Figure 2 - uploaded by J. Bueno
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Measurements of the phase of the reflected signal from an SCB embedded in an LC tank circuit. A) Measurement of the phase as a function of time at the degeneracy point. The jumps correspond to a single quasiparticle tunneling on and off the island. Note the large phase shift (140 degrees) a quasiparticle can cause. B) Histogram of phase measurements showing an rms phase noise of 33 degrees or 1.8x10-3 radians/Hz 1/2 given a measurement bandwidth of 100 kHz C) Plot of phase histograms as a function of gate voltage. The position of the peaks trace the phase as a function of gate voltage for an SCB with and without an extra quasiparticle. White curves are theoretical estimates of quantum capacitance.
Source publication
We propose a sensitive new detector based on Cooper pair breaking in a superconductor. The quantum capacitor detector (QCD) exploits the extraordinary sensitivity of superconducting single-electron devices to the presence of quasiparticles generated by pair-breaking photons. This concept would enable single-photon detection at far-IR and sub-millim...
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