Flux qubit as a sensor for a magnetometer with quantum limited sensitivity

Abstract

We propose to use the quantum properties of a superconducting flux qubit in the construction of a magnetometer with quantum limited sensitivity. The main advantage of a flux qubit is that its noise is rather low, and its transfer functions relative to the measured flux can be made to be about 10mV/${\Phi }_0$, which is an order of magnitude more than the best value for a conventional SQUID magnetometer. We analyze here the voltage-to-flux, the phase-to-flux transfer functions and the main noise sources. We show that the experimental characteristics of a flux qubit, obtained in recent experiments, allow the use of a flux qubit as magnetometer with energy resolution close to the Planck constant.

3 pages, 6 figures

References in corpus (1)

• Low-frequency measurement of the tunneling amplitude in a flux qubit

Cited by in corpus (1)

• Impedance measurement technique for quantum systems