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How to Build the Thermofield Double State

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arxiv 1811.11528 v2 pith:BIV6BMR7 submitted 2018-11-28 hep-th cond-mat.str-elquant-ph

classification hep-thcond-mat.str-elquant-ph
keywords doublestatethermofieldsystemhamiltonianpreparequantumapproximately
verification ladder T0 review T1 audit T2 compute T3 formal
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Given two copies of any quantum mechanical system, one may want to prepare them in the thermofield double state for the purpose of studying thermal physics or black holes. However, the thermofield double is a unique entangled pure state and may be difficult to prepare. We propose a local interacting Hamiltonian for the combined system whose ground state is approximately the thermofield double. The energy gap for this Hamiltonian is of order the temperature. Our construction works for any quantum system satisfying the Eigenvalue Thermalization Hypothesis.

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Cited by 3 Pith papers

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  3. Size Operator and Spectral Clustering in the Two Coupled SYK Model

    hep-th 2026-08 conditional novelty 6.0 of 10

    The finite-N spectrum of the two coupled SYK model organizes into operator-size clusters that underlie the conformal towers, revival dynamics, and wormhole-black hole transition.

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