Comment on "Non-monotonicity in the Quantum-Classical Transition: Chaos Induced by Quantum Effects"

Details Comment on "Non-monotonicity in the Quantum-Classical Transition: Chaos Induced by Quantum Effects" Comment on "Non-monotonicity in the Quantum-Classical Transition: Chaos Induced by Quantum Effects"

2009-03-19

arxiv.org/abs/0903.3417v1

PRL 102, 119401 (2009)

Physics

Quantum Physics

1 page, revtex 4, 1 eps figure

Scientific paper

10.1103/PhysRevLett.102.119401

In a recent Letter [PRL 101, 074101 (2008)], Kapulkin and Pattanayak presented evidence that a quantum Duffing oscillator, sufficiently damped so that it is not classically chaotic, becomes chaotic in the transition region between quantum and classical motion. If true, this would be a striking result. However, Kapulkin and Pattanayak did not calculate the Lyapunov exponent for the system, usually regarded as the litmus-test of chaos. Here we perform this calculation, which throws considerable doubt upon their conclusions.

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