Spectral multiplexing of telecom emitters with stable transition frequency

Abstract

In a quantum network, coherent emitters can be entangled over large distances using photonic channels. In solid-state devices, the required efficient light-emitter interface can be implemented by confining the light in nanophotonic structures. However, fluctuating charges and magnetic moments at the nearby interface then lead to spectral instability of the emitters. Here we avoid this limitation when enhancing the photon emission up to 70(12)-fold using a Fabry-Perot resonator with an embedded 19 micrometer thin crystalline membrane, in which we observe around 100 individual erbium emitters. In long-term measurements, they exhibit an exceptional spectral stability of < 0.2 MHz that is limited by the coupling to surrounding nuclear spins. We further implement spectrally multiplexed coherent control and find an optical coherence time of 0.11(1) ms, approaching the lifetime limit of 0.3 ms for the strongest-coupled emitters. Our results constitute an important step towards frequency-multiplexed quantum-network nodes operating directly at a telecommunication wavelength.

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• A perspective on the pathway to a scalable quantum internet using rare-earth ions
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• Spectral Multiplexing of Rare-earth Emitters in a Co-doped Crystalline Membrane
• Characterization of the spin and crystal field Hamiltonian of erbium dopants in silicon
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• Erbium-implanted WS2 flakes with room-temperature photon emission at telecom wavelengths
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• Multimodal Purcell enhancement and optical coherence of Eu${}^{\text{3+}}$ ions in a single nanoparticle coupled to a microcavity
• Incoherent Measurement of Sub-10 kHz Optical Linewidths