Controllable Single Cooper Pair Splitting in Hybrid Quantum Dot Systems

Damaz de Jong, Christian G. Prosko, Lin Han, Filip K. Malinowski, Yu Liu, Leo P. Kouwenhoven, Wolfgang Pfaff

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Cooper pair splitters hold utility as a platform for investigating the entanglement of electrons in Cooper pairs, but probing splitters with voltage-biased Ohmic contacts prevents the retention of electrons from split pairs since they can escape to the drain reservoirs. We report the ability to controllably split and retain single Cooper pairs in a multi-quantum-dot device isolated from lead reservoirs, and separately demonstrate a technique for detecting the electrons emerging from a split pair. First, we identify a coherent Cooper pair splitting charge transition using dispersive gate sensing at GHz frequencies. Second, we utilize a double quantum dot as an electron parity sensor to detect parity changes resulting from electrons emerging from a superconducting island.

Original languageEnglish
Article number157001
Number of pages7
JournalPhysical review letters
Volume131
Issue number15
DOIs
Publication statusPublished - 2023

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