通过主动冷却有限温度腔实现二能级系统之间的忠实态转移
Faithful state transfer between two-level systems via an actively cooled finite-temperature cavity
摘要：
我们考虑了有限温度下两个量子比特--由里德伯原子表示的有效二能级系统--通过微波腔的共模的状态转移。我们发现，当两个量子位具有相同的耦合强度的腔场，在足够大的失谐从腔模式的频率，跃迁路径之间的量子干涉使得量子位之间的激发的交换在很大程度上不敏感的热光子在腔中的数量。然而，当耦合强度不同时，跃迁频率的光子数依赖的差分斯塔克位移排除了有效的转移。尽管如此，使用辅助冷却系统来连续提取腔光子，我们仍然可以实现量子比特之间的高保真状态转移。
英文摘要：
We consider state transfer between two qubits - effective two-level systems represented by Rydberg atoms - via a common mode of a microwave cavity at finite temperature. We find that when both qubits have the same coupling strength to the cavity field, at large enough detuning from the cavity mode frequency, quantum interference between the transition paths makes the swap of the excitation between the qubits largely insensitive to the number of thermal photons in the cavity. When, however, the coupling strengths are different, the photon number-dependent differential Stark shift of the transition frequencies precludes efficient transfer. Nevertheless, using an auxiliary cooling system to continuously extract the cavity photons, we can still achieve a high-fidelity state transfer between the qubits.
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