Quantum key rates improve with squeezed light over fiber

Researchers have demonstrated a continuous-variable quantum key distribution (CV-QKD) system using squeezed states of light and modern digital signal processing techniques. The work experimentally verifies theoretical predictions that squeezed states offer advantages over coherent states, including higher secret key rates and greater resilience to noise. Operating over fiber channels and accounting for realistic security threats, the system suggests a path toward more efficient and secure quantum communication infrastructure. “Our work paves the way for squeezed states to become practical resources for quantum key distribution and other quantum information protocols,” the paper states. Early theoretical works predicted these advantages, and recent demonstrations confirm the potential for practical implementation in quantum communication networks. These improvements are particularly relevant as CV-QKD seeks to integrate smoothly with existing optical infrastructure, a key goal for wider adoption. The benefits extend beyond simple rate increases. Squeezed states also reduce the demands placed on information reconciliation, a step in CV-QKD where raw key data is corrected for errors.…