Deterministic generation of frequency-bin-encoded microwave photons

Scalable quantum computing requires reliable communication between distant processors. Propagating microwave photons offer a solution, but photon loss limits transfer fidelity. We demonstrate frequency-bin encoded microwave photons by encoding a qubit state into two distinct frequency modes with high fidelity. This enables photon loss detection via heralding and supports error-detectable links. Our simple, hardware-efficient architecture is a versatile building block for superconducting and waveguide-based quantum networks.