Perfect state transfers by selective quantum interferences within complex spin networks

Details Perfect state transfers by selective quantum interferences within complex spin networks Perfect state transfers by selective quantum interferences within complex spin networks

2010-05-14

arxiv.org/abs/1005.2593v1

Phys. Rev. A 81, 060302(R) (2010)

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevA.81.060302

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.

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