173 citations · 471 across the 12 of their papers we have counts for
12 papers
Quantum fidelity measures for mixed states
Yeong-Cherng Liang, Yu-Hao Yeh, Paulo E. M. F. Mendonça +3
Applications of quantum technology often require fidelities to quantify performance. These provide a fundamental yardstick for the comparison of two quantum states. While this is s…
Maximally entangled mixed states for qubit-qutrit systems
Paulo E. M. F. Mendonca, Marcelo A. Marchiolli, Samuel R. Hedemann
We consider the problems of maximizing the entanglement negativity of X-form qubit-qutrit density matrices with (i) a fixed spectrum and (ii) a fixed purity. In the first case, the…
Maximally genuine multipartite entangled mixed X-states of N-qubits
Paulo E. M. F. Mendonca, Seyed Mohammad Hashemi Rafsanjani, Diógenes Galetti +1
For every possible spectrum of -dimensional density operators, we construct an -qubit X-state of same spectrum and maximal genuine multipartite (GM-) concurrence, hence cha…
Heuristic for estimation of multiqubit genuine multipartite entanglement
Paulo E. M. F. Mendonca, Marcelo A. Marchiolli, Gerard J. Milburn
For every N-qubit density matrix written in the computational basis, an associated "X-density matrix" can be obtained by vanishing all entries out of the main- and anti-diagonals.…
Entanglement universality of two-qubit X-states
Paulo E. M. F. Mendonca, Marcelo A. Marchiolli, Diógenes Galetti
We demonstrate that for every two-qubit state there is a X-counterpart, i.e., a corresponding two-qubit X-state of same spectrum and entanglement, as measured by concurrence, negat…
Theoretical formulation of finite-dimensional discrete phase spaces: II. On the uncertainty principle for Schwinger unitary operators
Marcelo A. Marchiolli, Paulo E. M. F. Mendonca
We introduce a self-consistent theoretical framework associated with the Schwinger unitary operators whose basic mathematical rules embrace a new uncertainty principle that general…