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14 results on '"Plastina F"'

13. Quantum-state transfer via resonant tunneling through local-field-induced barriers

Author

Tony J. G. Apollaro, Salvatore Lorenzo, Francesco Plastina, A. Sindona, Lorenzo, S, Apollaro, T, Sindona, A, and Plastina, F

Subjects
DYNAMICS, DISORDER, Physics, DOTS, Quantum Physics, ENTANGLEMENT, CHAINS, PROPAGATION, QUBITS, Condensed matter physics, Spins, FOS: Physical sciences, Settore FIS/03 - Fisica Della Materia, Atomic and Molecular Physics, and Optics, Magnetic field, Condensed Matter - Other Condensed Matter, Quality (physics), Chain (algebraic topology), Qubit, Quantum Physics (quant-ph), Quantum information science, Local field, Quantum tunnelling, Other Condensed Matter (cond-mat.other)
Abstract

Efficient quantum-state transfer is achieved in a uniformly coupled spin-1/2 chain, with open boundaries, by application of local magnetic fields on the second and last-but-one spins, respectively. These effective barriers induce the appearance of two eigenstates, bilocalized at the edges of the chain, which allow a high-quality transfer also at relatively long distances. The same mechanism may be used to send an entire e-bit (e.g., an entangled qubit pair) from one to the other end of the chain. DOI: 10.1103/PhysRevA.87.042313

Published
2013
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14. Dynamics of entanglement in one-dimensional spin systems

Author

Andreas Osterloh, G. Massimo Palma, Rosario Fazio, Francesco Plastina, Luigi Amico, Amico, L, Osterloh, A, Plastina, F, Fazio, Rosario, Massimo Palma, G., L AMICO, A OSTERLOH, F PLASTINA, R FAZIO, and PALMA GM

Subjects
Physics, Quantum Physics, Bell state, Strongly Correlated Electrons (cond-mat.str-el), STATISTICAL MECHANICS, FOS: Physical sciences, XY-MODEL, Quantum entanglement, Squashed entanglement, Multipartite entanglement, QUANTUM STATES, Atomic and Molecular Physics, and Optics, Condensed Matter - Strongly Correlated Electrons, Local hidden variable theory, Bell's theorem, Quantum mechanics, Quantum Physics (quant-ph), Entanglement witness, Quantum computer
Abstract

We study the dynamics of quantum correlations in a class of exactly solvable Ising-type models. We analyze in particular the time evolution of initial Bell states created in a fully polarized background and on the ground state. We find that the pairwise entanglement propagates with a velocity proportional to the reduced interaction for all the four Bell states. Singlet-like states are favored during the propagation, in the sense that triplet-like states change their character during the propagation under certain circumstances. Characteristic for the anisotropic models is the instantaneous creation of pairwise entanglement from a fully polarized state; furthermore, the propagation of pairwise entanglement is suppressed in favor of a creation of different types of entanglement. The ``entanglement wave'' evolving from a Bell state on the ground state turns out to be very localized in space-time. Further support to a recently formulated conjecture on entanglement sharing is given., Comment: 25 pages, 21 figures; revtex

Published
2004
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