Spin Star as Switch for Quantum Networks

Details Spin Star as Switch for Quantum Networks Spin Star as Switch for Quantum Networks

2007-05-10

arxiv.org/abs/0705.1560v2

J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 135504

Physics

Quantum Physics

10 pages, 2 figure

Scientific paper

10.1088/0953-4075/44/13/135504

Quantum state transfer is an important task in quantum information processing. It is known that one can engineer the couplings of a one-dimensional spin chain to achieve the goal of perfect state transfer. To leverage the value of these spin chains, a spin star is potentially useful for connecting di?erent parts of a quantum network. In this work, we extend the spin-chain engineering problem to the problems with a topology of a star network. We show that a permanently coupled spin star can function as a network switch for transferring quantum states selectively from one node to another by varying the local potentials only. Together with one-dimensional chains, this result allows applications of quantum state transfer be applied to more general quantum networks.

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