Department of Physics & Astronomy
University of New Mexico

CQuIC Seminars

Quantum algorithms for thermal state preparation using fluctuation theorems

Presented by Gopikrishnan Muraleedharan (LANL)

Fluctuation theorems provide a correspondence between properties of quantum systems in thermal equilibrium and a work distribution arising in a non-equilibrium process that connects two quantum systems. In this talk, I will describe a quantum algorithm we recently developed to prepare the thermal state (purification) of a target Hamiltonian H1, from the thermal state of initial Hamiltonian H0. The complexity of the algorithm is exponential in the norm of perturbation rather than the norm of the Hamiltonian like in previous works. This results in a huge improvement when the perturbation is small. I will also discuss the dependence of complexity on other parameters like precision.

The preprint for the work discussed can be found at arXiv:2203.08882.

3:30 pm, Thursday, May 12, 2022

Disability NoticeIndividuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact the Physics Department (phone: 505-277-2616, email: well in advance to ensure your needs are accomodated. Event handouts can be provided in alternative accessible formats upon request. Please contact the Physics front office if you need written information in an alternative format.

A schedule of talks within the Department of Physics and Astronomy is available on the P&A web site at