title: Effects of symmetries on quantum fidelity decay.
abstract: We explore the effect of a system's symmetries on fidelity decay behavior. Chaoslike exponential fidelity decay behavior occurs in nonchaotic systems when the system possesses symmetries and the applied perturbation is not tied to a classical parameter. Similar systems without symmetries exhibit faster-than-exponential decay under the same type of perturbation. This counterintuitive result, that extra symmetries cause the system to behave in a chaotic fashion, may have important ramifications for quantum-error correction.
authors.affiliation: Center for Computational Materials Science, Naval Research Laboratory, Washington, DC 20375, USA. weinstei@dave.nrl.army.mil
authors.forename: Yaakov S
authors.initials: YS
authors.lastname: Weinstein
authors.forename: C Stephen
authors.initials: CS
authors.lastname: Hellberg