Optical coherence of Er${}^{3+}$:Y${}_2$O${}_3$ ceramics for telecommunication quantum technologies

Abstract

We report an optical homogeneous linewidth of 580 $\pm$ 20 Hz of Er${}^{3+}$:Y${}_2$O${}_3$ ceramics at millikelvin temperatures, narrowest so far in rare-earth doped ceramics. We show slow spectral diffusion of $\sim$2 kHz over a millisecond time scale. Temperature, field dependence of optical coherence and spectral diffusions reveal the remaining dephasing mechanism as elastic two-level systems in polycrystalline grain boundaries and superhyperfine interactions of Er${}^{3+}$ with nuclear spins. In addition, we perform spectral holeburning and measure up to 5 s hole lifetimes. These spectroscopic results put Er${}^{3+}$:Y${}_2$O${}_3$ ceramics as a promising candidate for telecommunication quantum memories and light-matter interfaces.

8 pages, 5 figures, 49 references

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• The Quantum Internet
• Quantum technologies with hybrid systems
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• Investigations of Optical Coherence Properties in an Erbium-doped Silicate Fiber for Quantum State Storage
• Optical decoherence and spectral diffusion in an erbium-doped silica glass fiber featuring long-lived spin sublevels
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• Spectral broadening of a single Er${}^{3+}$ ion in a Si nano-transistor
• Erbium Quantum Memory Platform with Long Optical Coherence via Back-End of Line Deposition on Foundry-Fabricated Photonics
• Deterministic relation between optical polarization and lattice symmetry revealed in ion-doped single microcrystals