Combining multiplexed gate-based readout and isolated CMOS quantum dot arrays

Pierre Hamonic, Martin Nurizzo, Jayshankar Nath, Matthieu C. Dartiailh, Victor Elhomsy, Mathis Fragnol, Biel Martinez, Pierre-Louis Julliard, Bruna Cardoso Paz, Mathilde Ouvrier-Buffet, Jean-Baptiste Filippini, Benoit Bertrand, Heimanu Niebojewski, Christopher Bäuerle, Maud Vinet, Franck Balestro, Tristan Meunier and Matias Urdampilleta ()
Additional contact information
Pierre Hamonic: Institut Néel
Martin Nurizzo: Institut Néel
Jayshankar Nath: Quobly
Matthieu C. Dartiailh: Quobly
Victor Elhomsy: Institut Néel
Mathis Fragnol: Institut Néel
Biel Martinez: Leti
Pierre-Louis Julliard: Quobly
Bruna Cardoso Paz: Quobly
Mathilde Ouvrier-Buffet: Institut Néel
Jean-Baptiste Filippini: Institut Néel
Benoit Bertrand: Leti
Heimanu Niebojewski: Leti
Christopher Bäuerle: Institut Néel
Maud Vinet: Quobly
Franck Balestro: Institut Néel
Tristan Meunier: Institut Néel
Matias Urdampilleta: Institut Néel

Nature Communications, 2025, vol. 16, issue 1, 1-7

Abstract: Abstract Semiconductor quantum dot arrays are a promising platform to perform spin-based error-corrected quantum computation with large numbers of qubits. However, due to the diverging number of possible charge configurations combined with the limited sensitivity of large-footprint charge sensors, achieving single-spin occupancy in each dot in a growing quantum dot array is exceedingly complex. Therefore, to scale-up a spin-based architecture we must change how individual charges are readout and controlled. Here, we demonstrate single-spin occupancy of each dot in a foundry-fabricated array by combining two methods. 1/ Loading a finite number of electrons into the quantum dot array; simplifying electrostatic tuning by isolating the array from the reservoirs. 2/ Deploying multiplex gate-based reflectometry to dispersively probe charge tunneling and spin states without charge sensors or reservoirs. Our isolated arrays probed by embedded multiplex readout can be readily electrostatically tuned. They are thus a viable, scalable approach for spin-based quantum architectures.

Date: 2025
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DOI: 10.1038/s41467-025-61556-w

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