J4 ›› 2018, Vol. 35 ›› Issue (4): 439-443.

• Quantum Optics • Previous Articles     Next Articles

Research on quantum information transfer in spin chain with N=4 in low-intensity magnetic field

WANG Qingliang, REN Hengfeng   

  1. Department of Physics, Xinzhou Teachers University, Xinzhou 034000, China
  • Received:2017-06-05 Revised:2017-10-18 Published:2018-07-28 Online:2018-07-12

Abstract:

Based on the theory of quantum information transfer in spin chain, the effects of two types of magnetic field are investigated for a single qubit information transfer in spin chain with N=4 in . For the spin chain in some magnetic fields, Hamiltonian of the system is diagonalized, and the dynamic behavior of information transfer is considered in magnetic field. Results show that the low-intensity magnetic field which is uniform in space and constant in time has nothing to do with quantum information transfer. The low-intensity magnetic field with the difference value B between the nearest-neighbor lattices and the symmetrical direction to center of the spin chain plays a key role for quantum information transfer. Particularly, for the perfect transfer with fidelity value of 1, the transferring condition is dependent on the magnetic parameter B to a certain extent.

Key words: quantum information; information transfer; dynamical evolution; spin chain

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