title: Experimental implementation of a concatenated quantum error-correcting code.
abstract: 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.
authors.affiliation: Department of Nuclear Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Boulant
authors.forename: Lorenza
authors.initials: L
authors.lastname: Viola
authors.forename: Evan M
authors.initials: EM
authors.lastname: Fortunato
authors.forename: David G
authors.initials: DG
authors.lastname: Cory