Institute of Science and Technology Austria, Am Campus 1, 3400, Klosterneuburg, Austria.
Nat Commun. 2023 Jun 24;14(1):3784. doi: 10.1038/s41467-023-39493-3.
Recent quantum technologies have established precise quantum control of various microscopic systems using electromagnetic waves. Interfaces based on cryogenic cavity electro-optic systems are particularly promising, due to the direct interaction between microwave and optical fields in the quantum regime. Quantum optical control of superconducting microwave circuits has been precluded so far due to the weak electro-optical coupling as well as quasi-particles induced by the pump laser. Here we report the coherent control of a superconducting microwave cavity using laser pulses in a multimode electro-optical device at millikelvin temperature with near-unity cooperativity. Both the stationary and instantaneous responses of the microwave and optical modes comply with the coherent electro-optical interaction, and reveal only minuscule amount of excess back-action with an unanticipated time delay. Our demonstration enables wide ranges of applications beyond quantum transductions, from squeezing and quantum non-demolition measurements of microwave fields, to entanglement generation and hybrid quantum networks.
最近的量子技术已经使用电磁波实现了对各种微观系统的精确量子控制。基于低温腔电光系统的界面由于在量子态下微波和光场之间的直接相互作用而特别有前途。由于泵浦激光引起的弱电光耦合和准粒子，超导微波电路的量子光学控制迄今为止一直受到阻碍。在这里，我们报告了在毫开尔文温度下使用多模电光器件中的激光脉冲对超导微波腔进行的相干控制，其协同率接近 1。微波和光学模式的静态和瞬时响应都符合相干电光相互作用，并且仅显示出极小的过量反作用，并且具有出乎意料的时间延迟。我们的演示实现了超越量子转换的广泛应用，从微波场的压缩和量子非破坏测量，到纠缠生成和混合量子网络。
