Volume 77, Number 5, March 2007
|Number of page(s)||4|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||22 February 2007|
Flux qubit as a sensor of magnetic flux
Institute for Physical High Technology - P.O. Box 100239, D-07702 Jena, Germany
2 Novosibirsk State Technical University - 20 K. Marx Ave., 630092 Novosibirsk, Russia
Corresponding author: email@example.com
Accepted: 17 January 2007
A magnetometer based on the quantum properties of a superconducting flux qubit is proposed. The main advantage of this device is that its sensitivity can be below the so-called “standard quantum limit” (for an oscillator this is half of the Plank constant). Moreover its transfer functions relative to the measured flux can be made to be about , which is an order of magnitude more than the best value for a conventional DC SQUIDs with a direct readout. 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.
PACS: 85.25.Cp – Josephson devices / 85.25.Dq – Superconducting quantum interference devices (SQUIDs) / 84.37.+q – Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)
© Europhysics Letters Association, 2007
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