Interfering pathways for photon blockade in cavity QED with one and two qubits
Interfering pathways for photon blockade in cavity QED with one and two qubits
复制标题
具有一个和两个量子位的腔 QED 中光子阻塞的干扰路径
DOI：
10.1103/physreva.100.063817
复制
发表时间：
2019-12-10
影响因子：
2.9
通讯作者：
Agarwal, G. S.
中科院分区：
文献类型：
--
作者：
Hou, K.;Zhu, C. J.;Agarwal, G. S.
从理论上研究了原子腔QED系统中两条不同跃迁路径之间的相消干涉抑制了双光子激发的量子干涉诱导的光子阻塞现象。在这里，我们首先研究了单原子腔QED系统通过原子或腔驱动。结果表明，在一定条件下，腔驱动的情况会导致量子干涉诱导的光子阻塞，而原子驱动的情况不会导致这种干涉诱导的光子阻塞。然后，我们研究了双原子情况，发现在原子驱动的情况下出现了额外的跃迁路径。我们发现，只有当原子的共振频率不同于腔模频率时，这条额外的跃迁路径才会导致量子干涉引起的光子阻塞。此外，在这种情况下，实现干涉诱导光子阻塞的条件与系统的内禀参数无关，这一条件可用于产生弱耦合和强耦合的反聚束光子源。
We theoretically study the quantum interference induced photon blockade phenomenon in atom cavity QED system, where the destructive interference between two different transition pathways prohibits the two-photon excitation. Here, we first explore the single atom cavity QED system via an atom or cavity drive. We show that the cavity-driven case will lead to the quantum interference induced photon blockade under a specific condition, but the atom driven case can't result in such interference induced photon blockade. Then, we investigate the two atoms case, and find that an additional transition pathway appears in the atom-driven case. We show that this additional transition pathway results in the quantum interference induced photon blockade only if the atomic resonant frequency is different from the cavity mode frequency. Moreover, in this case, the condition for realizing the interference induced photon blockade is independent of the system's intrinsic parameters, which can be used to generate antibunched photon source both in weak and strong coupling regimes.