SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 57: Quantum Networks II (joint session QI/Q)
Q 57.3: Talk
Thursday, March 9, 2023, 15:00–15:15, F428
Towards remote entanglement of single erbium dopants — •Alexander Ulanowski1, Fabian Salamon1, Benjamin Merkel1, and Andreas Reiserer1,2 — 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 2TU München and Munich Center for Quantum Science and Technology, 85748 Garching, Germany
In a future quantum internet, coherent emitters will exchange quantum states over global distances, preferably using optical fibers to establish entanglement between remote spins. To this end, erbium dopants are a promising platform due to the optical transition in the telecom band enabling low-loss distribution of photons. To realize an efficient spin-photon interface for single dopants, we embed a thin erbium doped crystal into a tuneable high-finesse Fabry-Perot resonator. In our experiment we achieve up to 110-fold Purcell enhancement while the coherence is preserved up to the lifetime limit by avoiding proximal interfaces [1]. Using spectral multiplexing gives us access to hundreds of individual dopants which exhibit a low spectral diffusion (< 0.2 MHz) currently limited by the nuclear spin bath [2]. To further improve the spectral stability and enable entanglement generation via photon interference, we thus investigate spin-free 29Si crystals as a possible host material [3]. Furthermore, we expect considerable stability improvement by applying real-time feedback on the emitter frequency. This opens perspectives for long-distance entanglement at kilohertz rates.
[1] B. Merkel et al., Phys. Rev. X 10, 041025 (2020).
[2] A. Ulanowski et al., Sci. Adv. 8, eabo4538 (2022).
[3] Y. Liu et al., Journ. Cryst. Growth, 126733 (2022).