Entangling gates on degenerate spin qubits dressed by a global field

Ingvild Hansen (), Amanda E. Seedhouse, Santiago Serrano, Andreas Nickl, MengKe Feng, Jonathan Y. Huang, Tuomo Tanttu, Nard Dumoulin Stuyck, Wee Han Lim, Fay E. Hudson, Kohei M. Itoh, Andre Saraiva, Arne Laucht, Andrew S. Dzurak () and Chih Hwan Yang ()
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Ingvild Hansen: The University of New South Wales
Amanda E. Seedhouse: The University of New South Wales
Santiago Serrano: The University of New South Wales
Andreas Nickl: The University of New South Wales
MengKe Feng: The University of New South Wales
Jonathan Y. Huang: The University of New South Wales
Tuomo Tanttu: The University of New South Wales
Nard Dumoulin Stuyck: The University of New South Wales
Wee Han Lim: The University of New South Wales
Fay E. Hudson: The University of New South Wales
Kohei M. Itoh: Keio University
Andre Saraiva: The University of New South Wales
Arne Laucht: The University of New South Wales
Andrew S. Dzurak: The University of New South Wales
Chih Hwan Yang: The University of New South Wales

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Semiconductor spin qubits represent a promising platform for future large-scale quantum computers owing to their excellent qubit performance, as well as the ability to leverage the mature semiconductor manufacturing industry for scaling up. Individual qubit control, however, commonly relies on spectral selectivity, where individual microwave signals of distinct frequencies are used to address each qubit. As quantum processors scale up, this approach will suffer from frequency crowding, control signal interference and unfeasible bandwidth requirements. Here, we propose a strategy based on arrays of degenerate spins coherently dressed by a global control field and individually addressed by local electrodes. We demonstrate simultaneous on-resonance driving of two degenerate qubits using a global field while retaining addressability for qubits with equal Larmor frequencies. Furthermore, we implement SWAP oscillations during on-resonance driving, constituting the demonstration of driven two-qubit gates. Significantly, our findings highlight how dressing can overcome the fragility of entangling gates between superposition states and increase their noise robustness. These results constitute a paradigm shift in qubit control in order to overcome frequency crowding in large-scale quantum computing.

Date: 2024
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DOI: 10.1038/s41467-024-52010-4

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