Dispersive readout of a flux qubit at the single photon level

J. E. Johnson; E. M. Hoskinson; C. Macklin; D. H. Slichter; I. Siddiqi; John Clarke

doi:10.1103/PhysRevB.84.220503

Dispersive readout of a flux qubit at the single photon level

Superconductivity 2012-03-07 v2 Mesoscale and Nanoscale Physics

Authors: J. E. Johnson , E. M. Hoskinson , C. Macklin , D. H. Slichter , I. Siddiqi , John Clarke

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Abstract

A superconducting flux qubit is inductively coupled to a Superconducting QUantum Interference Device (SQUID) magnetometer, capacitively shunted to form a 1.294-GHz resonator. The qubit-state-dependent resonator frequency is weakly probed with a microwave signal and detected with a Microstrip SQUID Amplifier. At a mean resonator occupation $\bar{n}$ = 1.5 photons, the readout visibility is increased by a factor of 4.5 over that using a cryogenic semiconductor amplifier. As $\bar{n}$ is increased from 0.008 to 0.1, no reduction in $T_1$ is observed, potentially enabling continuous monitoring of the qubit state.

Keywords

flux qubit dispersive readout SQUID amplifier superconducting resonator single photon quantum measurement

Cite

@article{arxiv.1109.2858,
  title  = {Dispersive readout of a flux qubit at the single photon level},
  author = {J. E. Johnson and E. M. Hoskinson and C. Macklin and D. H. Slichter and I. Siddiqi and John Clarke},
  journal= {arXiv preprint arXiv:1109.2858},
  year   = {2012}
}

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5 pages, 5 figures

Dispersive readout of a flux qubit at the single photon level

Abstract

Keywords

Cite

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