Elongated quantum dot as a distributed charge sensor Article Swipe

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S. M. Patomäki , J. Williams , Fabrizio Berritta , C. Lainé , M. A. Fogarty , R. C. C. Leon , Julien Jussot , Stefan Kubicek , A. Chatterjee , B. Govoreanu , Ferdinand Kuemmeth , John J. L. Morton , M. Fernando González-Zalba ·

YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.1103/physrevapplied.21.054042

Increasing the separation between semiconductor quantum dots offers scaling advantages by facilitating gate routing and the integration of sensors and charge reservoirs. Elongated quantum dots have been utilized for this purpose in GaAs heterostructures to extend the range of spin-spin interactions. Here, we study a MOS device where two quantum dot arrays are separated by an elongated quantum dot (340 nm long, 50 nm wide). We monitor charge transitions of the elongated quantum dot by measuring radiofrequency single-electron currents to a reservoir to which we connect a lumped-element resonator. We operate the dot as a single-electron box to achieve charge sensing of remote quantum dots in each array, separated by an edge-to-edge distance of 480 nm. Charge detection on both ends of the elongated dot at a coinciding setpoint demonstrates that the charge states are well distributed across its nominal length, supported by the simulated quantum mechanical electron density. Likewise, we show elongated-peripheral quantum dot tunnel couplings can exceed 20GHz, above the electron temperature, fulfilling the requirement for mediated exchange. Our results illustrate how single-electron boxes can be realized with versatile footprints that may enable compact quantum processor layouts, offering distributed charge sensing in addition to the possibility of mediated coupling. Published by the American Physical Society 2024

Related Topics

Condensed Matter Physics

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Quantum dot Charge (physics) Physics Quantum point contact Electron Quantum dot laser Spin (aerodynamics) Condensed matter physics Optoelectronics Quantum well Semiconductor Quantum mechanics Semiconductor laser theory Laser Thermodynamics

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Type: article
Language: en
Landing Page: https://doi.org/10.1103/physrevapplied.21.054042
PDF: http://link.aps.org/pdf/10.1103/PhysRevApplied.21.054042
OA Status: hybrid
Cited By: 4
References: 56
Related Works: 10
OpenAlex ID: https://openalex.org/W4398203340

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DOI: https://doi.org/10.1103/physrevapplied.21.054042

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Title: Elongated quantum dot as a distributed charge sensor

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Language: en

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Publication year: 2024

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Publication date: 2024-05-22

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Authors: S. M. Patomäki, J. Williams, Fabrizio Berritta, C. Lainé, M. A. Fogarty, R. C. C. Leon, Julien Jussot, Stefan Kubicek, A. Chatterjee, B. Govoreanu, Ferdinand Kuemmeth, John J. L. Morton, M. Fernando González-Zalba

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Landing page: https://doi.org/10.1103/physrevapplied.21.054042

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PDF URL: https://link.aps.org/pdf/10.1103/PhysRevApplied.21.054042

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Concepts: Quantum dot, Charge (physics), Physics, Quantum point contact, Electron, Quantum dot laser, Spin (aerodynamics), Condensed matter physics, Optoelectronics, Quantum well, Semiconductor, Quantum mechanics, Semiconductor laser theory, Laser, Thermodynamics

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Cited by: 4

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Citations by year (recent): 2025: 2, 2024: 1, 2023: 1

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