F. Uskov

activity

20182025

most citedA variational lower bound on the ground state of a many-body system and the squaring parametrization of density matrices

6 citations · 6 across the 1 of their papers we have counts for

collaborators

2 papers

quant-ph2019★ 6 cited

A variational lower bound on the ground state of a many-body system and the squaring parametrization of density matrices

F. Uskov, O. Lychkovskiy

A variational upper bound on the ground state energy $E_{gs}$ of a quantum system, $E_{gs} ⩽ ⟨ Ψ∣ H ∣Ψ ⟩$ , is well-known (here $H$ is the Hamiltonian of t…

quant-ph2018

Merits of using density matrices instead of wave functions in the stationary Schrödinger equation for systems with symmetries

E. Shpagina, F. Uskov, N. Il'in +1

The stationary Schrödinger equation can be cast in the form $H ρ = E ρ$ , where $H$ is the system's Hamiltonian and $ρ$ is the system's density matrix. We explore the merits of this…