Design of a Cooper pair box electrometer for application to solid-state and astroparticle physics
arXiv:1711.08758 · doi:10.1103/PhysRevApplied.11.054072
Abstract
We describe the design and principle of operation of a fast and sensitive electrometer operated at millikelvin temperatures, which aims at replacing conventional semiconducting charge amplifiers in experiments needing low back-action or high sensitivity. The electrometer consists of a Cooper Pair box (CPB) coupled to a microwave resonator, which converts charge variations to resonance frequency shifts. We analyze the dependence of the sensitivity on the various parameters of the device, and derive their optimization. By exploiting the nonlinearities of this electrometer, and using conventional nanofabrication and measurement techniques, a charge sensitivity of a few can be achieved which outperforms existing single charge electrometers.
arXiv comment13 pages, 7 figures
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- The Superconducting Quasiparticle-Amplifying Transmon: A Qubit-Based Sensor for meV Scale Phonons and Single THz Photons
- A Nonlinear Charge- and Flux-Tunable Cavity Derived from an Embedded Cooper Pair Transistor
- Charge sensitivity of a cavity-embedded Cooper pair transistor limited by single-photon shot noise