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Updated: Aug 15, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout
K B Cooper1, Matthias Steffen, R McDermott
1National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA.
Abstract:
We have detected coherent quantum oscillations between Josephson phase qubits and critical-current fluctuators by implementing a new state readout technique that is an order of magnitude faster than previous methods. These results reveal a new aspect of the quantum behavior of Josephson junctions, and they demonstrate the means to measure two-qubit interactions in the time domain. The junction-fluctuator interaction also points to a possible mechanism for decoherence and reduced fidelity in superconducting qubits.
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