通过腔QED实现高效的两原子的受控位相门

Realization of two-atom quantum controlled phase gate with high efficiency via cavity QED

量子计算是近年来新出现的计算技术,具有非常好的发展前景。任何量子计算都能够被简化到一个门序列,而量子计算要利用某种物理体系来实现。介绍了一种通过腔QED实现高效的两原子的受控位相门的方案。此方案中,原子跃迁与腔模处于大失谐,因此原子自发辐射的影响得到了极大的抑制,从而提高了成功几率。而保真度取决于α、β、γ、δ几个常数的取值,数值计算结果表明我们的方案具有比较高的保真度,其保真度的平均值F=0．982318。该方案有一定的实验可行性,有望得到实验上的验证。

Any quantum computation can be simplified to a gate sequence. But the quantum computation is carried out by a certain physical system. We propose here a scheme to carry out two-atom quantum controlled phase gate through cavity QED. In our scheme, the atomic transition is largely detuned with the cavity mode of interest, so the atomic spontaneous emission loss is strongly suppressed, and this leads to the enhancement of probability of gate operation. But fidelity is decided by constants α,β,γ. The numerical calculation based on current experimental technology shows that our scheme has high gate fidelity, the average value of fidelity ^-F = 0.982318. That scheme can be realized by experiment.