论文标题
冷却光子压力电路进入量子状态
Cooling photon-pressure circuits into the quantum regime
论文作者
论文摘要
电磁场的量子控制最初是在光学结构域中建立的，并且在过去几十年中已将量子光子学扩展到更广泛的频率状态，已在Gigahertz范围内提高到较低的频率。然而，在标准的低温系统中，热脱谐度阻止了在Gigahertz域以下的光子频率的量子状态。在这里，我们设计了两个由光子压力相互作用的超导LC电路，并使用微波腔展示了热射频（RF）电路的侧带冷却。由于耦合强度大大提高，我们获得了一个大型的单光子量子合作，$ \ MATHCAL {C} _ {\ MATHRM {Q} 0} 0} \ SIM 1 $，并将热RF占用率降低75％，而泵光子少于一个泵光子。对于较大的泵功率，耦合速率超过了RF热谐波速率3倍，RF电路被冷却到量子基态。我们的结果为RF量子光子学奠定了基础。
Quantum control of electromagnetic fields was initially established in the optical domain and has been advanced to lower frequencies in the gigahertz range during the past decades extending quantum photonics to broader frequency regimes. In standard cryogenic systems, however, thermal decoherence prevents access to the quantum regime for photon frequencies below the gigahertz domain. Here, we engineer two superconducting LC circuits coupled by a photon-pressure interaction and demonstrate sideband cooling of a hot radio frequency (RF) circuit using a microwave cavity. Because of a substantially increased coupling strength, we obtain a large single-photon quantum cooperativity $\mathcal{C}_{\mathrm{q}0} \sim 1$ and reduce the thermal RF occupancy by 75% with less than one pump photon. For larger pump powers, the coupling rate exceeds the RF thermal decoherence rate by a factor of 3, and the RF circuit is cooled into the quantum ground state. Our results lay the foundation for RF quantum photonics.
