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

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Sabuncu,  Metin
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Leuchs,  Gerd
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Andersen,  Ulrik L.
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Lassen, M., Sabuncu, M., Huck, A., Niset, J., Leuchs, G., Cerf, N. J., et al. (2010). Quantum optical coherence can survive photon losses using a continuous-variable quantum erasure-correcting code. NATURE PHOTONICS, 4(10), 700-705. doi:10.1038/NPHOTON.2010.168.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-6AA7-E
Abstract
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 environment(1-10). 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.