Controlled size reduction of rare earth doped nanoparticles for optical quantum technologies

Liu, Shuping; Serrano, Diana; Fossati, Alexandre; Tallaire, Alexandre; Ferrier, Alban; Goldner, Philippe

doi:10.1039/c8ra07246a

Cited by 19 publications

(34 citation statements)

References 49 publications

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“…These optical properties further establish RE 3+ :Y2O3 as a promising solid-state nanoscale platform. It corroborates recent results obtained with nanoparticles that included a long optical coherence time (T 2 > 10 μs) even for particles as small as 150 nm 21,22,61 and the possibility of all-optical coherent control of the spin levels of Eu 3+ ions with ms-long coherence times. 18 Future work will be dedicated to further harness the possibility of integrating ALD thin films into cavities to facilitate the manipulation of emitters at the single ion level.…”

Section: 56supporting

confidence: 91%

Ultrathin Eu- and Er-Doped Y₂O₃ Films with Optimized Optical Properties for Quantum Technologies

et al. 2019

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Atomic Layer Deposited (ALD) Y 2 O 3 thin films have been thoroughly investigated for optical or electronic applications. The coherent spectroscopy of lanthanide ions doped into this material has also recently attracted an increasing interest in the field of quantum technologies for which they are considered promising candidates in quantum memories or as spin-photon interface. However, these most demanding applications require a deep control over the local positioning of the ions and their close environment in the crystalline matrix. This study focuses on the structural as well as optical properties of Eu 3+ and Er 3+ dopants in Y 2 O 3 using photoluminescence (PL), luminescence decay times and inhomogeneous linewidth (Γ inh) measurements within this particular context. While as-grown ALD films do not provide an ideal host for the emitters we demonstrate that by optimizing the deposition conditions and using appropriate annealing post treatments, narrow inhomogeneous lines can be obtained for the 7 F 0 ↔ 5 D 0 transition of Eu 3+ even for nanoscale films. Furthermore, about 1.5 ms lifetime has been measured for the infrared telecom transition of Er in ultrathin films (< 10 nm) which is an order of magnitude higher than in nanoparticles of the same size. These results validate optimized rare-earth doped ALD Y 2 O 3 films as a suitable platform for photonics applications where few nm thick films with well localized emitters are mandatory. This approach provides the first building blocks towards the development of more complex devices for quantum sensing or hybrid structures coupled to other systems such as 2D materials. Rare earth (RE) oxides represent a technologically useful class of materials that can address a variety of applications such as photonics 1,2,3 , protective coatings 4,5 , laser media, catalysts 6

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Section: 56supporting

confidence: 91%

Ultrathin Eu- and Er-Doped Y₂O₃ Films with Optimized Optical Properties for Quantum Technologies

et al. 2019

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“…This line broadening is due to the post-synthesis O 2 plasma treatment. Indeed, similar behaviour is observed in Eu 3+ :Y 2 O 3 nanoparticles: bulk-like inhomogeneous lines are measured after synthesis [26] whereas a factor 2-3 line broadening is observed following O 2 plasma processing [25]. The processing also provokes a blueshift of about 10 GHz from 484.308 THz (λ vac =619.011 nm), as measured in the ceramic, to 484.317 THz.…”

Section: A Optical Inhomogeneous and Homogeneous Linewidthssupporting

confidence: 74%

Coherent optical and spin spectroscopy of nanoscale Pr3+:Y2O3

et al. 2019

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We investigate the potential for optical quantum technologies of Pr 3+ :Y2O3 in the form of monodisperse spherical nanoparticles. We measured optical inhomogeneous lines of 27 GHz, and optical homogeneous linewidths of 108 kHz and 315 kHz in particles of 400 nm and 150 nm average diameters respectively for the 1 D2(0)↔ 3 H4(0) transition at 1.4 K. Furthermore, ground state and 1 D2 excited state hyperfine structures in Y2O3 are here for the first time determined by spectral hole burning and modeled by complete Hamiltonian calculations. Ground-state spin transitions have energies of 5.99 MHz and 10.42 MHz for which we demonstrate spin inhomogeneous linewidths of 42 and 45 kHz respectively. Spin T2 up to 880 µs was obtained for the ±3/2 ↔ ±5/2 transition at 10.42 MHz, a value which exceeds that of bulk Pr 3+ doped crystals so far reported. These promising results confirm nanoscale Pr 3+ :Y2O3 as a very appealing candidate to integrate quantum devices. In particular, we discuss here the possibility of using this material for realizing spin photon interfaces emitting indistinguishable single photons.

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“…larger surface to volume ratio, impurities introduced by bottomup synthesis, or defects related to lower crystalline quality. Nevertheless, we were able to show that europium doped Y 2 O 3 nanoparticles can have optical coherence lifetimes as long as 10 µs at 1.3 K 16,17 , while nuclear spin T 2 can reach up to 8 ms at 5 K 18 . Similar values have been observed in Pr 3+ :Y 2 O 3 nanoparticles 19 .…”

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Defect Engineering for Quantum Grade Rare-Earth Nanocrystals

et al. 2020

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Nanostructured systems that combine optical and spin transitions offer new functionalities for quantum technologies by providing efficient quantum light-matter interfaces. Rare earth (RE) ions doped nanoparticles are promising in this field as they show long-lived optical and spin quantum states, a unique feature among nanomaterials. However, further development of their use in highly demanding applications such as scalable single ion based quantum processors, requires controlling defects that currently limit coherence lifetimes. In this work, we demonstrate that a novel posttreatment process that includes multi-step high-temperature annealing followed by high-power microwave oxygen plasma processing advantageously improves key properties for quantum technologies. We obtain single crystalline nanoparticles (NPs) of 100 nm diameter, presenting bulk-like inhomogeneous linewidths (Γ inh) and population lifetimes (T 1). Furthermore, a significant coherence lifetime (T 2) extension, up to a factor of 5, is successfully achieved by modifying the oxygen-related point defects in the NPs by the oxygen plasma treatment. These promising results confirm the potential of these engineered RE NPs to integrate devices such as cavity-based single photon sources, quantum memories and processors. In addition, our strategy could be applied to a large variety of oxides to obtain outstanding crystalline quality NPs for a broad range of applications.

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Controlled size reduction of rare earth doped nanoparticles for optical quantum technologies

Abstract: Chemical etching is a promising way to synthesize RE:Y2O3 nanoparticles with controlled size and long coherence lifetimes, opening the way to optical micro/nano-cavities coupling and efficient nanoscale quantum memories and processors.

Cited by 19 publications

References 49 publications

Ultrathin Eu- and Er-Doped Y₂O₃ Films with Optimized Optical Properties for Quantum Technologies

Ultrathin Eu- and Er-Doped Y₂O₃ Films with Optimized Optical Properties for Quantum Technologies

Coherent optical and spin spectroscopy of nanoscale Pr3+:Y2O3

Defect Engineering for Quantum Grade Rare-Earth Nanocrystals

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Controlled size reduction of rare earth doped nanoparticles for optical quantum technologies

Abstract: Chemical etching is a promising way to synthesize RE:Y2O3 nanoparticles with controlled size and long coherence lifetimes, opening the way to optical micro/nano-cavities coupling and efficient nanoscale quantum memories and processors.

Cited by 19 publications

References 49 publications

Ultrathin Eu- and Er-Doped Y2O3 Films with Optimized Optical Properties for Quantum Technologies

Ultrathin Eu- and Er-Doped Y2O3 Films with Optimized Optical Properties for Quantum Technologies

Coherent optical and spin spectroscopy of nanoscale Pr3+:Y2O3

Defect Engineering for Quantum Grade Rare-Earth Nanocrystals

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Product

Resources

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Ultrathin Eu- and Er-Doped Y₂O₃ Films with Optimized Optical Properties for Quantum Technologies

Ultrathin Eu- and Er-Doped Y₂O₃ Films with Optimized Optical Properties for Quantum Technologies