# Video Library

Since 2002 Perimeter Institute has been recording seminars, conference talks, and public outreach events using video cameras installed in our lecture theatres.  Perimeter now has 7 formal presentation spaces for its many scientific conferences, seminars, workshops and educational outreach activities, all with advanced audio-visual technical capabilities.  Recordings of events in these areas are all available On-Demand from this Video Library and on Perimeter Institute Recorded Seminar Archive (PIRSA)PIRSA is a permanent, free, searchable, and citable archive of recorded seminars from relevant bodies in physics. This resource has been partially modelled after Cornell University's arXiv.org.

## PSI 2017/2018 - String Theory - Lecture 9

Friday Mar 02, 2018
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## PSI 2017/2018 - Beyond Standard Model - Lecture 4

Friday Mar 02, 2018
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## IQC - Quantum Error Correction - Lecture 8

Thursday Mar 01, 2018
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## PSI 2017/2018 - Quantum Information - Lecture 8

Thursday Mar 01, 2018
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## PSI 2017/2018 - String Theory - Lecture 8

Thursday Mar 01, 2018
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## Characterizing useful quantum computers

Wednesday Feb 28, 2018
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Quantum computers can only offer a computational advantage when they have sufficiently many qubits operating with sufficiently small error rates. In this talk, I will show how both these requirements can be practically characterized by variants of randomized benchmarking protocols. I will first show that a simple modification to protocols based on randomized benchmarking allows multiplicative-precision estimates of error rates.  I will then outline a new protocol for estimating the fidelity of arbitrarily large quantum systems using only single-qubit randomizing gates.

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## PSI 2017/2018 - Quantum Information - Lecture 7

Wednesday Feb 28, 2018
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## The spread and scrambling of quantum information for local random circuits, with and without conserved quantities

Wednesday Feb 28, 2018

We  examine 1D spin-chains evolving under random local unitary circuits and prove a number of exact results on the behavior of out-of-time-ordered commutators (OTOCs), and entanglement growth. These results follow from the observation that the spreading of operators in random circuits is described by a hydrodynamical'' equation of motion. In this hydrodynamic picture quantum information travels in a front with a `butterfly velocity' $v_{\text{B}}$ that is smaller than the light cone velocity of the system, while the front itself broadens diffusively in time.

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## PSI 2017/2018 - String Theory - Lecture 7

Wednesday Feb 28, 2018
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## Quantum Field Theory for Cosmology (AMATH872/PHYS785) - Lecture 14

Tuesday Feb 27, 2018
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## Next Public Lecture

Check back for details on the next lecture in Perimeter's Public Lectures Series

## RECENT PUBLIC LECTURE

### Emily Levesque: The Weirdest Stars in the Universe

Speaker: Emily Levesque