Thermal noise-immunized quantum state transfer through a microwave waveguide
Phys. Rev. A 113, 042437 – Published 15 April, 2026
DOI: https://doi.org/10.1103/7gr4-nk6m
Abstract
High-fidelity quantum state transfer over lossy and thermally populated channels is a major challenge for quantum information processing in quantum networks. Here, we propose a dark-mode-based protocol for high-fidelity quantum state transfer between two distant microwave cavities coupled via a thermal waveguide. By dynamically shaping the microwave cavity-waveguide couplings, the transmission path of quantum information is confined to a decoherence-free subspace, enabling robust transfer even in the presence of thermal photons and waveguide loss. The core mechanism of the protocol is that the dynamical modulation induces an additional effective dissipation channel, which destructively interferes with the waveguide-mediated coupling, thereby realizing genuine dark-mode immunity. Numerical simulations confirm the protocol's robustness and identify key parameters governing fidelity. We also discuss the feasibility of noise-immune quantum communication over experimentally relevant distances. Our work provides a pathway for long-distance quantum network construction and practical applications of future quantum computing systems.
