Measurement of the excited-state lifetime of a microelectronic circuit

We demonstrate that a continuously measured microelectronic circuit, the Cooper-pair box measured by a radio-frequency single-electron transistor, approximates a quantum two-level system. We extract the Hamiltonian of the circuit through resonant spectroscopy and measure the excited-state lifetime....

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Bibliographic Details
Published in:Physical review letters 2003-01, Vol.90 (2), p.027002-027002, Article 027002
Main Authors: Lehnert, K W, Bladh, K, Spietz, L F, Gunnarsson, D, Schuster, D I, Delsing, P, Schoelkopf, R J
Format: Article
Language:English
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Summary:We demonstrate that a continuously measured microelectronic circuit, the Cooper-pair box measured by a radio-frequency single-electron transistor, approximates a quantum two-level system. We extract the Hamiltonian of the circuit through resonant spectroscopy and measure the excited-state lifetime. The lifetime is more than 10(5) times longer than the inverse transition frequency of the two-level system, even though the measurement is active. This lifetime is also comparable to an estimate of the known upper limit, set by spontaneous emission, for this circuit.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.90.027002