The Spin SYK Model: Quantum Gravity without Fermions

Friday Quantum Seminar

Michael Winer (JQI)
Friday, November 17, 2023 - 12:00pm
ATL 2324

We analyze a model of qubits which we argue has an emergent quantum gravitational description similar to the fermionic Sachdev-Ye-Kitaev (SYK) model. The model we consider is known as the quantum q-spin model because it features q-local interactions between qubits. It was previously studied as a model of a quantum spin glass, and while we find that the model is glassy for q=2, q=3, and likely q=4, we also find evidence for previously unexpected SYK-like behavior for the quenched free energy down to the lowest temperatures for q >= 5. This SYK-like physics includes power-law correlation functions and an extensive low temperature entropy, so we refer to the model as Spin SYK. The model is generic in that it includes all possible q-body couplings, lacks most symmetries, and has no spatial structure, so our results can be construed as establishing a certain ubiquity of quantum holography in systems dominated by many-body interactions.

Pizza and drinks will be served after the seminar in ATL 2117.