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Experimental Realization of a Differential Charge Qubit

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5 Author(s)
Shaw, M.D. ; Univ. of Southern California, Los Angeles ; Schneiderman, J.F. ; Palmer, B.. ; Delsing, P.
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We demonstrate the operation of a differential single Cooper-pair box, a charge qubit consisting of two aluminum islands, isolated from ground, coupled by a pair of small-area Josephson junctions. We have tested four devices, all of which show evidence of quasiparticle poisoning. The devices are characterized with microwave spectroscopy and temperature dependence studies.

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Applied Superconductivity, IEEE Transactions on  (Volume:17 ,  Issue: 2 )