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Quantum optical coherence can survive photon losses using a continuous-variable quantum erasure-correcting code

par Lassen, Mikael;Sabuncu, M.;Huck, Alexander;Niset, Julien ;Leuchs, Gerd;Cerf, Nicolas ;Anderson, Ulrik L.
Référence Nature Photonics, 4, page (700-705)
Publication Publié, 2010

Article révisé par les pairs

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Résumé :

A fundamental requirement for enabling fault-tolerant quantum information processing is an efficient quantum error-correcting code that robustly protects the involved fragile quantum states from their environment1-10. Just as classical error-correcting codes are indispensible in today's information technologies, it is believed that quantum error-correcting code will play a similarly crucial role in tomorrow's quantum information systems. Here, we report on the experimental demonstration of a quantum erasure-correcting code that overcomes the devastating effect of photon losses. Our quantum code is based on linear optics, and it protects a four-mode entangled mesoscopic state of light against erasures. We investigate two approaches for circumventing in-line losses, and demonstrate that both approaches exhibit transmission fidelities beyond what is possible by classical means. Because in-line attenuation is generally the strongest limitation to quantum communication, such an erasure-correcting code provides a new tool for establishing quantum optical coherence over longer distances. © 2010 Macmillan Publishers Limited. All rights reserved.