Quantum-Limited Electrometer Based on Single Cooper Pair Tunneling
A. B. Zorin
DOI 10.1103/PhysRevLett.76.4408 · Physical Review Letters
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Abstract
We propose a system comprising the small-capacitance double Josephson junction shunted as a whole by a small resistance (RS≪RQ≡h/4e2). We have calculated the dynamic and noise characteristics of the system as functions of a polarization charge on the central electrode. It has been shown straightforwardly that the energy resolution of such an electrometer implying the “backaction noise” approaches the fundamental quantum limit ħ/2 when T→0.
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