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56 papers · 1 filter
Determining the N-representability of a reduced density matrix via unitary evolution and stochastic sampling
Gustavo. E. Massaccesi, Ofelia. B. Oña, Pablo Capuzzi +6
The N-representability problem consists in determining whether, for a given p-body matrix, there exists at least one N-body density matrix from which the p-body matrix can be obtai…
Optimal quantum teleportation protocols for fixed average fidelity
Fabricio Toscano, Diego G. Bussandri, Gustavo M. Bosyk +2
We demonstrate that among all quantum teleportation protocols giving rise to the same average fidelity, those with aligned Bloch vectors between input and output states exhibit the…
Ground state separability and criticality in interacting many-particle systems
F. Petrovich, N. Canosa, R. Rossignoli
We analyze exact ground state (GS) separability in general particle systems with two-site couplings. General necessary and sufficient conditions for full separability, in the f…
Symmetry and degeneracy, exceptional point and coalescence: a pedagogical approach
Francisco M. Fernández
We show a parameter-dependent non-Hermitian matrix that exhibits both degeneracy and coalescence of eigenvalues at an exceptional point (Hermitian and non-Hermitian deg…
Quasi-Hermitian one-dimensional lattice
Francisco M. Fernández
We show that a non-Hermitian operator with a tridiagonal matrix representation in a finite-dimensional vector space is similar to an Hermitian operator. The required condition is s…
Comment on: "Threading dislocation densities in semiconductor crystals: A geometric approach". Phys. Lett. A 376 (2012) 2838-2841
Francisco M. Fernández
We analyze the solution of the Schrödinger equation arising in the treatment of a geometric model introduced to explain the origin of the observed shallow levels in semiconductors…