920 citations · 16.6k across the 212 of their papers we have counts for
13 papers · 1 filter
Semi-Classical Discretization and Long-Time Evolution of Variable Spin Systems
Giovani E. Morales-Hernández, Juan C. Castellanos, José L. Romero +1
We apply the semi-classical limit of the generalized map for representation of variable-spin systems in a four-dimensional symplectic manifold and approximate their evoluti…
Taming singularities of the quantum Fisher information
Aaron Z. Goldberg, José L. Romero, Ángel S. Sanz +1
Quantum Fisher information matrices (QFIMs) are fundamental to estimation theory: they encode the ultimate limit for the sensitivity with which a set of parameters can be estimated…
Truncated Wigner approximation as a non-positive Kraus map
A. B. Klimov, I. Sainz, J. L. Romero
We show that the Truncated Wigner Approximation developed in the flat phase-space is mapped into a Lindblad-type evolution with an indefinite metric in the space of linear operator…
Correlation transfer in large-spin chains
I. F. Valtierra, J. L. Romero, A. B. Klimov
It is shown that transient spin-spin correlations in one-dimensional spin S>>1 chain can be enhanced for initially factorized and individually squeezed spin states. Such correlatio…
Discrete phase-space structure of -qubit mutually unbiased bases
A. B. Klimov, J. L. Romero, G. Bjork +1
We work out the phase-space structure for a system of qubits. We replace the field of real numbers that label the axes of the continuous phase space by the finite field $\Gal{2…
Quantum light depolarization: the phase-space perspective
A. B. Klimov, J. L. Romero, L. L. Sanchez-Soto +2
Quantum light depolarization is handled through a master equation obtained by coupling dispersively the field to a randomly distributed atomic reservoir. This master equation is so…