Perfect state transfer in quantum spin networks.

  title={Perfect state transfer in quantum spin networks.},
  author={Matthias Christandl and Nilanjana Datta and Artur Ekert and Andrew J. Landahl},
  journal={Physical review letters},
  volume={92 18},
We propose a class of qubit networks that admit the perfect state transfer of any quantum state in a fixed period of time. Unlike many other schemes for quantum computation and communication, these networks do not require qubit couplings to be switched on and off. When restricted to N-qubit spin networks of identical qubit couplings, we show that 2log3N is the maximal perfect communication distance for hypercube geometries. Moreover, if one allows fixed but different couplings between the… CONTINUE READING
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