J4 ›› 2010, Vol. 27 ›› Issue (3): 300-307.

• Quantum Optics • Previous Articles     Next Articles

The effection of pulse bandwidth to preparation of entangled states by adiabatic passage

TU Jie1, HU Lian2   

  1. 1 Zhuhai College Jilin University, Zhuhai, 519041, China; 
    2 Dept. of Physics, South China Normal University, Guangzhou, 510006, China
  • Received:2009-11-09 Revised:2010-01-11 Published:2010-05-28 Online:2010-05-11

Abstract:

The exact solution of Schr?dinger equation for two spin-1/2 particles under the rotating magnetic field is obtained. Pulse bandwidth, as a crucial factor in population transfer, is proposed. We analysed the figures of energy and population, concluded that bandwidth of pulse decides if there is an exchange between states at the places of energy degeneracy. Comparing our result with R.G.Unanyan’s, it is found that whether the adiabatic condition is satisfied exactly or not is not so important, and the adiabatic condition that they derived may not be a reliable criterion for preparing entangled states.

Key words: quantum optics∣pulse bandwidth∣exact solution∣adiabatic condition∣ entangled states