Notes

Brandao-Harrow limitation beyond 2-local Hamiltonians?

We argue that the Brandao-Harrow limitation does not extend to 4-local Hamiltonians.

Quantum union bound

A remark on the recent O'Donnell-Ventakeswaran proof and Sen proof.

Learning commuting hamiltonian from Gibbs state

A note on time-efficient algorithm for learning commuting lattice hamiltonian from its Gibbs state.