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Phys Rev Lett. 2015 Jul 3;115(1):013601. Epub 2015 Jul 2.

Observation of Photon Echoes From Evanescently Coupled Rare-Earth Ions in a Planar Waveguide.

Author information

1
Laser Physics Centre, Australian National University, Canberra, Australian Capital Territory 2601, Australia.
2
Centre for Quantum Computation and Communication Technology, Laser Physics Centre, Australian National University, Canberra, Australian Capital Territory 2601, Australia.

Abstract

We report the measurement of the inhomogeneous linewidth, homogeneous linewidth, and spin-state lifetime of Pr3+ ions in a novel waveguide architecture. The TeO2 slab waveguide deposited on a bulk Pr3+∶Y2SiO5 crystal allows the 3H4↔1D2 transition of Pr3+ ions to be probed by the optical evanescent field that extends into the substrate. The 2-GHz inhomogeneous linewidth, the optical coherence time of 70±5  μs, and the spin-state lifetime of 9.8±0.3  s indicate that the properties of ions interacting with the waveguide mode are consistent with those of bulk ions. This result establishes the foundation for large, integrated, and high performance rare-earth-ion quantum systems based on a waveguide platform.

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