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THU: Thursday Contributed Sessions
THU 5: QIP Implementations: Interfaces
THU 5.6: Vortrag
Donnerstag, 11. September 2025, 15:30–15:45, ZHG006
Near Lifetime-limited NV Centers Integrated into Diamond Photonic Crystal Cavities — •Alok Gokhale1, Julian M. Bopp1,2, Laura Orphal-Kobin1, Kilian Unterguggenberger1, Marco E. Stucki1,2, Tommaso Pregnolato1,2, and Tim Schröder1,2 — 1Department of Physics, Humboldt Universität zu Berlin, Berlin, Germany — 2Ferdinand Braun Institute (FBH), Berlin, Germany
Candidate quantum network node platforms need to satisfy a variety of properties. These include: interfacing between stationary and flying qubits, long storage times, indistinguishable photons and a large photon flux. Nitrogen-vacancy centers in diamond (NV) weakly coupled to cavities fulfil most of these criteria. Nanofabrication leads to a large number of unstable charge traps on the material surface, close to the emitter. The unstable fields cause a Stark-shift in the NV energies, leading to inhomogeneous broadening of the NV zero-phonon-line (ZPL) and loss of indistinguishability. It was recently demonstrated that narrow (150 MHz) NVs can exist in nanopillars [1]. Here, we adapt and extend the developed methods and show NV centers with linewidths as low as 21 MHz, in a Sawfish photonic crystal cavity [2,3]. We also demonstrate the tuning of the cavity resonance, through N2 gas deposition, over 20 nm. We show initial indications of Purcell enhancement of the NV ZPL as the cavity is tuned through it.
[1] L. Orphal-Kobin et al., Phys. Rev. X 13, 011042 (2023).
[2] J. M. Bopp et al., Adv. Optical Mater. 12, 2301286 (2024).
[3] T. Pregnolato et al., APL Photonics 9(3), 036105 (2024).
Keywords: Nitrogen Vacancy Centers; Photonic Crystal Cavities; PLE spectroscopy; Photoluminescence enhancement; Tunable resonance