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The 7th series of seminars organized by QRST.

Quantum Research Seminars Toronto consist of two 30 min talks about some Quantum Computation topic. Seminars are given by high-level quantum computing researchers with the focus on disseminating their research among other researchers from this field. We encourage to attend researchers regardless of their experience as well as graduate and undergraduate students with particular interest in this field. Basic notions on quantum computing are assumed, but no expertise in any particular subject of this field.

In this 7th series of seminars, the speakers will be Christine Muschik (IQC) and Jesse Stryker (Maryland Center for Fundamental Physics). Their talks are titled "A measurement-based variational quantum eigensolver " and "SU(2) gauge theory on a digital quantum computer", respectively.

We will send a Zoom link to those who register for this event 2 days, 2 hours and 10 min before the event starts.

The event recording, slides and chat history will be published in our Youtube channel and sent to the registered participants.

Looking forward to seeing you all!


Talk 1:

A measurement-based variational quantum eigensolver

Variational quantum eigensolvers (VQEs) combine classical optimization with efficient cost function evaluations on quantum computers. We propose a new approach to VQEs using the principles of measurement-based quantum computation. This strategy uses entangled resource states and local measurements. We present two measurement-based VQE schemes. The first introduces a new approach for constructing variational families. The second provides a translation of circuit-based to measurement-based schemes. Both schemes offer problem-specific advantages in terms of the required resources and coherence times.


About the speaker:

Christine Muschik joined the Institute for Quantum Computing in 2017 as an Assistant Professor in the Department of Physics and Astronomy. In Munich, Muschik studied physics at the Ludwig-Maximillians-Universität. She completed her dissertation at the Max Planck Institute of Quantum Optics under the supervision of J. Ignacio Cirac. Her theoretical research in quantum optics earned her the Alexander von Humboldt postdoctoral fellowship at ICFO in Barcelona, as part of Maciej Lewenstein’s quantum optics theory group. Muschik continued her postdoctoral research at IQOQI in Innsbruck, Austria, with Peter Zoller. She joins the University of Waterloo from the Institute of Theoretical Physics, University of Innsbruck where she was a University Assistant.

Talk 2:

SU(2) gauge theory on a digital quantum computer

Results from the first digital quantum simulation of an SU(2) gauge theory are presented. This was done by analytically constructing gauge invariant states and implementing a Trotterized time evolution operator for that basis on superconducting hardware. By using error mitigation techniques, electric energy measurements could be reliably extracted following one Trotter-Suzuki time step. This work is a small but important step toward determining what field-theoretic calculations will be feasible on near-term devices.

Ref.: Phys. Rev. D 101, 074512 (2020) []

About the speaker:

Jesse Stryker is a postdoctoral associate with the Maryland Center for Fundamental Physics working at the interface of quantum field theory and quantum computation. He completed his Ph.D. in 2020 at the University of Washington in Seattle, where he was advised by David B. Kaplan. Jesse's studies have considered various aspects of near- and far-term quantum simulation of lattice gauge theories, most notably how to deal with local gauge constraints. Before going to Seattle, Jesse got his dual B.S. in physics and mathematics with a minor in Italian language from Arizona State University.

Event series  CQIQC Seminars