# 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 2016/2017 Foundations of Quantum Mechanics (Review) - Lecture 1

Tuesday Jan 03, 2017
Speaker(s):

## PSI 2016/2017 Gravitational Physics (Review) - Lecture 1

Tuesday Jan 03, 2017
Speaker(s):

## PSI 2016/2017 Standard Model (Review) - Lecture 1

Tuesday Jan 03, 2017
Speaker(s):

## Theory and Experimental Platform for Bosonic Symmetry Protected Topological Phases

Tuesday Dec 20, 2016
Speaker(s):

Bosonic symmetric protected topological (BSPT) phases are bosonic anagolue of electron topological insulators and superconductors. Despite the theoretical progresses of classifying these states, little attention has been paid to experimental realization of BSPT states in dimensions higher than 1. We propose bilayer graphene system in a out-of-plane magnetic field with Coulomb interaction is a natural platform for BSPT states with $U(1)\times U(1)$ symmetry.

Collection/Series:
Scientific Areas:

## Bouncing

Tuesday Dec 20, 2016
Speaker(s):

In this talk, I will focus on cosmologies that replace the big bang with a big bounce. I will explain how, in these scenarios, the large-scale structure of the universe is determined during a contracting phase before the bounce and will describe the recent development of the first well-behaved classical (non-singular) cosmological bounce solutions.

Collection/Series:

## Matrix product state evolutions of quantum fields in curved space

Thursday Dec 15, 2016
Speaker(s):

The matrix product state (MPS) ansatz makes possible computationally-efficient representations of weakly entangled many-body quantum systems with gapped Hamiltonians near their ground states, notably including massive, relativistic quantum fields on the lattice. No Wick rotation is required to apply the time evolution operator, enabling study of time-dependent Hamiltonians. Using free massive scalar field theory on the 1+1 Robertson-Walker metric as a toy example, I present early efforts to exploit this fact to model quantum fields in curved spacetime.

Collection/Series:
Scientific Areas:

## Approaching Lattice Gauge Theories with Tensor Networks – From real-time dynamics to overcoming the sign problem - Stefan Kühn

Thursday Dec 15, 2016

In recent years there has been quite some effort to apply Matrix Product States (MPS) and more general Tensor Networks (TN) to lattice gauge theories. Contrary to the standard Euclidean-time Monte Carlo approach, which faces a major obstacle in the sign problem, numerical methods based on TN are free from the sign problem and allow to some extent simulating time evolution. Moreover, TN are also a suitable tool to explore proposals for potential future quantum simulators for lattice gauge theories.

Collection/Series:

## Non-holonomic tomography and detecting state-preparation and measurement correlated errors

Wednesday Dec 14, 2016
Speaker(s):

Quantum tomography is an important tool for characterizing the parameters of unknown states, measurements, and gates.  Standard quantum tomography is the practice of estimating these parameters with known measurements, states, or both, respectively.  In recent years, it has become important to address the issue of working with systems where the devices'' used to prepare states and make measurements both have significant errors.  Of particular concern to me is whether such state-preparation and measurement errors are correlated with each other.  In this talk,

## Tensor Network Algorithms for 2D Strongly Correlated Systems

Wednesday Dec 14, 2016
Speaker(s):

In this talk I will give a short introduction into Projected Entangled-Pair States (PEPS), and their infinite variant iPEPS, a class of tensor network Ansatz targeted at the simulation of 2D strongly correlated systems. I will present work on two recent

Collection/Series:

## Entanglement negativity in topologically ordered phases

Tuesday Dec 13, 2016
Speaker(s):

Unlike entanglement entropy and mutual information which may mix both classical and quantum correlations, entanglement negativity received extensive interest recently, for its merit of measuring the pure quantum entanglement in the system. In this talk, I will introduce the entanglement negativity in 2+1 dimensional topologically ordered phases. For a bipartitioned or tripartitioned spatial manifold, we show how the universal part of entanglement negativity depends on the presence of quasiparticles and the choice of ground states.

Collection/Series:
Scientific Areas:

## Next Public Lecture

### THE PHYSICS OF WALL STREET

Wednesday Feb 01, 2017

## RECENT PUBLIC LECTURE

### Molly Shoichet: Engineering Change in Medicine

Speaker: Molly Shoichet