Noise to lubricate qubit transfer in a spin network
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Rafiee-2013-Noise to lubricate.pdf
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834.96 KB
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Author(s)
Rafiee, Morteza
Lupo, Cosmo
Mancini, Stefano
Date Issued
September 2013
Journal
Physical Review A
Publisher
American Physical Society
Citation
Rafiee, Morteza, Cosmo Lupo, and Stefano Mancini. “Noise to lubricate qubit transfer in a spin network.” Physical Review A 88, no. 3 (September 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We consider quantum state transfer in a fully connected spin network, in which the results indicate that it is impossible to achieve high fidelity by free dynamics. However, the addition of certain kinds of noise can be helpful for this purpose. In fact, we introduce a model of Gaussian white noise affecting the spin-spin couplings (edges), except those linked to the input and output node, and prove that it enhances the fidelity of state transfer. The observed noise benefit is scale free as it applies to a 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 as to take the fidelity close to one.
MIT Department
Massachusetts Institute of Technology. Research Laboratory of Electronics
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.88.032325
