than 5 percent remains Six Nations land. Only 6,100 acres remain Mississaugas of the Credit land.
We thank the Anishinaabe, Haudenosaunee, and Neutral peoples for hosting us on their land.

Cold Atom Molecule Interactions (CATMIN)
22 talksCollection NumberC22028In the first edition of the meeting, CATMIN (Cold ATom Molecule INteractions) was a new satellite meeting of ICPEAC devoted to the study of atomic and molecular systems, where longrange interactions and the extreme properties of highly excited electrons produce new physics and lead to new technologies. CATMIN's objective is to strengthen the links between cold atom physics, molecular physics, chemistry and condensed matter physics, so that new concepts and breakthroughs can emerge. Ions, atoms and molecules are naturally made quantum systems that can be controlled with light and low frequency electromagnetic fields, thus lending themselves to precision investigations and use in quantum technologies. The second CATMIN conference will be held a few days before the ICAP, which is a major conference in AMO physics, with the idea that scientists can attend both meetings. The CATMIN meeting will be a twoday conference held at the Perimeter Institute in Waterloo, ON, centered on Rydbergatom physics, cold ion physics and the interplay between these experimental platforms. Rydberg atom physics is experiencing a renaissance due to the application of the exaggerated properties of highly excited atoms for quantum information and quantum simulation. Rydberg states can even be observed in solids which is a subject of increasing interest. Cold ions, similarly, are exciting for quantum simulation and computing, becoming one of the central platforms in the race to build a quantum computer. Many exciting developments are also in progress in the area of coldmolecules. Longrange interactions open up fields of research such as the photoassociation of cold atoms to form ultracold molecules, and the excitation of Rydberg molecules demonstrating novel kinds of molecular bonding. Strong longrange interactions in all the systems permit the investigation of the fewbody and manybody regimes, including the few to manybody transition. The conference aims to share the latest developments and results in these exciting fields among the various ICAP communities as well as the broader physics and chemistry communities. Overall, the conference can forward quantum science and the application of quantum science, which furthers these fields of research by concentrating interest to attract people and resources to the field.
Sponsorship for this event has been provided by:
Perimeter Institute will make every effort to host the conference as an inperson event. However, we reserve the right to change to an online program to align with changes in regulations due to the COVID19 pandemic.
Territorial Land Acknowledgement
Perimeter Institute acknowledges that it is situated on the traditional territory of the Anishinaabe, Haudenosaunee, and Neutral peoples.
Perimeter Institute is located on the Haldimand Tract. After the American Revolution, the tract was granted by the British to the Six Nations of the Grand River and the Mississaugas of the Credit First Nation as compensation for their role in the war and for the loss of their traditional lands in upstate New York. Of the 950,000 acres granted to the Haudenosaunee, less than 5 percent remains Six Nations land. Only 6,100 acres remain Mississaugas of the Credit land.
We thank the Anishinaabe, Haudenosaunee, and Neutral peoples for hosting us on their land.

Quantum Information 2021/2022
10 talksCollection NumberC22016We will review the notion of entanglement in quantum mechanics form the point of view of information theory, and how to quantify it and distinguish it from classical correlations. We will derive Bell inequalities and discuss their importance, and how quantum information protocols can use entanglement as a resource. Then we will analyze measurement theory in quantum mechanics, the notion of generalized measurements and quantum channels and their importance in the processing and transmission of information. We will introduce the notions of quantum circuits and see some of the most famous algorithms in quantum information processing, as well as in quantum cryptography. We will also talk about the notion of distances and fidelity between states from the point of view of information theory and we will end with a little introduction to the notions of relativistic quantum information. 
Quantum Gravity 2020
22 talksCollection NumberC20031 
PSI 2019/2020  Relativistic Quantum Information Part 1
4 talksCollection NumberC20013PSI 2019/2020  Relativistic Quantum Information Part 1 
Indefinite Causal Structure
26 talksCollection NumberC19049There has been a surge of interest in indefinite causal structure the idea that cause and effect can no longer be sharply distinguished. Motivated both by experimentation with quantum switches and quantum gravity there can be situations in which there is no matterofthefact as to what the causal structure of spacetime is. This meeting will bring together workers in Quantum Foundations and Quantum Gravity in both theoretical experimental physics to discuss the state of the art of current research and set new directions for this emerging subdiscipline.