We incorporate active and passive quantum error-correcting techniques to protect a set of optical information modes of a continuous-variable quantum information system. Our method uses ancilla modes, entangled modes, and gauge modes (modes in a mixed state) to help correct errors on a set of information modes. A linear-optical encoding circuit consisting of offline squeezers, passive optical devices, feedforward control, conditional modulation, and homodyne measurements performs the encoding. The result is that we extend the entanglement-assisted operator stabilizer formalism for discrete variables to continuous-variable quantum information processing. © 2009 Springer Science+Business Media, LLC.
Publication Source (Journal or Book title)
Quantum Information Processing
Wilde, M., & Brun, T. (2009). Protecting quantum information with entanglement and noisy optical modes. Quantum Information Processing, 8 (5), 401-413. https://doi.org/10.1007/s11128-009-0117-x