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Physics Letters A

Controllable entanglement transfer via two parallel spin chains

Zhong‐Xiao Man, Nguyen Ba An, Yun‐Jie Xia, Jaewan Kim

Published Jun 1, 2014• 7 citations
Publisher
DOI
10.1016/j.physleta.2014.05.046

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The effect of weak measurement (WM) and quantum measurement reversal (QMR) on the entanglement transfer in two parallel Heisenberg spin chains is investigated. We find that the entanglement transfer can be enhanced by the WM and QMR control for different N ( N is the length of each spin chain) and m ( m denotes the m th spin pair). More interestingly, we also find that, in the thermodynamic limit where the so-called phase-shift control is invalid, the WM and QMR control is instead very effective. So this investigation indicates that the WM and QMR approach has potential applications in quantum information processing based on the spin chain.
We investigate the effect of phase shift on the entanglement transfer in two parallel 1D spin chains. We calculate the concurrence, measures for two-qubit entanglement, as a function of time. We find the maximum achievable entanglement in the cases with and without phase shift. Although the entanglement transfer becomes slow in most cases with phase shift, the significant enhancement of the maximum achievable entanglement is obtained which suggests its potential usefulness in quantum information processing.