Proof of concept of the quantum capacitance detector

Bueno, J.; Shaw, M. D.; Day, P. K.; Echternach, P. M.
March 2010
Applied Physics Letters;3/8/2010, Vol. 96 Issue 10, p103503
Academic Journal
We fabricated and tested a proof-of-concept quantum capacitance detector, a superconducting radiation detector described in a recent publication [Shaw et al., Phys. Rev. B 79, 144511 (2009)]. In this concept, quasiparticle tunneling in a single Cooper-pair box is used to measure the density of quasiparticles in a superconducting absorber. We measured and characterized the response of the device to electrical quasiparticle injection obtaining its sensitivity. Moreover, we have converted the sensitivity to electrical noise-equivalent power, which is in the 10-18 W/Hz1/2 range at loading powers between 10-15–10-16 W.


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