热涨落对实现可靠量子计算的影响

采用格林函数的方法,讨论了环境温度的涨落对冷槽离子量子计算机实现可靠量子计算的影响.结果表明,存在一个临界温度,低于这个温度,离子基态和质心声子受环境的影响很弱,由于热效应引起的退相干在这个范围可以不予考虑.高于这个温度,热效应所导致的离子基态的偏离量迅速上升,质心声子增加,在没有有力的纠错办法保证下,它将导致量子计算出错.

The Effect of the Thermal Fluctuation on the Realization of the Reliable Quantum Computation

We discussed the influence of the fluctuation of the environmental temperature on the reliable quantum computation executed by the cold trapped ion quantum computer. The results showed that a critical temperature exists. The decoherence induced by the thermal fluctuation could be ignored below the critical temperature because the environment had almost no effect on the ground states of the ions and the center-of-mass phonon. But the effect could not be ignored when the temperature exceeded the critical valu...