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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Flux-Tunable Cavity for Dark Matter Detection.

Fang Zhao¹, Ziqian Li^2,3,4, Akash V Dixit^2,3,5

¹Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.

Physical Review Letters

|November 30, 2025

Summary

This summary is machine-generated.

Researchers developed an electronically tunable dark matter detector using superconducting technology. This novel device enables sensitive hidden-photon dark matter searches, constraining the kinetic mixing angle to below 8.2×10⁻¹⁵.

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Area of Science:

Experimental Physics
Particle Physics
Astrophysics

Background:

Developing dark matter detectors with tunable mass is crucial but challenging, especially in sub-Kelvin cryogenic environments.
Traditional mechanical tuning of resonant cavities is difficult in cryogenics due to thermal contraction and low heat capacities.
Existing methods struggle with sensitivity and operational stability in extreme low-temperature conditions.

Purpose of the Study:

To develop an electronically tunable resonant cavity architecture for dark matter detection.
To overcome the limitations of mechanical tuning in sub-Kelvin environments.
To perform a sensitive search for hidden-photon dark matter.

Main Methods:

Coupling a superconducting 3D microwave cavity with a dc flux tunable superconducting quantum interference device (SQUID).
Engineering a flux delivery system to maintain high coherence within the cavity.
Employing microwave photon counting via repeated quantum nondemolition measurements using a transmon qubit.

Main Results:

Achieved an electronically tunable cavity architecture for dark matter detection.
Performed a hidden-photon dark matter search below the quantum-limited threshold.
Constrained the kinetic mixing angle to ϵ<8.2×10⁻¹⁵ in the 5.672–5.694 GHz tunable band.

Conclusions:

Electronically tunable cavities offer a promising alternative to mechanical tuning for dark matter detection.
The developed device demonstrates high sensitivity and stability in cryogenic environments.
Coupling multimode tunable cavities can extend the search range for hidden-photon dark matter.