Flux locking a superfluid interferometer
Yuki Sato, Aditya Joshi, Richard Packard
TL;DR
This paper introduces a flux locking method for a superfluid helium-4 interferometer using heat current injection to achieve linear response to rotation flux, enhancing measurement precision.
Contribution
It presents a novel flux locking technique employing heat current feedback to linearize superfluid interferometer output.
Findings
Achieved linear response to rotation flux
Demonstrated effective flux locking with heat current feedback
Enhanced interferometer measurement stability
Abstract
We demonstrate a flux locking technique using injected heat current to linearize the output of a superfluid helium-4 interferometer. A rotation flux through the interferometer loop produces a shift in the phase of the superfluid order parameter. This shift is nullified via negative feedback by a phase-shift caused by the injected heat current. The feedback signal is then a linear function of rotation flux.
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