Description
Integrating Erbium trivalent ions in Silicon (Si) is the promising pathway towards telecom-compatible single photon sources with the spin degree of freedom, the quantum resource highly attractive for quantum communication and information processing [1, 2]. However, naturally occurring Si-29 in naturally abundant Si has a nonzero nuclear spin that could result in unwanted magnetic field fluctuations drastically shortening the electron spin coherence of Er ions at moderate magnetic fields. Here, we successfully fabricated bus waveguides coupled with photonic cavities on the Er-implanted Silicon on Insulator (SOI) substrate with the device Si layer isotopically purified using Si28 ion implantation [3]. Photonic waveguides were coupled with tapered optical fibers using evanescent couplers. We demonstrate up to 60% coupling efficiency from the bus waveguides to optical fiber channels. The measured quality factors of photonic modes in critically coupled photonic cavities were as high as 30000. Accounting for the cavity mode volume of ~0.04 m3, the expected optical Purcell enhancement is above 1000. The Er spin coherence in this nuclear-free environment will be comparable with the state-of-the-art values achieved in, i.e., bulk Si28. These results pave the way for scalable and efficient spin-photon interfaces.
| I am the presenting author | Yes |
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