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Superconducting Qubits

Dispersive readout scheme for a Josephson phase qubit

arXiv
Authors: T. Wirth, J. Lisenfeld, A. Lukashenko, A. V. Ustinov

Year

2010

Paper ID

10992

Status

Preprint

Abstract Read

~2 min

Abstract Words

108

Citations

N/A

Abstract

We present experimental results on a dispersive scheme for reading out a Josephson phase qubit. A capacitively shunted dc-SQUID is used as a nonlinear resonator which is inductively coupled to the qubit. We detect the flux state of the qubit by measuring the amplitude and phase of a microwave pulse reflected from the SQUID resonator. By this low-dissipative method, we reduce the qubit state measurement time down to 25 microseconds, which is much faster than using the conventional readout performed by switching the SQUID to its non-zero dc voltage state. The demonstrated readout scheme allows for reading out multiple qubits using a single microwave line by employing frequency-division multiplexing.

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  • This paper contributes to the Superconducting Qubits research area in the Quantum Articles archive.
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  • We present experimental results on a dispersive scheme for reading out a Josephson phase qubit.

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References & Citation Signals

[1] DOI https://doi.org/arXiv:1010.0954 [2] arXiv https://arxiv.org/abs/1010.0954 [3] Publisher https://arxiv.org/abs/1010.0954

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