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# Quantum Information

### Video Brief

## Patrick Hayden | Decoding Spacetime

## The Quantum Computational Universe - 2 of 2

## The Quantum Computational Universe - 1 of 2

Professor Patrick Hayden of the Stanford Institute for Theoretical Physics (SITP) introduces the science of quantum information.

## Multipartite Entanglement

## Entanglement and Complexity: Gravity and Quantum Mechanics

## Complexity Equals Action

## Gravity and Entanglement

## "ER = EPR" or "What's Behind the Horizons of Black Holes?" (Lecture 2)

## "ER = EPR" or "What's Behind the Horizons of Black Holes?" (Lecture 1)

ER = EPR is a shorthand that joins two ideas proposed by Einstein in 1935. One involved the paradox implied by what he called “spooky action at a distance” between quantum particles (the EPR paradox, named for its authors, Einstein, Boris Podolsky and Nathan Rosen). The other showed how two black holes could be connected through far reaches of space through “wormholes” (ER, for Einstein-Rosen bridges). At the time that Einstein put forth these ideas — and for most of the eight decades since — they were thought to be entirely unrelated.

### News Item

## Pages

**Quantum Information at SITP**

One of the defining features of quantum mechanics is the Heisenberg Uncertainty Principle, which imposes unbreakable limits on our knowledge of reality. Despite these restrictions, quantum mechanical particles can do amazing things like exist at two different locations at the same time. Quantum information science aims to explore the nature of information at the quantum level, a world in which bits can be both zero and one at the same time and perfect copying is impossible.

At the practical level, quantum information powers forms of secure communication that are provably impossible in a “classical” world. Likewise, an intrinsically quantum-mechanical computer could efficiently solve problems that are intractable for any computer of more traditional design, the most notorious example being that a quantum computer could crack most of the codes used to secure the internet.

Quantum information researchers at SITP have played an important role in the development of the basic theory of quantum communication. They continue to search for better ways to protect quantum computers from noise and communications from prying eavesdroppers. A unique feature of the quantum information group at SITP, however, is its close integration and participation in research on quantum gravity and black holes. Stanford is at the forefront of exploring the role of quantum entanglement to the geometry of space, the importance of quantum error correction in black hole evaporation, and even the relevance of computational complexity to stability of space.

Submitted by Donald Joseph Abuy on Tue, 07/17/2018 - 10:09

This talk by Patrick Hayden will provide a tour of some of the recent developments at the intersection of quantum information and fundamental physics that are the source of this renewed excitement.

Submitted by Kevin Wells on Wed, 12/14/2016 - 13:17

Professor Patrick Hayden of the Stanford Institute for Theoretical Physics (SITP) introduces the science of quantum information.

Submitted by Kevin Wells on Wed, 12/14/2016 - 13:13

Submitted by Kevin Wells on Tue, 11/10/2015 - 13:14

Sandu Popescu discusses multipartite entanglement with the It From Qubit Simons Collaboration team at the Stanford Institute for Theoretical Physics.

Submitted by Kevin Wells on Tue, 11/10/2015 - 13:20

Professor Leonard Susskind describes how gravity and quantum information theory have come together to create a new way of thinking about physical systems. From fluid dynamics to strange metals, from black holes to the foundations of quantum mechanics, almost all areas of physics are being touched by the new paradigm.

Submitted by Kevin Wells on Fri, 11/06/2015 - 07:13

Brian Swingle of the Stanford Institute for Theoretical Physics discusses the latest research in Black Hole complexity and computational power at the 2015 SITP Templeton Conference.

Submitted by Kevin Wells on Fri, 11/06/2015 - 06:57

Professor Mark van Raamsdonk of the University of British Columbia gives the Stanford Physics and Applied Physics Colloquium on October 13, 2015.

Submitted by Kevin Wells on Mon, 11/03/2014 - 04:41

ER = EPR is a shorthand that joins two ideas proposed by Einstein in 1935. One involved the paradox implied by what he called “spooky action at a distance” between quantum particles (the EPR paradox, named for its authors, Einstein, Boris Podolsky and Nathan Rosen). The other showed how two black holes could be connected through far reaches of space through “wormholes” (ER, for Einstein-Rosen bridges). At the time that Einstein put forth these ideas — and for most of the eight decades since — they were thought to be entirely unrelated.

Submitted by Kevin Wells on Wed, 10/22/2014 - 01:00

Dec 18 2018

It from Qubit, the Simons Collaboration on Quantum Fields, Gravity, and Information, anticipates appointing several postdoctoral fellows starting in the fall of 2019.