Mesoscopic Shelving Readout of Superconducting Qubits in Circuit QED

Abstract

We present a method for measuring the internal state of a superconducting qubit inside an on-chip microwave resonator. We show that one qubit state can be associated with the generation of an increasingly large cavity coherent field, while the other remains associated with the vacuum. By measuring the outgoing resonator field with conventional devices, an efficient single-shot QND-like qubit readout can be achieved, enabling a high-fidelity measurement in the spirit of the electron-shelving technique for trapped ions. We expect that the proposed ideas can be adapted to different superconducting qubit designs and contribute to the further improvement of qubit readout fidelity.

4 pages, 3 figures

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Cited by in corpus (8)

• Performing SU($d$) operations and rudimentary algorithms in a superconducting transmon qudit for $d=3$ and $d=4$
• Dynamical Autler-Townes control of a phase qubit
• Ultrafast QND measurements based on diamond-shape artificial atom
• Protocol for high fidelity readout in the photon blockade regime of circuit QED
• Bistability effect in the extreme strong coupling regime of the Jaynes-Cummings model
• Optical drive of macroscopic mechanical motion by a single two-level system
• Electron shelving of a superconducting artificial atom
• Quantum dynamics of a driven three-level Josephson-atom maser