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RESEARCH PRODUCT
Microwave nanobolometer based on proximity Josephson junctions
Kuan TanIlari MaasiltaRussell E. LakePauli VirtanenJoonas GoveniusJuhani JulinVille PietiläMikko Möttönensubject
PhysicsJosephson effectta214Condensed Matter - Mesoscale and Nanoscale PhysicsCondensed matter physicsta114Bolometerta221FOS: Physical sciencesOrder (ring theory)Condensed Matter PhysicsCoupling (probability)Thermal conductance quantumElectronic Optical and Magnetic Materialslaw.inventionPi Josephson junctionCircuit quantum electrodynamicsbolometerlawMesoscale and Nanoscale Physics (cond-mat.mes-hall)Energy (signal processing)ta218proximity Josephson junctiondescription
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 $5\phantom{\rule{4.pt}{0ex}}\text{fW}/\mathrm{K}$ at $50\phantom{\rule{4.pt}{0ex}}\text{mK}$. This is one tenth of the thermal conductance quantum and corresponds to a theoretical lower bound on noise-equivalent power of order ${10}^{\ensuremath{-}20}\phantom{\rule{4.pt}{0ex}}\text{W}/\sqrt{\text{Hz}}$ at $50\phantom{\rule{4.pt}{0ex}}\text{mK}$. By measuring the differential thermal conductance of the same bolometer design in substantially different environments and materials, we determine that electron-photon coupling dominates the thermalization of our nanobolometer.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2014-01-01 | Physical Review B |