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Circular-Motion Fulling-Davies-Unruh Effect in Coupled Annular Josephson Junctions.
Haruna Katayama1,2, Noriyuki Hatakenaka1
1Hiroshima University, Graduate School of Advanced Science and Engineering, Higashihiroshima, 739-8521, Japan.
Physical Review Letters
|August 12, 2025
Summary
Researchers propose a novel detector for observing the Fulling-Davies-Unruh effect using circular motion. This method could reveal quantum vacuum properties with current technology.
Area of Science:
- Quantum physics
- Condensed matter physics
Background:
- The Fulling-Davies-Unruh effect predicts that an accelerating observer perceives a thermal bath.
- Experimental verification of this effect is challenging due to the required high accelerations.
Purpose of the Study:
- To propose an experimentally feasible method for observing the Fulling-Davies-Unruh effect.
- To introduce a novel detector sensitive to quantum vacuum properties.
Main Methods:
- Utilizing coupled annular Josephson junctions with metastable fluxon-antifluxon pairs as a detector.
- Inducing high accelerations through uniform circular motion of detector pairs at relativistic velocities and small radii.
Main Results:
- Numerical simulations confirm an acceleration-dependent temperature.
- An effective Unruh temperature of approximately 1 K is predicted to be observable.
Conclusions:
- The proposed method offers a promising avenue for experimental probing of the quantum vacuum.
- The novel detector demonstrates high sensitivity for temperature measurements, supporting the Fulling-Davies-Unruh effect.
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