Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits

Stemp, Holly G.; Asaad, Serwan; van Blankenstein, Mark R.; Vaartjes, Arjen; Johnson, Mark A. I.; Mądzik, Mateusz T.; Heskes, Amber J. A.; Firgau, Hannes R.; Su, Rocky Y.; Yang, Chih Hwan; Laucht, Arne; Ostrove, Corey Isaac; Rudinger, Kenneth Michael; Young, Kevin Christopher; Blume-Kohout, Robin J.; Hudson, Fay E.; Dzurak, Andrew S.; Itoh, Kohei M.; Jakob, Alexander M.; Johnson, Brett C.; Jamieson, David N.; Morello, Andrea

doi:10.1038/s41467-024-52795-4

Title: Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits

Journal Article · 28 September 2024 · Nature Communications

DOI: https://doi.org/10.1038/s41467-024-52795-4 · OSTI ID:2472759

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^[2]; van Blankenstein, Mark R. ^[1]; Vaartjes, Arjen ^[1]; Johnson, Mark A. I. ^[3];

^[4]; Heskes, Amber J. A. ^[5]; Firgau, Hannes R. ^[1]; Su, Rocky Y. ^[6];

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^[8]; Young, Kevin Christopher ^[8];

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Univ. of New South Wales, Sydney, NSW (Australia); Australian Research Council (ARC) (Australia). Centre of Excellence for Quantum Computation and Communication Technology
Univ. of New South Wales, Sydney, NSW (Australia); Australian Research Council (ARC) (Australia). Centre of Excellence for Quantum Computation and Communication Technology; Quantum Machines, Copenhagen (Denmark)
Univ. of New South Wales, Sydney, NSW (Australia); Australian Research Council (ARC) (Australia). Centre of Excellence for Quantum Computation and Communication Technology; Quantum Motion, London (United Kingdom)
Univ. of New South Wales, Sydney, NSW (Australia); Australian Research Council (ARC) (Australia). Centre of Excellence for Quantum Computation and Communication Technology; Intel Corporation, Hillsboro, OR (United States)
Univ. of New South Wales, Sydney, NSW (Australia); Australian Research Council (ARC) (Australia). Centre of Excellence for Quantum Computation and Communication Technology; Univ. of Twente, Enschede (Netherlands)
Univ. of New South Wales, Sydney, NSW (Australia)
Univ. of New South Wales, Sydney, NSW (Australia); Diraq, Sydney, NSW (Australia)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Keio University (Japan)
Australian Research Council (ARC) (Australia). Centre of Excellence for Quantum Computation and Communication Technology; Univ. of Melbourne, VIC (Australia)
Royal Melbourne Institute of Technology (RMIT), VIC (Australia)

Scalable quantum processors require high-fidelity universal quantum logic operations in a manufacturable physical platform. Donors in silicon provide atomic size, excellent quantum coherence and compatibility with standard semiconductor processing, but no entanglement between donor-bound electron spins has been demonstrated to date. Here we present the experimental demonstration and tomography of universal one- and two-qubit gates in a system of two weakly exchange-coupled electrons, bound to single phosphorus donors introduced in silicon by ion implantation. We observe that the exchange interaction has no effect on the qubit coherence. We quantify the fidelity of the quantum operations using gate set tomography (GST), and we use the universal gate set to create entangled Bell states of the electrons spins, with fidelity 91.3 ± 3.0%, and concurrence 0.87 ± 0.05. These results form the necessary basis for scaling up donor-based quantum computers.

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Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 2472759

Report Number(s):: SAND--2024-14172J

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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