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Chinese Physics Letters

Entanglement Transfer and Periodic Sudden Death Phenomenon in Two Parallel 1D Spin Chains of Quantum Spin Network

Zhao-Ming Wang, Shao Bin, Zou Jian

Published Apr 1, 2007• 6 citations
Publisher

Abstract

We investigate the entanglement transfer in two parallel 1D spin chains of a quantum spin network, and show that the perfect entanglement transfer can be realized at some special times. In addition, the so-called `sudden death' phenomenon of entanglement is found in the spin network system.
DOI
10.1088/0256-307x/24/4/003

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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 NNN-qubit spin networks of identical qubit couplings, we show that 2log3N2\phantom{\rule{0.2em}{0ex}}{\mathrm{log}}_{3}N2log3​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 by Christandl et al., Phys. Rev. Lett. 92, 187902 (2004).