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IQIM Postdoctoral and Graduate Student Seminar

Thursday, April 9, 2020
12:00pm to 1:00pm
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Online Event
Teleportation by size, traversable wormholes, and quantum gravity in the lab
Sepehr Ghazi Nezami, Sherman Fairchild Postdoctoral Scholar in Theoretical Physics, Preskill group,

Abstract: With the long-term goal of studying quantum gravity in the lab, we propose holographic teleportation protocols that can be readily executed in table-top experiments. These protocols exhibit similar behavior to that seen in recent traversable wormhole constructions: information that is scrambled into one half of an entangled system will, following a weak coupling between the two halves, unscramble into the other half. We introduce the concept of "teleportation by size" to capture how the physics of operator-size growth naturally leads to information transmission. The transmission of a signal through a semi-classical holographic wormhole corresponds to a rather special property of the operator-size distribution we call "size winding". For more general setups (which may not have a clean emergent geometry), we argue that imperfect size winding is a generalization of the traversable wormhole phenomenon. For example, a form of signalling continues to function at high temperature and at large times for generic chaotic systems, even though it does not correspond to a signal going through a geometrical wormhole, but rather to an interference effect involving macroscopically different emergent geometries. Finally, we outline implementations feasible with current technology in two experimental platforms: Rydberg atom arrays and trapped ions.

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Talks will also be posted on IQIM's YouTube page (Link to be updated following the talk)

For more information, please contact Marcia Brown by phone at 626-395-4013 or by email at [email protected].