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

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

2006-08-18

arxiv.org/abs/cond-mat/0608416v1

Europhysics Letters 77, 58005 (2007)

Physics

Condensed Matter

Superconductivity

3 pages, 6 figures

Scientific paper

10.1209/0295-5075/77/58005

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.

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