Microwave nanobolometer based on proximity Josephson junctions
arXiv:1403.6586 · doi:10.1103/PhysRevB.90.064505
Abstract
We introduce a microwave bolometer aimed at high-quantum-efficiency detection of wave packet energy within the framework of circuit quantum electrodynamics, the ultimate goal being single microwave photon detection. We measure the differential thermal conductance between the detector and its heat bath, obtaining values as low as 5 fW/K at 50 mK. This is one tenth of the thermal conductance quantum and corresponds to a theoretical lower bound on noise-equivalent-power of order $W/\sqrt{\mbox{Hz}}$ at 50 mK. By measuring the differential thermal conductance of the same bolometer design in qualitatively different environments and materials, we determine that electron--photon coupling dominates the thermalization of our nanobolometer.
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- Superconductivity provides a giant enhancement to the spin battery effect
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- Microwave Admittance of Gold-Palladium Nanowires with Proximity-Induced Superconductivity
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- Parity measurement of remote qubits using dispersive coupling and photodetection
- Modification of electron-phonon coupling by micromachining and suspension
- Energy fluctuations of finite free-electron Fermi gas
- Correlation measurement of propagating microwave photons at millikelvin
- Dissipation and noise in strongly driven Josephson junctions