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  • Banner IYQ - CQIQC Website
    2025 is the International Year of Quantum Science and Technology
    This global initiative, proclaimed by the United Nations on June 7, 2024, marks a significant milestone in the world of science and technology. This webpage serves as your central resource for IYQ events, activities, and information. We aim to increase public awareness about the importance and applications of quantum science across various fields.

CQIQC

CQIQC is tasked with promoting research collaborations in the rapidly evolving interdisciplinary fields of quantum information and quantum control. CQIQC's activities at the University of Toronto encompass the Departments of Chemistry, Physics, Mathematics, Computer Science, Electrical Engineering, and Materials Science.

The Center was established in April 2004 with internal funding from the President of the University of Toronto, the Vice-President of Research and Associate Provost, the Dean of the Faculty of Arts & Science, and the Dean of the Faculty of Engineering. CQIQC funds endowed postdoctoral fellowships and summer student scholarships, organizes conferences, workshops and summer schools, coordinates the development and teaching of graduate courses in quantum science, and runs a seminar series. It also sponsors the biennial John Stewart Bell Prize for Research on Fundamental Issues in Quantum Mechanics and their Applications.

We encourage the UofT community to join us. To sign up to our mail list and participate in our activities, please contact quantum@utoronto.ca or visit us at LinkedIn.

Research Areas

CQIQC members are involved in a variety of theoretical and experimental activities, including coherent control, quantum optics, quantum cryptography, quantum decoherence-control, and quantum algorithms.

Click the title to learn more about our researchers' latest work and projects.

Recent Publications

Normalized temporal phase profiles used in the key rate analysis
Hidden Multidimensional Modulation Side Channels in Quantum Protocols
Quantum protocols such as quantum key distribution (QKD) and blind quantum computing allow for information-theoretic, quantum-safe security . Thanks to measurement-device-independent QKD (MDI QKD), all side channels on the detection end can be completely eliminated . Therefore, the source, as well as device-independent (DI) QKD are the last frontiers of investigation for security, with DI QKD remaining impractical due to its demanding requirements, such as near-perfect detector efficiencies.
Variable-strength measurement results
Variable-strength nonlocal measurements reveal quantum violations of classical counting principles
Quantum theory has proven wildly successful in predicting properties of systems whose past or future are specified. Applying the theory to systems with a definite past and future yields infamously counterintuitive predictions, e.g., three quantum pigeons can apparently occupy two pigeonholes without any pair occupying the same pigeonhole. Are such counterintuitive predictions merely an artifact of measurement disturbance?
Bosonic Quantum Device
Simulating Vibrational Dynamics on Bosonic Quantum Devices
Quantum algorithms for quantum chemistry on qubit-based quantum devices have seen tremendous development over the past decade. Although algorithms for electronic structure theory have been at the forefront of these advances, calculation of vibrational and vibronic spectra have also recently started gaining attention.5−15 However, the latter algorithms require a boson-to-qubit mapping that necessitates truncating the bosonic Fock space above a chosen threshold.
Intensity noise power spectral density (PSD) for various Sagnac loop lengths.
Long-fiber Sagnac interferometers for twin-field quantum key distribution networks
Based on carriers that cannot be copied or eavesdropped without notice to the communicating parties, quantum key distribution (QKD) allows remote users to establish shared encryption keys with information-theoretic security. QKD networks are an important building block for large-scale quantum networks and have been studied extensively [5– 12 ]. However, their key rates are limited by the repeaterless bounds on the key rate scaling with channel loss.