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

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 both in 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 only by 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 $g^{(2)}\left(0\right)$ 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.

References in corpus (17)

• A bright and fast source of coherent single photons
• Fiber Fabry-Perot cavity with high finesse
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• Telecom-heralded entanglement between remote multimode solid-state quantum memories
• Entangling single atoms over 33 km telecom fibre
• Heralded entanglement distribution between two absorptive quantum memories
• Indistinguishable telecom band photons from a single erbium ion in the solid state
• Parallel single-shot measurement and coherent control of solid-state spins below the diffraction limit
• Storage of photonic time-bin qubits for up to 20 ms in a rare-earth doped crystal
• Cavity-enhanced single photon source based on the silicon vacancy center in diamond
• Dynamic control of Purcell enhanced emission of erbium ions in nanoparticles
• Coherent and Purcell-enhanced emission from erbium dopants in a cryogenic high-Q resonator
• Spectral multiplexing of telecom emitters with stable transition frequency
• Dynamical decoupling of spin ensembles with strong anisotropic interactions
• Coherent control of a nuclear spin via interactions with a rare-earth ion in the solid-state
• High connectivity quantum processor nodes using single-ion-qubits in rare-earth-ion-doped crystals
• Optical coherence properties of Kramers' rare-earth ions at the nanoscale for quantum applications

Cited by in corpus (7)

• Spectral Multiplexing of Rare-earth Emitters in a Co-doped Crystalline Membrane
• Quantum networks using rare-earth ions
• Spectral stability of cavity-enhanced single-photon emitters in silicon
• Multimodal Purcell enhancement and optical coherence of Eu${}^{\text{3+}}$ ions in a single nanoparticle coupled to a microcavity
• Compatibility of trapped ions and dielectrics at cryogenic temperatures
• Purcell Enhancement and Suppression in Laser Cooling of Yb${}^{3+}$:YLF Nanocrystals in a Fabry-Pérot Microcavity
• Incoherent Measurement of Sub-10 kHz Optical Linewidths