Distributed quantum computing in decoherence-free subspace via adiabatic passage

作者：Chen, Ju Mei^*; Liang, Lin Mei; Li, Cheng Zu; Chen, Ping Xing; Dai, Hong Yi

来源：Optics Communications, 2009, 282(15): 3181-3184.

DOI：10.1016/j.optcom.2009.04.040

A scheme is proposed to implement distributed quantum computation in decoherence-free subspaces (DFSs) via adiabatic passage. The logical single-qubit is encoded in two atoms trapped in a single-mode cavity and the cavities are connected by an optical fiber. Our scheme is immune from the decoherence due to dephasing in virtue of encoding scheme and the decoherence due to spontaneous emission from excited states as the system in our scheme evolves along a dark state. Furthermore, the decoherence due to photon decay is greatly suppressed since the fiber mode remains in a vacuum state and the populations of the cavities' modes being excited can be negligible under certain condition. It is shown that the minimum fidelity of the resultant gate operation for an arbitrary input state could be over 0.97.

• 出版日期2009-8-1
• 单位中国人民解放军国防科学技术大学