Exploring noiseless subsystems via nuclear magnetic resonance

被引:31
作者
Fortunato, EM
Viola, L
Pravia, MA
Knill, E
Laflamme, R
Havel, TF
Cory, DG
机构
[1] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[2] MIT, Dept Nucl Engn, Cambridge, MA 02139 USA
[3] Univ Waterloo, Dept Phys, Waterloo, ON N2L 3G1, Canada
[4] Perimeter Inst Theoret Phys, Waterloo, ON N2J 2W9, Canada
关键词
D O I
10.1103/PhysRevA.67.062303
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Noiseless subsystems offer a general and efficient method for protecting quantum information in the presence of noise that has symmetry properties. A paradigmatic class of error models displaying nontrivial symmetries emerges under collective noise behavior, which implies a permutationally invariant interaction between the system and the environment. We expand our previous investigation of the noiseless subsystem idea [L. Viola , Science 293, 2059 (2001)] by reporting and analyzing NMR experiments that demonstrate the preservation of a qubit encoded in a three-qubit noiseless subsystem for general collective noise. A complete set of input states is used to determine the superoperator for the implemented one-qubit process and to confirm that the fidelity of entanglement is improved for a large, noncommutative set of engineered errors. To date, this is the largest set of error operators that has been successfully corrected for by any quantum code.
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页数:16
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