Thermal spectrometer for superconducting circuits
Superconducting circuits provide a versatile and controllable platform for studies of fundamental quantum phenomena as well as for quantum technology applications. A conventional technique to read out the state of a quantum circuit or to characterize its properties is based on rf measurement schemes...
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Zusammenfassung: | Superconducting circuits provide a versatile and controllable platform for
studies of fundamental quantum phenomena as well as for quantum technology
applications. A conventional technique to read out the state of a quantum
circuit or to characterize its properties is based on rf measurement schemes
involving costly and complex instrumentation. Here we demonstrate a simple dc
measurement of a thermal spectrometer to investigate properties of a
superconducting circuit, in this proof-of-concept experiment a coplanar
waveguide resonator. A fraction of the microwave photons in the resonator is
absorbed by an on-chip bolometer, resulting in a measurable temperature rise.
By monitoring the dc signal of the thermometer due to this process, we are able
to determine the resonance frequency and the lineshape (quality factor) of the
resonator. The demonstrated scheme, which is a simple dc measurement, has a
wide band up to 200 GHz, well exceeding that of the typical rf spectrometer.
Moreover, the thermal measurement yields a highly frequency independent
reference level of the Lorentzian absorption signal, unlike the conventional rf
measurement. In the low power regime, the measurement is fully
calibration-free. Our technique thus offers an alternative spectrometer for
quantum circuits, which is in many ways superior with respect to conventional
methods. |
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DOI: | 10.48550/arxiv.2409.13417 |