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Parity Fluctuations Between Coulomb Blockaded Superconducting Islands

Boldizsar Janko·Vinay Ambegaokar
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Abstract

We find that if two superconducting islands of different number parity are linked by a tunnel junction the unpaired electron in the odd island has a tendency to tunnel into the even island. This process leads to fluctuations in time of the number parity of each island, giving rise to a random telegraph noise spectrum with a characteristic frequency that has an unusual temperature dependence. This new phenomenon should be observable in a Cooper-pair pump and similar single-electron tunneling devices.

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Boldizsar Janko, Vinay Ambegaokar. 1995-05-08. Parity Fluctuations Between Coulomb Blockaded Superconducting Islands. https://doi.org/10.1103/physrevlett.75.1154

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