Thursday, January 10, 2013

1301.1774 (S. Lorenzo et al.)

Quantum-state transfer via resonant tunnelling through local field
induced barriers

S. Lorenzo, T. J. G. Apollaro, A. Sindona, F. Plastina
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 appearance of two eigenstates, bi-localized 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.
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