Generating coherent states of entangled spins

Hongyi Yu, Yu Luo, and Wang Yao
Phys. Rev. A 84, 032337 – Published 26 September 2011

Abstract

A coherent state of many spins contains quantum entanglement, which increases with a decrease in the collective spin value. We present a scheme to engineer this class of pure state based on incoherent spin pumping with a few collective raising or lowering operators. In a pumping scenario aimed for maximum entanglement, the steady state of N-pumped spin qubits realizes the ideal resource for the 1N2 quantum telecloning. We show how the scheme can be implemented in a realistic system of atomic spin qubits in an optical lattice. Error analysis shows that high-fidelity state engineering is possible for NO(100) spins in the presence of decoherence. The scheme can also prepare a resource state for the secret sharing protocol and for the construction of the large-scale Affleck-Kennedy-Lieb-Tasaki state.

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  • Received 21 April 2011

DOI:https://doi.org/10.1103/PhysRevA.84.032337

©2011 American Physical Society

Authors & Affiliations

Hongyi Yu, Yu Luo, and Wang Yao*

  • Department of Physics and Center of Theoretical and Computational Physics, The University of Hong Kong, Hong Kong, China

  • *wangyao@hkucc.hku.hk

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Issue

Vol. 84, Iss. 3 — September 2011

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