Phase-locking transition in a chirped superconducting Josephson resonator

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dc.creatorNaaman, O.
dc.creatorAumentado, J.
dc.creatorFriedland, L.
dc.creatorWurtele, J. S.
dc.creatorSiddiqi, I.
dc.date2008-05-14
dc.date2008-05-16
dc.date.accessioned2026-07-07T10:02:08Z
dc.date.available2026-07-07T10:02:08Z
dc.descriptionBy coupling a harmonic oscillator to a quantum system it is possible to perform a dispersive measurement that is quantum non-demolition (QND), with minimal backaction. A non-linear oscillator has the advantage of measurement gain, but what is the backaction? Experiments on superconducting quantum bits (qubits) coupled to a non-linear Josephson oscillator have thus far utilized the switching of the oscillator near a dynamical bifurcation for sensitivity, and have demonstrated partial QND measurement. The detailed backaction associated with the switching process is complex, and may ultimately limit the degree to which such a measurement can be QND. Here we demonstrate a new dynamical effect in Josephson oscillators by which the bifurcation can be accessed without switching. When energized with a frequency chirped drive with an amplitude close to a sharp, phase-locking threshold, the oscillator evolves smoothly in one of two diverging trajectories - a pointer for the state of a qubit. The observed critical behavior agrees well with theory and suggests a new modality for quantum state measurement.
dc.description5 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0805.1959
dc.identifierhttp://arxiv.org/abs/0805.1959
dc.identifierPhys. Rev. Lett. 101, 117005 (2008)
dc.identifierdoi:10.1103/PhysRevLett.101.117005
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/168866
dc.subjectMesoscale and Nanoscale Physics
dc.subjectSuperconductivity
dc.titlePhase-locking transition in a chirped superconducting Josephson resonator
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