Photon-assisted tunneling in electron pumps

We measure photon-assisted tunneling in 4- and 6-junction electron pumps at photon frequencies up to 60 GHz. We determine the microwave voltage at the pumps using noise thermometry. The standard theory of leakage in the electron pump, modified to include photon-assisted tunneling, describes our expe...

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Bibliographic Details
Published in:Physical review letters 2000-05, Vol.84 (22), p.5192-5195
Main Authors: Covington, M, Keller, MW, Kautz, RL, Martinis, JM
Format: Article
Language:English
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Summary:We measure photon-assisted tunneling in 4- and 6-junction electron pumps at photon frequencies up to 60 GHz. We determine the microwave voltage at the pumps using noise thermometry. The standard theory of leakage in the electron pump, modified to include photon-assisted tunneling, describes our experiments well. From this test of theory we argue that, in the absence of external microwaves, photon-assisted tunneling driven by 1/f noise is an important error mechanism in electron pumps.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.84.5192