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Dispersive Readout of a Flux Qubit at the Single Photon Level by Johnson, J. E.; Hoskinson, E. M.; Macklin, C.; Slichter, D. H.; Siddiqi, I.; Clarke, John is a scholarly article available to read on EtoBox.

What is Dispersive Readout of a Flux Qubit at the Single Photon Level about?

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.

Author

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

Published

2011

Language

EN