Cavity-enhanced quantum network nodes

Reiserer, Andreas

doi:10.48550/arxiv.2205.15380

Cited by 1 publication

(3 citation statements)

References 253 publications

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“…The narrow homogeneous linewidth, slow spectral diffusion, and high photon generation efficiency of our setup should enable the entanglement of dopants over tens of kilometers of optical fiber via photon interference (5) or other, cavity-based protocols that can be less sensitive to slowly fluctuating emitter detuning (25). The achieved Purcell enhancement reduces the optical lifetime to ≲0.5 ms.…”

Section: Discussionmentioning

confidence: 98%

“…This may be further reduced using silicon (33,34) or other (36) host crystals and using Fabry-Perot resonators with higher finesse and smaller mode waist (45,46). Combining the two, Fourier-limited spectral diffusion linewidth should be achievable, eliminating the need for fast resonance frequency measurements common in solid-state quantum network nodes (5,25). Last, our setup may allow further steps toward distributed quantum information processing with all-to-all connectivity in a rare earth-based quantum computer (8).…”

Section: Discussionmentioning

confidence: 99%

“…Among all investigated photon emitters that host long-lived qubits (24,25), erbium is the only one that exhibits a coherent (26) optical transition in the minimal-loss band of fiber-optical telecommunication, around 1536 nm. Together with the demonstrated second-long ground-state coherence in high magnetic fields (27), this is a unique advantage toward the realization of global quantum networks.…”

Section: Introductionmentioning

confidence: 99%

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Spectral multiplexing of telecom emitters with stable transition frequency

2022

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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 megahertz 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) milliseconds, approaching the lifetime limit of 0.3 milliseconds for the strongest-coupled emitters. Our results constitute an important step toward frequency-multiplexed quantum-network nodes operating directly at a telecommunication wavelength.

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Section: Discussionmentioning

confidence: 98%