Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3127229
Keywords
leakage currents; single electron devices; superconducting energy gap; superconductive tunnelling
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Funding
- Technology Industries of Finland Centennial Foundation
- Academy of Finland
- Japan Science and Technology Agency
- EURAMET
- EU [217257, 218783]
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We present an experimental study of hybrid turnstiles with high charging energies in comparison to the superconducting gap. The device is modeled with the sequential tunneling approximation. The backtunneling effect is shown to limit the amplitude of the gate drive and thereby the maximum pumped current of the turnstile. We compare results obtained with sine and square wave drive and show how a fast rise time can suppress errors due to leakage current. Quantized current plateaus up to 160 pA are demonstrated.
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