Phys. Rev. Lett. 94, 130501 (2005) [4 pages]Experimental Implementation of a Concatenated Quantum Error-Correcting CodeReceived 27 September 2004; published 8 April 2005 Concatenated coding provides a general strategy to achieve the desired level of noise protection in quantum information processing. We report the implementation of a concatenated quantum error-correcting code able to correct phase errors with a strong correlated component. The experiment was performed using liquid-state nuclear magnetic resonance techniques on a four spin subsystem of labeled crotonic acid. Our results show that concatenation between active and passive quantum error correction is a practical tool to handle realistic noise involving both independent and correlated errors. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.130501
DOI:
10.1103/PhysRevLett.94.130501
PACS:
03.67.Pp, 03.65.Yz, 76.60.–k
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