Josephson-junction-based bolometer
ORAL
Abstract
We recently introduced a calorimeter capable of detecting packets containing 200 8.4-GHz photons, or 1.1 zJ of energy. Now we report a record low noise equivalent power (NEP) of 50 zW/rtHz, which is reduced to 20 zW/rtHz by introducing a Josephson parametric amplifier to the readout circuitry. The lower NEP value suggests energy resolution of h×480 GHz. Sensitivity of the detector can be further increased by decreasing the heat capacity of the absorbing element. To this end, we have experimentally studied graphene as an absorber, which is promising material due to its two-dimensional structure. Our preliminary results suggest energy resolution of h×60 GHz, bringin resolution of thermal detectors close to the qubit-based detectors while maintaining superior detection bandwidth.
*We acknowledge funding from the European Research Council under Consolidator Grant No. 681311 (QUESS) and under Proof of Concept Grant No. 727305 (SNABO), the Academy of Finland through grant nos 312300, 312059, 312294, 314447, 314449, 276528, 305237, 308161, and 314302, the Vilho, Yrjö and Kalle Väisälä Foundation, the Technology Industries of Finland Centennial Foundation, the Jane and Aatos Erkko Foundation, and the Finnish Cultural Foundation.
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Presenters
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Roope Kokkoniemi
- QCD Labs, Aalto University