Chinese Journal of Quantum Electronics, Volume. 33, Issue 5, 553(2016)
Quantum computation in decoherence-free subspaces for overcoming bit-flip error in cavity QED
Universal quantum computation overcoming influnce of bit-flip error is realized by suppressing collective decoherence with decoherence-free subspace method. The scheme is based on cavity QED system. A logical bit is encoded by two adjacent atoms trapped in a cavity, and a four-dimensional decoherence-free subspace is constructed to suppress the collective bit reversal error. By adjusting the coupling between the external optical field and cavity, two noncommutative single-qubit operations and a controlled phase gate are implemented in decoherence-free subspace. Universal quantum computation overcoming the collective bit reversal error is realized.
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CHEN Yueyue, LIU Chengpu, FENG Xunli. Quantum computation in decoherence-free subspaces for overcoming bit-flip error in cavity QED[J]. Chinese Journal of Quantum Electronics, 2016, 33(5): 553
Received: Jan. 4, 2015
Accepted: --
Published Online: Oct. 21, 2016
The Author Email: Yueyue CHEN (chenyueyue@siom.ac.cn)