Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits
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.
Authors
- Kohei M. Itoh (ORCID: https://orcid.org/0000-0002-8153-4893)
- Arne Laucht (ORCID: https://orcid.org/0000-0001-7892-7963)
- Amber Heskes
- Mark A. I. Johnson (ORCID: https://orcid.org/0000-0002-5818-0134)
- David N. Jamieson (ORCID: https://orcid.org/0000-0001-7733-6715)
- Chih Hwan Yang (ORCID: https://orcid.org/0000-0002-8713-150X)
- Kevin Young (ORCID: https://orcid.org/0000-0002-4679-4542)
- Hannes R. Firgau (ORCID: https://orcid.org/0000-0002-9655-6227)
- Holly G. Stemp (ORCID: https://orcid.org/0000-0003-3076-5517)
- Andrew S. Dzurak (ORCID: https://orcid.org/0000-0003-1389-5096)
- Alexander Jakob (ORCID: https://orcid.org/0000-0002-2794-404X)
- Arjen Vaartjes
- Robin Blume-Kohout (ORCID: https://orcid.org/0000-0001-8134-948X)
- Fay E. Hudson (ORCID: https://orcid.org/0000-0003-0134-3657)
- Mark R. van Blankenstein
- Andrea Morello (ORCID: https://orcid.org/0000-0001-7445-699X)
- Kenneth Rudinger (ORCID: https://orcid.org/0000-0002-3038-4389)
- Corey Ostrove (ORCID: https://orcid.org/0000-0001-8274-3331)
- Serwan Asaad (ORCID: https://orcid.org/0000-0002-6407-4434)
- Mateusz Mądzik (ORCID: https://orcid.org/0000-0003-4857-3257)
- Brett C. Johnson (ORCID: https://orcid.org/0000-0002-2174-4178)
- Rocky Y. Su
Institutions
- Intel (United States) (US)
- The University of Melbourne (AU)
- Sandia National Laboratories California (US)
- Keio University (JP)
- UNSW Sydney (AU)
- Quantum Motion Technologies (United Kingdom) (GB)
- Centre for Quantum Computation and Communication Technology (AU)
- QuantumWise (Denmark) (DK)
- RMIT University (AU)
- University of Twente (NL)
Publication Details
- Journal
- Nature Communications
- Published
- 2024-09-28
- DOI
- https://doi.org/10.1038/s41467-024-52795-4
- Citations
- 10
- Primary Topic
- Quantum and electron transport phenomena
- Type
- article
- Field-Weighted Citation Impact
- 3.38
Funders
- U.S. Department of Energy
- Australian National Fabrication Facility
- Australian Government
- University of New South Wales
- Office of Science
- National Nuclear Security Administration
- Australian Research Council
- Centre of Excellence for Quantum Computation and Communication Technology, Australian Research Council
- Army Research Office
- Sandia National Laboratories