Detection of single ions in a nanoparticle coupled to a fiber cavity

  • Deshmukh C
  • Beattie E
  • Casabone B
  • et al.
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Abstract

Many quantum information protocols require the storage and manipulation of information over long times, and its exchange between nodes of a quantum network across long distances. Implementing these protocols requires an advanced quantum hardware, featuring, for example, a register of long-lived and interacting qubits with an efficient optical interface in the telecommunication band. Here we present the Purcell-enhanced detection of single solid-state ions in erbium-doped nanoparticles placed in a fiber cavity, emitting photons at 1536 nm. The open-access design of the cavity allows for complete tunability in both space and frequency, selecting individual particles and ions. The ions are confined in a volume two orders of magnitude smaller than in previous realizations, increasing the probability of finding ions separated by only a few nanometers, which could then interact. We report the detection of individual spectral features presenting saturation of the emission count rate and linewidth, as expected for two-level systems. We also report an uncorrected g (2) (0) of 0.24(5) for the emitted field, confirming the presence of a single emitter. Our fully fiber-integrated system is an important step towards the realization of the initially envisioned quantum hardware.

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Deshmukh, C., Beattie, E., Casabone, B., Grandi, S., Serrano, D., Ferrier, A., … de Riedmatten, H. (2023). Detection of single ions in a nanoparticle coupled to a fiber cavity. Optica, 10(10), 1339. https://doi.org/10.1364/optica.491692

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