Measured flatness of microwave-induced steps at Josephson tunnel junctions with near-zero-current bias
| Autor: | G. E. W. Brunk, Guang-Ying Cui, J. Niemeyer, J. H. Hinken |
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| Rok vydání: | 1982 |
| Předmět: |
Physics
Josephson effect Noise temperature Condensed matter physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Noise (electronics) law.invention SQUID Pi Josephson junction law Condensed Matter::Superconductivity Superconducting tunnel junction Electrical and Electronic Engineering Resistor Instrumentation Voltage drop |
| Zdroj: | IEEE Transactions on Instrumentation and Measurement. :223-226 |
| ISSN: | 1557-9662 0018-9456 |
| DOI: | 10.1109/tim.1982.6312479 |
| Popis: | In voltage standards that use series-connected hysteretic Josephson tunnel junctions with zero-current bias, the working point on a microwave induced step is not the middle of the step. Towards the ends of a step, theories predict that noise will produce appreciable deviations from the well-defined DC voltage. Measurements of these deviations on the zeroth and first step are presented. The voltage across the Josephson junction was compared with the voltage drop produced across a cryogenic resistor by passing a SQUID-stabilized current through it. The voltage difference, down to the picovolt region, was detected by a second SQUID. Experimental results are compared with theoretically calculated values. With the equivalent noise temperature, external as well as intrinsic noise can be taken into account when designing a voltage standard with zero-current-biased Josephson junctions. |
| Databáze: | OpenAIRE |
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