Makihara Takuma, Lee Nathan, Guo Yudan, Guan Wenyan, Safavi-Naeini Amir
Department of Applied Physics, Stanford University, Stanford, California, USA.
Nat Commun. 2024 May 31;15(1):4640. doi: 10.1038/s41467-024-48975-x.
Delay lines that store quantum information are crucial for advancing quantum repeaters and hardware efficient quantum computers. Traditionally, they are realized as extended systems that support wave propagation but provide limited control over the propagating fields. Here, we introduce a parametrically addressed delay line for microwave photons that provides a high level of control over the stored pulses. By parametrically driving a three-wave mixing circuit element that is weakly hybridized with an ensemble of resonators, we engineer a spectral response that simulates that of a physical delay line, while providing fast control over the delay line's properties. We demonstrate this novel degree of control by choosing which photon echo to emit, translating pulses in time, and even swapping two pulses, all with pulse energies on the order of a single photon. We also measure the noise added from our parametric interactions and find it is much less than one photon.
存储量子信息的延迟线对于推进量子中继器和硬件高效量子计算机至关重要。传统上，它们被实现为支持波传播的扩展系统，但对传播场的控制有限。在这里，我们引入了一种用于微波光子的参数寻址延迟线，它对存储的脉冲提供了高度的控制。通过对与一组谐振器弱混合的三波混频电路元件进行参数驱动，我们设计了一种光谱响应，该响应模拟了物理延迟线的光谱响应，同时对延迟线的特性提供了快速控制。我们通过选择发射哪个光子回波、及时平移脉冲、甚至交换两个脉冲来展示这种新颖的控制程度，所有这些操作的脉冲能量都在单个光子的量级。我们还测量了参数相互作用添加的噪声，发现其远小于一个光子。
