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In [1] we discussed how quantum gravity may be simulated using quantum devices and gave a specific proposal—teleportation by size and the phenomenon of size-winding. Here we elaborate on what it means to do ‘Quantum Gravity in the Lab’ and how size-winding connects to bulk gravitational physics and traversable wormholes. Perfect size-winding is a remarkable, fine-grained property of the size wavefunction of an operator; we show from a bulk calculation that this property must hold for quantum systems with a nearly-AdS2 bulk. We then examine in detail teleportation by size in three systems: the Sachdev-Ye-Kitaev model, random matrices, and spin chains, and discuss prospects for realizing these phenomena in near-term quantum devices.

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