Qubit State Measurement using the Josephson Photomultiplier
ORAL
Abstract
We describe results of high-fidelity qubit state measurement based on microwave photon counting. The protocol involves mapping the qubit state onto high-contrast microwave cavity pointer states in a linear readout resonator followed by subsequent photodetection using the Josephson Photomultiplier (JPM). Our technique provides access to the classical binary outcome of qubit state measurement at the millikelvin stage of a dilution refrigerator and does not use any non-reciprocal components between the qubit and JPM. We exploit the intrinsic damping of the JPM to “clean up” following photodetection so that the measurement is highly QND. This approach is well-suited for integration with proximal cryogenic digital logic.
*This work was supported by the U.S. Government under Grant W911NF-15-1-0248.
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Presenters
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Alexander Opremcak
- Univ of Wisconsin, Madison
- Physics, University of Wisconsin Madison
- University of Wisconsin-Madison