Experimental Realization of Noiseless Subsystems for Quantum Information Processing
Lorenza Viola,1*
Evan M. Fortunato,2*
Marco A. Pravia,2
Emanuel Knill,1
Raymond Laflamme,1
David G. Cory2
We demonstrate the protection of one bit of quantum
information against all collective noise in three nuclear spins.
Because no subspace of states offers this protection, the quantum bit was encoded in a proper noiseless subsystem. We therefore realize a
general and efficient method for protecting quantum information. Robustness was verified for a full set of noise operators that do not
distinguish the spins. Verification relied on the most complete
exploration of engineered decoherence to date. The achieved fidelities
show improved information storage for a large, noncommutative set of
errors.
1 Los Alamos National Laboratory, Los Alamos,
NM 87545, USA.
2 Department of Nuclear Engineering,
Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
1 Los Alamos National Laboratory, Los Alamos,
NM 87545, USA.
2 Department of Nuclear Engineering,
Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
*
These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail:
lviola{at}lanl.gov
