Multipartite entanglement structure in the Eigenstate Thermalization Hypothesis

Understand

We study the quantum Fisher information (QFI) and, thus, the multipartite entanglement structure of thermal pure states in the context of the Eigenstate Thermalization Hypothesis (ETH).

• In both the canonical ensemble and the ETH, the quantum Fisher information may be explicitly calculated from the response functions.
• In the case of ETH, we find that the expression of the QFI bounds the corresponding canonical expression from above.
• This implies that although average values and fluctuations of local observables are indistinguishable from their canonical counterpart, the entanglement structure of the state is starkly different; with the difference amplified, e.g., in the proximity of a thermal phase transition.