Perfect Transfer of Quantum Information in Spin Chain with a Weak Magnetic Field

Abstract

Abstract: One of the critical tasks in quantum information is to realize quantum information transfer with high fidelity. Based on the theory of perfect transfer of single bit quantum information in spin chain, the influences for quantum information transfer of two kinds of magnetic fields in N = 5 spin chain are studied respectively by the method that Hamiltonian of the system is diagonalized. It is shown that the uniform poor magnetic field does not affect the perfect transfer of quantum information, and for the poor magnetic field with antisymmetry about the chain center and with mean variation in space, the condition to realize perfect transfer of quantum information is determined by the magnetic field strength difference, B: the stronger the magnetic field is, the shorter the time to achieve perfect transmission; the weaker the magnetic field is, the longer it takes.

Key words: Quantum information, Information transfer, Dynamical evolution, Spin chain

WANG Qingliang1, REN Hengfeng1*, XU Lingxia1. Perfect Transfer of Quantum Information in Spin Chain with a Weak Magnetic Field[J]. Chinese Journal of Quantum Electronics.

References

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