Bharath Sambasivam, TEPID-ADAPT: Variational thermal state preparation at low temperatures[NT Seminar]

Friday 14 Feb 2025, 11:00 → 13:00 US/Eastern

Adaptive variational quantum algorithms have found a wide range of applications in physics and chemistry, especially for ground-state preparation. Preparing Gibbs states, which describe systems in equilibrium at finite temperatures on quantum computers is of great importance, particularly at low temperatures. In this talk, I will introduce our new method- TEPID-ADAPT- to prepare the thermal Gibbs state of a given Hamiltonian at low temperatures using a quantum variational method that is partially adaptive and uses a minimal number of ancillary qubits. Beyond preparing Gibbs states, this method also straightforwardly gives us access to the truncated low energy eigenspectrum of the Hamiltonian.