4 papers
Nonequivalence between absolute separability and positive partial transposition in the symmetric subspace
Jonathan Louvet, Eduardo Serrano-Ensástiga, Thierry Bastin +1
The equivalence between absolutely separable states and absolutely positive partial transposed (PPT) states in general remains an open problem in quantum entanglement theory. In th…
Quantum metrology of rotations with mixed spin states
Eduardo Serrano-Ensástiga, Chryssomalis Chryssomalakos, John Martin
The efficiency of a quantum metrology protocol can be significantly diminished by the interaction of the system with its environment, leading to a loss of purity and, as a result,…
Spin entanglement in antiferromagnetic spin-1 Bose-Einstein condensates
A. Santiago, F. Mireles, E. Serrano-Ensástiga
We study the spin entanglement in a spin-1 Bose-Einstein condensate with antiferromagnetic atomic interactions using the Hartree-Fock approach. Based on the isomorphism between sym…
Entangling power of symmetric multiqubit systems: a geometrical approach
Eduardo Serrano-Ensástiga, Diego Morachis Galindo, Jesús A. Maytorena +1
Unitary gates with high entangling capabilities are relevant for several quantum-enhanced technologies. For symmetric multiqubit systems, such as spin states or bosonic systems, th…