Hybrid shield for microwave single-photon counter based on a fluxqubit

A scenario of shielding and stabilization of magnetic and electromagnetic fields in themeasuring volume occupied by a superconducting flux qubit is considered. The qubit is usedas an artificial macroscopic atom with discrete energy levels in a counter of singlephotons of the microwave range. It is s...

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Bibliographic Details
Published in:Low temperature physics (Woodbury, N.Y.) N.Y.), 2022-03, Vol.48 (3)
Main Authors: Yu, Lyakhno V, Turutanov, O G, Boichenko, A P
Format: Article
Language:English
Subjects:
Diameters
Electromagnetic fields
Electromagnetic shielding
Energy levels
Ferromagnetism
Magnetic fields
Magnetic flux
Magnetic shielding
Magnetism
Photon counters
Photons
Stability
Superconductivity
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Summary:A scenario of shielding and stabilization of magnetic and electromagnetic fields in themeasuring volume occupied by a superconducting flux qubit is considered. The qubit is usedas an artificial macroscopic atom with discrete energy levels in a counter of singlephotons of the microwave range. It is shown that a decrease in the amplitude of variationsof the external magnetic field inside the 3-layer hybrid cylindrical shield, composed ofsuperconducting and ferromagnetic cylinders with the diameter-to-length ratio of 1:5,provides high stability of the magnetic field. The absolute value of the magnetic field atthe sample location is determined mainly by the magnetic flux captured by thesuperconductor shields during their superconducting transition. Although the magneticfield stability is more important than the field itself for the photon counter, the paperalso discusses experimental methods for reducing the absolute field value in the hybridshield.
ISSN:1063-777X
1090-6517