Perfect Transfer of Arbitrary States in Quantum Spin Networks

Christandl, M. and Datta, Nilanjana and Dorlas, T. C. and Ekert, A. and Kay, A. and Landahl, A. J. (2004) Perfect Transfer of Arbitrary States in Quantum Spin Networks. (Preprint)

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Abstract

We propose a class of qubit networks that admit perfect state transfer of any two-dimensional quantum state in a fixed period of time. We further show that such networks can distribute arbitrary entangled states between two distant parties, and can, by using such systems in parallel, transmit the higher dimensional systems states across the network. 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 2*log_3(N) is the maximal perfect communication distance for hypercube geometries. Moreover, if one allows fixed but different couplings between the qubits then perfect state transfer can be achieved over arbitrarily long distances in a linear chain. This paper expands and extends the work done in [1].

Item Type: Article
Divisions: School of Theoretical Physics > Preprints
Date Deposited: 19 Jun 2018 13:59
Last Modified: 16 Jul 2018 12:54
URI: http://dair.dias.ie/id/eprint/640

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