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

Journal Article · · Nature Communications
 [1];  [2];  [1];  [1];  [3];  [4];  [5];  [1];  [6];  [7];  [7];  [8];  [8];  [8];  [8];  [7];  [7];  [9];  [10];  [11] more »;  [10];  [1] « less
  1. Univ. of New South Wales, Sydney, NSW (Australia); Australian Research Council (ARC) (Australia). Centre of Excellence for Quantum Computation and Communication Technology
  2. 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)
  3. 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)
  4. 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)
  5. 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)
  6. Univ. of New South Wales, Sydney, NSW (Australia)
  7. Univ. of New South Wales, Sydney, NSW (Australia); Diraq, Sydney, NSW (Australia)
  8. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  9. Keio University (Japan)
  10. Australian Research Council (ARC) (Australia). Centre of Excellence for Quantum Computation and Communication Technology; Univ. of Melbourne, VIC (Australia)
  11. Royal Melbourne Institute of Technology (RMIT), VIC (Australia)
+ Show Author Affiliations
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.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
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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Related Subjects

42 ENGINEERING
quantum information
qubits