High-Fidelity Electron Spin Gates for Scaling Diamond Quantum Registers
Diamond is a promising platform for quantum information processing as it can host highly coherent qubits that could allow for the construction of large quantum registers. A prerequisite for such devices is a coherent interaction between nitrogen-vacancy (NV) electron spins enabling scalable entanglement. Entanglement between dipolar-coupled NV spin pairs has been demonstrated but with a limited fidelity, and its error sources have not been characterized. Here, we design and implement a robust two-qubit gate between NV electron spins in diamond and quantify the influence of multiple error sources on the gate performance. Experimentally, we demonstrate a record gate fidelity of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msub><a:mrow><a:mi>F</a:mi></a:mrow><a:mrow><a:mn>2</a:mn><a:mi mathvariant="normal">q</a:mi></a:mrow></a:msub><a:mo>=</a:mo><a:mo stretchy="false">(</a:mo><a:mn>96.0</a:mn><a:mo>±</a:mo><a:mn>2.5</a:mn><a:mo stretchy="false">)</a:mo><a:mi>%</a:mi></a:mrow></a:math> under ambient conditions. Our identification of the dominant errors paves the way towards NV-NV gates beyond the error correction threshold.
Authors
- Timo Joas (ORCID: https://orcid.org/0000-0002-0195-7053)
- Tommaso Calarco (ORCID: https://orcid.org/0000-0001-5364-7316)
- Fedor Jelezko (ORCID: https://orcid.org/0000-0001-5759-3917)
- Ressa S. Said (ORCID: https://orcid.org/0000-0003-4510-6397)
- Shinobu Onoda (ORCID: https://orcid.org/0000-0003-1425-0708)
- Philipp J. Vetter (ORCID: https://orcid.org/0000-0003-2812-3996)
- Matthias M. Müller (ORCID: https://orcid.org/0000-0002-1428-9680)
- Genko T. Genov (ORCID: https://orcid.org/0000-0002-4538-6686)
- Tokuyuki Teraji (ORCID: https://orcid.org/0000-0002-7731-0547)
- Jingfu Zhang (ORCID: https://orcid.org/0000-0002-5168-5885)
- Roberto Sailer (ORCID: https://orcid.org/0009-0005-9039-9426)
- Florian Ferlemann (ORCID: https://orcid.org/0009-0009-3555-9828)
Institutions
- Forschungszentrum Jülich (DE)
- National Institute for Materials Science (JP)
- Instituto de Física Teórica (ES)
- Center for Integrated Quantum Science and Technology (DE)
- National Institutes for Quantum Science and Technology (JP)
- Takasaki Advanced Radiation Research Institute (JP)
- University of Bologna (IT)
Publication Details
- Journal
- Physical Review X
- Published
- 2025-05-27
- DOI
- https://doi.org/10.1103/physrevx.15.021069
- Citations
- 8
- Primary Topic
- Diamond and Carbon-based Materials Research
- Type
- article
- Field-Weighted Citation Impact
- 4.14
Funders
- Carl-Zeiss-Stiftung
- European Commission
- Deutsche Forschungsgemeinschaft
- Ministry of Education, Culture, Sports, Science and Technology
- Bundesministerium für Bildung und Forschung
- Stiftung der Deutschen Wirtschaft
- Center for Integrated Quantum Science and Technology
- HORIZON EUROPE Framework Programme
- Japan Society for the Promotion of Science
- Moonshot Research and Development Program
- H2020 European Research Council
- HORIZON EUROPE European Research Council