Charge and current fluctuations in a superconducting single-electron transistor near a Cooper pair resonance

Article

关键词: FREQUENCY SHOT-NOISE;    QUANTUM MEASUREMENT;    JOSEPHSON;    SENSITIVITY;   

DOI  :  10.1103/PhysRevB.67.045105

来源: SCIE

【 摘 要 】

We analyze charge tunneling statistics and current noise in a superconducting single-electron transistor in a regime where the Josephson-quasiparticle cycle is the dominant mechanism of transport. Due to the interplay between Coulomb blockade and Josephson coherence, the probability distribution for tunneling events strongly deviates from a Poissonian and displays a pronounced even-odd asymmetry in the number of transmitted charges. The interplay between charging and coherence is reflected also in the zero-frequency current noise which is significantly quenched when the quasiparticle tunneling rates are comparable to the coherent Cooper pair oscillation frequency. Furthermore, the finite frequency spectrum shows a strong enhancement near the resonant transition frequency for Josephson tunneling.

【 授权许可】

Free