Controllable Single Cooper Pair Splitting in Hybrid Quantum Dot Systems

Controllable Single Cooper Pair Splitting in Hybrid Quantum Dot Systems

de Jong, D. (TU Delft BUS/Quantum Delft; Kavli institute of nanoscience Delft; QuTech)
Prosko, C.G. (TU Delft QRD/Kouwenhoven Lab; Kavli institute of nanoscience Delft; QuTech)
Han, L. (TU Delft QRD/Wimmer Group; Kavli institute of nanoscience Delft; QuTech)
Malinowski, F.K. (TU Delft BUS/TNO STAFF; Kavli institute of nanoscience Delft; QuTech)
Liu, Yu (University of Copenhagen)
Kouwenhoven, Leo P. (TU Delft QN/Kouwenhoven Lab; Kavli institute of nanoscience Delft; QuTech)
Pfaff, Wolfgang (University of Illinois at Urbana Champaign)

2023

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.

http://resolver.tudelft.nl/uuid:e95574c9-35e0-4c24-b006-fc8ade3fa0a0

https://doi.org/10.1103/PhysRevLett.131.157001

0031-9007

Physical Review Letters, 131 (15)

Institutional Repository

journal article

© 2023 D. de Jong, C.G. Prosko, L. Han, F.K. Malinowski, Yu Liu, Leo P. Kouwenhoven, Wolfgang Pfaff