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 (4)

• A Superconducting Persistent Current Qubit
• Decoherence in Josephson-junction qubits due to critical current fluctuations
• Low-frequency measurement of the tunneling amplitude in a flux qubit
• Low-frequency characterization of quantum tunneling in flux qubits

Cited by in corpus (13)

• Nonadiabatic Landau-Zener-Stückelberg-Majorana transitions, dynamics, and interference
• Scanning Quantum Decoherence Microscopy
• Ultrasensitive magnetic field detection using a single artificial atom
• Hybrid superconducting quantum magnetometer
• Electron paramagnetic resonance spectroscopy using a single artificial atom
• Electron paramagnetic resonance spectroscopy using a dc-SQUID magnetometer directly coupled to an electron spin ensemble
• Parametric amplification by coupled flux qubits
• Impedance measurement technique for quantum systems
• Linear Ascending Metrological Algorithm
• Remote sensing of a levitated superconductor with a flux-tunable microwave cavity
• The two Josephson junction flux qubit with large tunneling amplitude
• Amplification of the quantum superposition macroscopicity of a flux qubit by a magnetized Bose gas
• Resonance at the Rabi frequency in a superconducting flux qubit