J4 ›› 2016, Vol. 33 ›› Issue (5): 553-560.

• Quantum Optics • Previous Articles     Next Articles

Quantum computation in decoherence-free subspaces for overcoming bit-flip erroe in cavity QED

Chen Yue-Yue, Liu Chengpu, Feng Xun-Li   

  1. 1 State Key Laboratory of High Field Laser Physics, Shanghai Institution of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; 2 University of Chinese Academy of Sciences, Beijing 100039, China; 3 Department of Physics, Shanghai Normal University, Shanghai 200234, China
  • Received:2015-01-04 Revised:2016-04-21 Published:2016-09-28 Online:2016-09-28

Abstract: A scheme for quantum computation avoiding collective bit-flip decoherence is presented. The scheme is based on a cavity system with several identical atoms trapped inside. By using two adjacent atoms to encode one logical qubit, a four-dimensional decoherence-free subspace free from collective bit-flip docoherence is constructed. We implement two noncommutative single-qubit operations and a controlled phase gate to realize the universal quantum computation in the decoherence-free subspace.

Key words: universal quantum computation