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Updated: May 5, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Gaussian error correction of quantum states in a correlated noisy channel
Mikael Lassen1, Adriano Berni, Lars S Madsen
1Department of Physics, Technical University of Denmark, Fysikvej, 2800 Kongens Lyngby, Denmark.
Abstract:
Noise is the main obstacle for the realization of fault-tolerant quantum information processing and secure communication over long distances. In this work, we propose a communication protocol relying on simple linear optics that optimally protects quantum states from non-Markovian or correlated noise. We implement the protocol experimentally and demonstrate the near-ideal protection of coherent and entangled states in an extremely noisy channel. Since all real-life channels are exhibiting pronounced non-Markovian behavior, the proposed protocol will have immediate implications in improving the performance of various quantum information protocols.
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