Research output per year
Research output per year
Personal profile
Research Interests
I'm working to develop quantum information devices using rare earth ions in crystals, including quantum memories, quantum repeaters, quantum transducers and optical quantum processors. I study the optical and spin properties of the rare earth ions with high-resolution optical spectroscopy, with a focus on high concentration crystals and on interactions between the rare earth ions. I aim to determine how material properties affect the performance of devices such as quantum memories, and to use this information to improve device performance.
Education/Academic qualification
Physics, PhD, Evaluation of a stoichiometric rare earth crystal for quantum computing, Research School of Physics
Award Date: 10 Dec 2013
Research student supervision
- Registered to supervise
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Collaborations and top research areas from the last five years
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Long optical and electron spin coherence times for erbium ions in silicon
Berkman, I. R., Lyasota, A., de Boo, G. G., Bartholomew, J. G., Lim, S. Q., Johnson, B. C., McCallum, J. C., Xu, B. B., Xie, S., Abrosimov, N. V., Pohl, H. J., Ahlefeldt, R. L., Sellars, M. J., Yin, C. & Rogge, S., 2025, In: npj Quantum Information. 11, 1, 10 p., 66.Research output: Contribution to journal › Article › peer-review
Open Access18 Citations (Scopus) -
Nuclear Spins in a Solid Exceeding 10-Hour Coherence Times for Ultra-Long-Term Quantum Storage
Wang, F., Ren, M., Sun, W., Guo, M., Sellars, M. J., Ahlefeldt, R. L., Bartholomew, J. G., Yao, J., Liu, S. & Zhong, M., 3 Jan 2025, In: PRX Quantum. 6, 1, 12 p., 010302.Research output: Contribution to journal › Article › peer-review
Open Access26 Citations (Scopus) -
Er sites in Si for quantum information processing
Lyasota, A., Berkman, I. R., de Boo, G. G., Bartholomew, J. G., Lim, S. Q., Johnson, B. C., McCallum, J. C., Xu, B. B., Xie, S., Ahlefeldt, R. L., Sellars, M. J., Yin, C. & Rogge, S., 2024, Quantum 2.0 in Proceedings Quantum 2.0 Conference and Exhibition. Optica Publishing Group, (Quantum 2.0 in Proceedings Quantum 2.0 Conference and Exhibition).Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › peer-review
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Effect of a hybrid transition moment on Stark-modulated photon echoes in Er3+: Y2SiO5
Ahlefeldt, R. L., Lyasota, A., Smith, J., Ren, J. & Sellars, M. J., 15 Nov 2023, In: Physical Review B. 108, 19, 195122.Research output: Contribution to journal › Article › peer-review
2 Citations (Scopus) -
Negative Refractive Index in Dielectric Crystals Containing Stoichiometric Rare-Earth Ions
Berrington, M. C., Sellars, M. J., Longdell, J. J., Rønnow, H. M., Vallabhapurapu, H. H., Adambukulam, C., Laucht, A. & Ahlefeldt, R. L., 18 Dec 2023, In: Advanced Optical Materials. 11, 24, 2301167.Research output: Contribution to journal › Article › peer-review
Open Access9 Citations (Scopus)
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Discovery and optimisation of rare-earth quantum materials
Chilton, N. (PI), Ahlefeldt, R. (CoI) & Reid, M. F. (CoI)
18/03/26 → 17/03/29
Project: Research
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A memory-enabled linear optics quantum processor
Ahlefeldt, R. (PI), Bartholomew, J. (CoI), Bowen, W. (CoI), Coppersmith, S. (CoI), Doherty, A. (CoI), Longdell, J. (CoI), Lyasota, A. (CoI), Rogge, S. (CoI), Sellars, M. (CoI) & Stuart, J. (CoI)
10/03/26 → 10/03/28
Project: Research
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Comprehensive testbed for optical quantum technology
Ahlefeldt, R. (PI), Bartholomew, J. (CoI), Laplane, C. (CoI), Lu, Y. (CoI), Nair, S. R. (CoI), Pla, J. (CoI), Rogge, S. (CoI), Sellars, M. (CoI), Sukhorukov, A. (CoI), Vallabhapurapu, H. (CoI), White, A. G. (CoI), White, A. G. (CoI), Yi, X. (CoI) & Zhao, J. (CoI)
15/09/25 → 14/09/26
Project: Research
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Linking microwave and optical technologies for hybrid quantum networks
Ahlefeldt, R. (PI) & Gillan, L. (CoI)
13/01/24 → 12/12/27
Project: Research
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Implementing technologies to enable the quantum internet
Ahlefeldt, R. (PI) & Sellars, M. (CoI)
13/11/23 → 13/11/26
Project: Research