Letter abstract
Nature Physics 5, 541 - 546 (2009)
Published online: 28 June 2009 | doi:10.1038/nphys1309
Subject Categories: Quantum physics | Optical physics
Quantum error correction beyond qubits
Takao Aoki1,5, Go Takahashi1,2, Tadashi Kajiya1,2, Jun-ichi Yoshikawa1,2, Samuel L. Braunstein3, Peter van Loock4 & Akira Furusawa1,2
Quantum computation and communication rely on the ability to manipulate quantum states robustly and with high fidelity. To protect fragile quantum-superposition states from corruption through so-called decoherence noise, some form of error correction is needed. Therefore, the discovery of quantum error correction1, 2 (QEC) was a key step to turn the field of quantum information from an academic curiosity into a developing technology. Here, we present an experimental implementation of a QEC code for quantum information encoded in continuous variables, based on entanglement among nine optical beams3. This nine-wave-packet adaptation of Shor's original nine-qubit scheme1 enables, at least in principle, full quantum error correction against an arbitrary single-beam error.
- Department of Applied Physics and Quantum Phase Electronics Center, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
- CREST, Japan Science and Technology (JST) Agency, 5, Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
- Computer Science, University of York, York YO10 5DD, UK
- Optical Quantum Information Theory Group, Max Planck Institute for the Science of Light and Institute of Theoretical Physics I, Universität Erlangen-Nürnberg, Staudtstr.7/B2, 91058 Erlangen, Germany
- Current address: Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
Correspondence to: Akira Furusawa1,2 e-mail: akiraf@ap.t.u-tokyo.ac.jp
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