Superconducting Electrometer for Measuring the Single Cooper Pair Box

A. Cottet, A. Steinbach, P. Joyez, D. Vion, H. Pothier, D. Esteve and M. E. Huber
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A. Cottet: Service de Physique de l’Etat Condensé, CEA-Saclay
A. Steinbach: Service de Physique de l’Etat Condensé, CEA-Saclay
P. Joyez: Service de Physique de l’Etat Condensé, CEA-Saclay
D. Vion: Service de Physique de l’Etat Condensé, CEA-Saclay
H. Pothier: Service de Physique de l’Etat Condensé, CEA-Saclay
D. Esteve: Service de Physique de l’Etat Condensé, CEA-Saclay
M. E. Huber: University of Colorado at Denver, Department of Physics

A chapter in Macroscopic Quantum Coherence and Quantum Computing, 2001, pp 111-125 from Springer

Abstract: Abstract We discuss for the single Cooper pair box the contributions to relaxation and to decoherenee of the electromagnetic environment, of the offset charg enoise, and of a measuring Single Electron Transistor. We show that a single Cooper pair transistor can also be used for that purpose. Experimentally, we have operated such a device by measuring the variations of its critical supercurrent with the gate voltage using a SQUID series array amplifier. We describe the characteristics of this new electrometer and compare different schemes for measuring the critical current.

Keywords: Critical Current; Cooper Pair; Single Electron Transistor; Electromagnetic Environment; Decoherence Rate (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/978-1-4615-1245-5_12

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