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Full counting statistics of a superconducting beam splitter.
1Departement für Physik und Astronomie, Klingelbergstrasse 82, 4056 Basel, Switzerland.
Physical Review Letters
|May 15, 2002
Summary
We investigated charge transport in a mesoscopic device with superconducting and normal terminals. Large positive cross-correlations were found between currents in the normal arms, revealing detailed transport statistics.
Area of Science:
- Quantum electronics
- Mesoscopic physics
- Superconductivity
Background:
- Understanding charge transport in hybrid superconducting-normal systems is crucial for quantum device development.
- Mesoscopic devices offer a unique platform to study quantum phenomena in condensed matter.
Purpose of the Study:
- To investigate the full charge transport statistics in a three-terminal superconducting-normal device.
- To analyze cross-correlations between currents in normal terminals.
- To determine higher-order cumulants of charge transport.
Main Methods:
- Theoretical calculation of the full distribution of transmitted charges.
- Analysis of current cross-correlations in normal arms.
- Determination of the third cumulant of charge transport statistics.
Main Results:
- Observed large positive cross-correlations between currents in the two normal terminals over a wide parameter range.
- Calculated the complete charge transmission distribution.
- Identified the third cumulant, offering insights beyond current noise.
Conclusions:
- The study reveals significant cross-correlations in charge transport, highlighting complex quantum effects in mesoscopic devices.
- The third cumulant provides a more comprehensive understanding of charge transport statistics in superconducting-normal systems.