Theory Colloquia

Prospects for experimental quantum gravity

by Joseph Lykken

503/1-001 - Council Chamber (CERN)

503/1-001 - Council Chamber


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Understanding quantum gravity is one of the biggest intellectual challenges of modern science. String theory and the related AdS/CFT correspondence provide a rigorous theoretical laboratory to address some aspects of quantum gravity, and a few semi-classical quantum gravity effects, notably the existence of Hawking radiation, are well-established and understood. However we are strongly handicapped by the inability to perform experiments that probe quantum gravity effects directly. In recent years a series of results have established a promising pathway towards exhibiting and exploring genuine quantum gravity effects in a laboratory setting. This pathway exploits what appears to be a fundamental relationship between the connectedness of spacetime and quantum entanglement, as well as the holographic duality between certain bulk gravity phenomena and non-gravitational quantum systems. Both ideas are realized in the phenomenon of traversable wormholes, which have been shown in the rigorous context of AdS/CFT to be a feature of semi-classical quantum gravity. Such wormholes are rendered traversable by a quantum effect involving a flux of negative energy, similar to the quantum phenomenon that enables Hawking radiation. Furthermore these wormholes have a holographic dual description as a new form of quantum teleportation, which can be explicitly realized in the dynamics of the SYK model with N interacting Majorana fermions. There is considerable evidence that N~100 should be good enough to exhibit the key properties of traversable wormholes in a laboratory setting, e.g., by producing the dynamics on a quantum processor. I will describe how such experiments might be performed and what we could learn from them.

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Elena Gianolio
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AVC support account, Zoom Recording Operations 2, Irene Valenzuela Agui, Thomas Nik Bazl Fard, Samuel Abreu, Urs Wiedemann, Alexander Zhiboedov, Pier Francesco Monni, Chiara Caprini, Pascal Pignereau, Clement Montcharmont, Benoit Loyer
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