Description
Closely related but contrary to Qubits, dark matter detectors are built to be ultra-sensitive to phonons created from impacts in the substrate. TESs have been successfully implemented as phonon sensors on gram-scale detectors. Kinetic inductance devices (KIDs) are naturally suitable for multiplexing readout, which can scale detectors to kilogram scale.
At LBL we focus on low Tc Hafnium KIDs R&D for phonon sensing. 250mK Tc resonators with internal quality factors exceeding 10^5 have been demonstrated. Low Tc not only yields more quasiparticles per unit energy, but also enables quasiparticle trapping from aluminum phonon absorbers. This technique will lead to sub-eV energy threshold kilogram scale dark matter detectors.
Primary authors
Aritoki Suzuki
(Lawrence Berkeley National Laboratory)
Xinran Li
(Lawrence Berkeley national laboratory)
Maurice Garcia-Sciveres
(LBNL)