Perfect state transfers by selective quantum interferences within complex spin networks
| Autor: | Alvarez, Gonzalo A., Mishkovsky, Mor, Danieli, Ernesto P., Levstein, Patricia R., Pastawski, Horacio M., Frydman, Lucio |
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| Rok vydání: | 2010 |
| Předmět: | |
| Zdroj: | Phys. Rev. A 81, 060302(R) (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevA.81.060302 |
| Popis: | We present a method that implement directional, perfect state transfers within a branched spin network by exploiting quantum interferences in the time-domain. That provides a tool to isolate subsystems from a large and complex one. Directionality is achieved by interrupting the spin-spin coupled evolution with periods of free Zeeman evolutions, whose timing is tuned to be commensurate with the relative phases accrued by specific spin pairs. This leads to a resonant transfer between the chosen qubits, and to a detuning of all remaining pathways in the network, using only global manipulations. As the transfer is perfect when the selected pathway is mediated by 2 or 3 spins, distant state transfers over complex networks can be achieved by successive recouplings among specific pairs/triads of spins. These effects are illustrated with a quantum simulator involving 13C NMR on Leucine's backbone; a six-spin network. Comment: 5 pages, 3 figures |
| Databáze: | arXiv |
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