Entanglement of a nuclear spin qubit register in silicon photonics
Source abstract
Abstract
Colour centres provide an optical interface to quantum registers based on electron and nuclear spin qubits in solids. The T centre in silicon is an emerging spin-photon interface that combines telecom O-band optical transitions and an electron spin in a scalable photonics platform. Here we integrate T centres into single-mode photonic waveguides in a silicon-on-insulator platform. We demonstrate the initialization, coherent control and state read-out of a three-qubit register based on the electron spin of a T centre coupled to a hydrogen and a silicon nuclear spin. The spin register exhibits spin echo coherence times of 0.41(2) ms for the electron spin, 112(12) ms for the hydrogen nuclear spin and 67(7) ms for the silicon nuclear spin. We use nuclear-nuclear two-qubit gates to generate entanglement between the two nuclear spins with a fidelity of F = 0.77(3) and a coherence time of T2*=2.60(8) ms. Our results show that a T centre in silicon photonics can realize a multi-qubit register with an optical interface for quantum communication.
Source: europepmc · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Quantum and electron transport phenomena · Quantum Information and Cryptography · Diamond and Carbon-based Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (38)
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1. Awschalom, D. D., Hanson, R., Wrachtrup, J. & Zhou, B. B. Quantum technologies with optically interfaced solid-state spins. Nat. Photonics 12, 516–527 (2018).10.1038/s41566-018-0232-2 ↗
2. Gao, W. B., Imamoglu, A., Bernien, H. & Hanson, R. Coherent manipulation, measurement and entanglement of individual solid-state spins using optical fields. Nat. Photonics 9, 363–373 (2015).10.1038/nphoton.2015.58 ↗
3. Atatüre, M., Englund, D., Vamivakas, N., Lee, S.-Y. & Wrachtrup, J. Material platforms for spin-based photonic quantum technologies. Nat. Rev. Mater. 3, 38–51 (2018).10.1038/s41578-018-0008-9 ↗
4. Taminiau, T. H. et al. Detection and control of individual nuclear spins using a weakly coupled electron spin. Phys. Rev. Lett. 109, 137602 (2012).10.1103/PhysRevLett.109.137602 ↗
5. Bradley, C. E. et al. A ten-qubit solid-state spin register with quantum memory up to one minute. Phys. Rev. X 9, 031045 (2019).
6. Ferrenti, A. M., de Leon, N. P., Thompson, J. D. & Cava, R. J. Identifying candidate hosts for quantum defects via data mining. NPJ Comput. Mater. 6, 126 (2020).10.1038/s41524-020-00391-7 ↗
7. Onizhuk, M. & Galli, G. Colloquium: decoherence of solid-state spin qubits: a computational perspective. Rev. Mod. Phys. 97, 021001 (2025).10.1103/RevModPhys.97.021001 ↗
8. Hensen, B. et al. Loophole-free Bell inequality violation using electron spins separated by 1.3 kilometres. Nature 526, 682–686 (2015).10.1038/nature15759 ↗
9. Knaut, C. M. et al. Entanglement of nanophotonic quantum memory nodes in a telecom network. Nature 629, 573–578 (2024).10.1038/s41586-024-07252-z ↗
10. Ruskuc, A. et al. Multiplexed entanglement of multi-emitter quantum network nodes. Nature 639, 54–59 (2025).10.1038/s41586-024-08537-z ↗
11. Bergeron, L. et al. Silicon-integrated telecommunications photon-spin interface. PRX Quantum 1, 020301 (2020).10.1103/PRXQuantum.1.020301 ↗
12. Higginbottom, D. B. et al. Optical observation of single spins in silicon. Nature 607, 266–270 (2022).10.1038/s41586-022-04821-y ↗
13. Alexander, P. T. K. et al. A manufacturable platform for photonic quantum computing. Nature 641, 876–883 (2025).10.1038/s41586-025-08820-7 ↗
14. Durand, A. et al. Broad diversity of near-infrared single-photon emitters in silicon. Phys. Rev. Lett. 126, 083602 (2021).10.1103/PhysRevLett.126.083602 ↗
15. Islam, F. et al. Cavity-enhanced emission from a silicon T center. Nano Lett. 24, 319–325 (2024).10.1021/acs.nanolett.3c04056 ↗
16. Johnston, A., Felix-Rendon, U., Wong, Y.-E. & Chen, S. Cavity-coupled telecom atomic source in silicon. Nat. Commun. 15, 2350 (2024).10.1038/s41467-024-46643-8 ↗
17. Komza, L. et al. Multiplexed color centers in a silicon photonic cavity array. Optica 12, 1400–1405 (2025).10.1364/OPTICA.564691 ↗
18. Inc, P. et al. Distributed quantum computing in silicon. Preprint at https://arxiv.org/abs/2406.01704 (2024).
19. Irion, E., Burger, N., Thonke, K. & Sauer, R. The defect luminescence spectrum at 0.9351 eV in carbon-doped heat-treated or irradiated silicon. J. Phys. C 18, 5069 (1985).10.1088/0022-3719/18/26/018 ↗
20. Safonov, A. N. et al. Interstitial-carbon hydrogen interaction in silicon. Phys. Rev. Lett. 77, 4812–4815 (1996).10.1103/PhysRevLett.77.4812 ↗
21. Clear, C. et al. Optical-transition parameters of the silicon T center. Phys. Rev. Appl. 22, 064014 (2024).10.1103/PhysRevApplied.22.064014 ↗
22. MacQuarrie, E. R. et al. Generating T centres in photonic silicon-on-insulator material by ion implantation. New J. Phys. 23, 103008 (2021).10.1088/1367-2630/ac291f ↗
23. de Lange, G., Wang, Z. H., Ristè, D., Dobrovitski, V. V. & Hanson, R. Universal dynamical decoupling of a single solid-state spin from a spin bath. Science 330, 60–63 (2010).10.1126/science.1192739 ↗
24. Jiang, L. et al. Repetitive readout of a single electronic spin via quantum logic with nuclear spin ancillae. Science 326, 267–272 (2009).10.1126/science.1176496 ↗
25. Neumann, P. et al. Single-shot readout of a single nuclear spin. Science 329, 542–544 (2010).10.1126/science.1189075 ↗
26. van de Stolpe, G. L. et al. Mapping a 50-spin-qubit network through correlated sensing. Nat. Commun. 15, 2006 (2024).10.1038/s41467-024-46075-4 ↗
27. Shi, F. et al. Sensing and atomic-scale structure analysis of single nuclear-spin clusters in diamond. Nat. Phys. 10, 21–25 (2014).10.1038/nphys2814 ↗
28. Bartling, H. P. et al. Entanglement of spin-pair qubits with intrinsic dephasing times exceeding a minute. Phys. Rev. X 12, 011048 (2022).
29. Mehring, M., Mende, J. & Scherer, W. Entanglement between an electron and a nuclear spin $$\frac{1}{2}$$. Phys. Rev. Lett. 90, 153001 (2003).10.1103/PhysRevLett.90.153001 ↗
30. Stemp, H. G. et al. Tomography of entangling two-qubit logic operations in exchange-coupled donor electron spin qubits. Nat. Commun. 15, 8415 (2024).10.1038/s41467-024-52795-4 ↗
31. Rong, X. et al. Experimental fault-tolerant universal quantum gates with solid-sate spins under ambient conditions. Nat. Commun. 6, 8748 (2015).10.1038/ncomms9748 ↗
32. Vandersypen, L. M. K. & Chuang, L. I. NMR techniques for quantum control and computation. Rev. Mod. Phys. 76, 1037–1069 (2005).10.1103/RevModPhys.76.1037 ↗
33. Dolde, F. et al. High-fidelity spin entanglement using optimal control. Nat. Commun. 5, 3371 (2014).10.1038/ncomms4371 ↗
34. Chen, Z. et al. Measuring and suppressing quantum state leakage in a superconducting qubit. Phys. Rev. Lett. 116, 020501 (2016).10.1103/PhysRevLett.116.020501 ↗
35. Beukers, H. K. C. et al. Control of solid-state nuclear spin qubits using an electron spin-1/2. Phys. Rev. X 15, 021011 (2025).
36. Muralidharan, S. et al. Optimal architectures for long distance quantum communication. Sci. Rep. 6, 20463 (2016).10.1038/srep20463 ↗
37. Russo, A., Barnes, E. & Economou, S. E. Generation of arbitrary all-photonic graph states from quantum emitters. New J. Phys. 21, 055002 (2019).10.1088/1367-2630/ab193d ↗
38. Song, H. Entanglement of a nuclear spin qubit register in silicon photonics. Zenodo https://doi.org/10.5281/zenodo.17239007 (2025).10.5281/zenodo.17239007 ↗