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Showing 2009 · quant-phShow all
3 papers · 2 filters
quant-ph2009★ 35 cited
Generalization of the Hellmann-Feynman theorem
J. G. Esteve, F. Falceto, C. García Canal
The well known Hellmann-Feynman theorem of Quantum Mechanics connected with the derivative of the eigenvalues with respect to a parameter upon which the Hamiltonian depends, is gen…
quant-ph2009★ 40 cited
Factorization and entanglement in general XYZ spin arrays in non-uniform transverse fields
R. Rossignoli, N. Canosa, J. M. Matera
We determine the conditions for the existence of a pair of degenerate parity breaking separable eigenstates in general arrays of arbitrary spins connected through couplings o…
quant-ph2009★ 17 cited
Entanglement between distant qubits in cyclic XX chains
N. Canosa, R. Rossignoli
We evaluate the exact concurrence between any two spins in a cyclic XX chain of n spins placed in a uniform transverse magnetic field, both at zero and finite temperature, by means…