Quantum and classical chirps in an anharmonic oscillator

Yoni Shalibo*, Ya'Ara Rofe, Ido Barth, Lazar Friedland, Radoslaw Bialczack, John M. Martinis, Nadav Katz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


We measure the state dynamics of a tunable anharmonic quantum system, the Josephson phase circuit, under the excitation of a frequency-chirped drive. At small anharmonicity, the state evolves like a wave packet-a characteristic response in classical oscillators; in this regime, we report exponentially enhanced lifetimes of highly excited states, held by the drive. At large anharmonicity, we observe sharp steps, corresponding to the excitation of discrete energy levels. The continuous transition between the two regimes is mapped by measuring the threshold of these two effects.

Original languageAmerican English
Article number037701
JournalPhysical Review Letters
Issue number3
StatePublished - 19 Jan 2012


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