Revealing charge-tunneling processes between a quantum dot and a superconducting island through gate sensing

Jasper Van Veen; Damaz De Jong; Lin Han; Christian Prosko; Peter Krogstrup; John D. Watson; Leo P. Kouwenhoven; Wolfgang Pfaff

doi:10.1103/PhysRevB.100.174508

Revealing charge-tunneling processes between a quantum dot and a superconducting island through gate sensing

Jasper Van Veen, Damaz De Jong, Lin Han, Christian Prosko, Peter Krogstrup, John D. Watson, Leo P. Kouwenhoven, Wolfgang Pfaff

Research output: Contribution to journal › Article › peer-review

Abstract

We report direct detection of charge tunneling between a quantum dot and a superconducting island through radio-frequency gate sensing. We are able to resolve spin-dependent quasiparticle tunneling as well as two-particle tunneling involving Cooper pairs. The quantum dot can act as an RF-only sensor to characterize the superconductor addition spectrum, enabling us to access subgap states without transport. Our results provide guidance for future dispersive parity measurements of Majorana modes, which can be realized by detecting the parity-dependent tunneling between dots and islands.

Original language	English (US)
Article number	174508
Journal	Physical Review B
Volume	100
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.100.174508
State	Published - Nov 8 2019
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.100.174508

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title = "Revealing charge-tunneling processes between a quantum dot and a superconducting island through gate sensing",

abstract = "We report direct detection of charge tunneling between a quantum dot and a superconducting island through radio-frequency gate sensing. We are able to resolve spin-dependent quasiparticle tunneling as well as two-particle tunneling involving Cooper pairs. The quantum dot can act as an RF-only sensor to characterize the superconductor addition spectrum, enabling us to access subgap states without transport. Our results provide guidance for future dispersive parity measurements of Majorana modes, which can be realized by detecting the parity-dependent tunneling between dots and islands.",

author = "{Van Veen}, Jasper and {De Jong}, Damaz and Lin Han and Christian Prosko and Peter Krogstrup and Watson, {John D.} and Kouwenhoven, {Leo P.} and Wolfgang Pfaff",

note = "Funding Information: We thank B. van Heck, K. Flensberg, A. Geresdi, A. Kou, and T. Karzig for useful discussions and J. M. Hornibrook and D. J. Reilly for providing the frequency multiplexing chips. This work has been supported by the Netherlands Organization for Scientific Research (NWO), Microsoft, the Danish National Research Foundation, the European Research Council, and a Justus and Louise van Effen excellence scholarship. Publisher Copyright: {\textcopyright} 2019 American Physical Society.",

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AU - De Jong, Damaz

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AU - Prosko, Christian

AU - Krogstrup, Peter

AU - Watson, John D.

AU - Kouwenhoven, Leo P.

AU - Pfaff, Wolfgang

N1 - Funding Information: We thank B. van Heck, K. Flensberg, A. Geresdi, A. Kou, and T. Karzig for useful discussions and J. M. Hornibrook and D. J. Reilly for providing the frequency multiplexing chips. This work has been supported by the Netherlands Organization for Scientific Research (NWO), Microsoft, the Danish National Research Foundation, the European Research Council, and a Justus and Louise van Effen excellence scholarship. Publisher Copyright: © 2019 American Physical Society.

PY - 2019/11/8

Y1 - 2019/11/8

N2 - We report direct detection of charge tunneling between a quantum dot and a superconducting island through radio-frequency gate sensing. We are able to resolve spin-dependent quasiparticle tunneling as well as two-particle tunneling involving Cooper pairs. The quantum dot can act as an RF-only sensor to characterize the superconductor addition spectrum, enabling us to access subgap states without transport. Our results provide guidance for future dispersive parity measurements of Majorana modes, which can be realized by detecting the parity-dependent tunneling between dots and islands.

AB - We report direct detection of charge tunneling between a quantum dot and a superconducting island through radio-frequency gate sensing. We are able to resolve spin-dependent quasiparticle tunneling as well as two-particle tunneling involving Cooper pairs. The quantum dot can act as an RF-only sensor to characterize the superconductor addition spectrum, enabling us to access subgap states without transport. Our results provide guidance for future dispersive parity measurements of Majorana modes, which can be realized by detecting the parity-dependent tunneling between dots and islands.

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Revealing charge-tunneling processes between a quantum dot and a superconducting island through gate sensing

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