RT Journal Article
T1 Hamiltonian forging of a thermofield double
A1 Faílde, Daniel
A1 Santos Suárez, Juan
A1 Herrera Martí, David A.
A1 Mas Solé, Javier
AB We address the variational preparation of the thermofield double as the ground state of a suitably engineered Hamiltonian acting on the doubled Hilbert space. Through the use of the Entanglement Forging ansatz, we propose a solution that involves only circuits of width 𝑁. We illustrate the method with generic fermionic Hamiltonians. The free fermion case can be solved in closed form and yields a warm start state for the variational circuits whenever interactions are present. As an important side product, this method returns the complete energy spectrum and eigenbasis of the system.
PB American Physical Society
SN 2469-9926
YR 2025
FD 2025-01-21
LK https://hdl.handle.net/10347/42853
UL https://hdl.handle.net/10347/42853
LA eng
NO Faílde, D., Santos Suárez, J., Herrera Martí, D. A. & Mas Solé, J. (2025). Hamiltonian forging of a thermofield double, 111(1), 1-13. https://doi.org/10.1103/PhysRevA.111.012432
DS Minerva
RD 28 abr 2026