Speaker
Description
The rapid advancement of quantum electronics and microwave photonics is driven by the native operation of superconducting qubits, spin qubits, and hybrid solid-state quantum devices in the microwave regime. This makes microwave photonics a powerful platform for their precise control and manipulation, while superconducting-circuit-based quantum microwave photonics opens new avenues for engineering photonic states.
We introduce and experimentally demonstrate a Doppler-induced frequency conversion technique for microwave pulses at cryogenic temperatures. The method is intrinsically free from intermodulation and pulse-shape distortions, while offering high tunability. It relies on the spatiotemporal modulation of an effective refractive medium, enabling efficient and controllable frequency translation.
The implementation is based on a superconducting high-kinetic-inductance transmission line, where a microwave pulse counter-propagates with a control current front [1]. In this travelling-wave configuration, we achieve frequency shifts of microwave wave packets at 500 MHz and 4 GHz of up to 3.7%, with full preservation of their temporal profiles.
[1] https://arxiv.org/abs/2603.12436