Monday, July 15, 2013

1307.3465 (Morteza Rafiee et al.)

Noise lubricating qubit transfer in a spin network    [PDF]

Morteza Rafiee, Cosmo Lupo, Stefano Mancini
We consider quantum state transfer in a fully connected spin network. Although it results impossible to achieve high fidelity by free dynamics, we show that the addition of noise can be extremely helpful for this purpose. We prove that the presence of Gaussian white noise in spin-spin couplings (edges), except those linked to the input/output node, enhances the fidelity of state transfer. The observed noise benefit is scale free as it applies to quantum network of any size. The amount of the fidelity enhancement, depending on the noise strength as well as on the number of edges to which it is applied, can be so high to take the fidelity close to one.
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