4 problems

Let the $(M,L)$-partitioned Hamiltonians be the Hamiltonians referred to as … have a spectrum. In the leading-order approximation, the partitioned-Hamiltonian unitarity conjecture.…

Let $H_{kin}$ be the kinetic, or hopping, part of the Bose–Hubbard Hamiltonian, let $u$ be the parameter of the quantum infinite-temperature state … where $A$ is an observable and…

Let $H_{\rm BH}$ be the two-mode Bose–Hubbard Hamiltonian, let $\Psi_N$ be its ground state, and let $\gamma_{\Psi_N}^{(1)}$ denote the one-body density matrix of $\Psi_N$. Let…

For a Bose–Hubbard dimer with complex interaction strength, let an initially condensed many-particle state remain condensed under the non-Hermitian dynamics, and let expectation va…