Synthetic Photons and Giant-Atom Lattices: High-Fidelity Transduction for Near-Term Quantum Networks

This paper provides a technical framework for improving quantum network fidelity using synthetic frequency dimensions. We detail a method for chiral, directional transduction that enables room-temperature qudit encoding and autonomous noise correction, specifically optimized for near-term QKD applications. It serves as a companion to "From Primordial Atoms to New Synthetic Matter Qubits" by offering controllable synthetic photons for cleaner matter-photon interfacing in current quantum hardware.