Quantum Interference of Resonance Fluorescence from Germanium-Vacancy Color Centers in Diamond

Chen, Disheng; Froech, Johannes; Ru, Shihao; Cai, Haiwen; Wang, Naizhou; Adamo, Giorgio; Scott, John; Li, Fuli; Zheludev, Nikolay I.; Aharonovich, Igor; Gao, Weibo

doi:10.1021/acs.nanolett.2c01959

Cited by 19 publications

(13 citation statements)

References 45 publications

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“…The four distinctive peaks indicate the four well-known optical transitions of the GeV center at ∼601–603 nm, which are labeled A, B, C, and D (Figure a, inset) . Note that in the measurement, each peak shows inhomogeneous broadening due to the presence of several GeV centers in the same nanodiamond . The broadening is however too small to be discriminated by our spectrometer equipped with a 1800 g/mm grating (∼0.035 nm resolution).…”

Section: Resultsmentioning

confidence: 91%

“…As a result, its ZPL is spectrally stable, making this color center an ideal choice for our demonstration. Furthermore, the ZPL accounts for ∼70% of the total fluorescence of the center, which is desirable for several applications in quantum optics and nanophotonics. − To characterize the optical response of the GeV centers, we loaded the sample into a commercial closed-cycle helium gas cryo-refrigerator (cf. Methods) with an optically accessible window.…”

Section: Resultsmentioning

confidence: 99%

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Ultralow-Power Cryogenic Thermometry Based on Optical-Transition Broadening of a Two-Level System in Diamond

et al. 2023

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Cryogenic temperatures are the prerequisite for many advanced scientific applications and technologies. The accurate determination of temperature in this range and at the submicrometer scale is, however, nontrivial. This is due to the fact that temperature reading in cryogenic conditions can be inaccurate due to optically induced heating. Here, we present an ultralowpower, optical thermometry technique that operates at cryogenic temperatures. The technique exploits the temperature-dependent linewidth broadening measured by resonant photoluminescence of a two-level system: a germanium-vacancy color center in a nanodiamond host. The proposed technique achieves a relative sensitivity of ∼20% K −1 , at 5 K. This is higher than any other alloptical nanothermometry method. Additionally, it achieves such sensitivities while employing excitation powers of just a few tens of nanowatts, several orders of magnitude lower than other traditional optical thermometry protocols. To showcase the performance of the method, we demonstrate its ability to accurately read out local differences in temperatures at various target locations of a custom-made microcircuit. Our work is a step toward the advancement of nanoscale optical thermometry at cryogenic temperatures.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Ultralow-Power Cryogenic Thermometry Based on Optical-Transition Broadening of a Two-Level System in Diamond

et al. 2023

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“…For example, many currently used crystals limit quantum device performance through the presence of abundant nuclear spins. In yttrium-based hosts, such as Y 2 SiO 5 , 89 Y has a 1/2 nuclear spin with 100% abundance and the magnetic noise caused by this spin bath can ultimately limit coherence lifetimes, especially for electron spins. This problem is even worse in hosts like YVO 4 or LiNbO 3 , which contain nuclear spins with large magnetic moments.…”

Section: Current and Future Challengesmentioning

confidence: 99%

2023 roadmap for materials for quantum technologies

Becher

Gao

Kar

et al. 2023

Mater. Quantum. Technol.

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Quantum technologies are poised to move the foundational principles of quantum physics to the forefront of applications. This roadmap identifies some of the key challenges and provides insights on materials innovations underlying a range of exciting quantum technology frontiers. Over the past decades, hardware platforms enabling different quantum technologies have reached varying levels of maturity. This has allowed for first proof-of-principle demonstrations of quantum supremacy, for example quantum computers surpassing their classical counterparts, quantum communication with reliable security guaranteed by laws of quantum mechanics, and quantum sensors uniting the advantages of high sensitivity, high spatial resolution, and small footprints. In all cases, however, advancing these technologies to the next level of applications in relevant environments requires further development and innovations in the underlying materials. From a wealth of hardware platforms, we select representative and promising material systems in currently investigated quantum technologies. These include both the inherent quantum bit systems as well as materials playing supportive or enabling roles, and cover trapped ions, neutral atom arrays, rare earth ion systems, donors in silicon, color centers and defects in wide-band gap materials, two-dimensional materials and superconducting materials for single-photon detectors. Advancing these materials frontiers will require innovations from a diverse community of scientific expertise, and hence this roadmap will be of interest to a broad spectrum of disciplines.

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“…At the time of writing, the current state-of-the-art experiment using NV centers achieved an entanglement rate of ∼ 10 Hz [48], [49], limited by the long radiative lifetime (τ ≃ 12 ns), the aforementioned small branching into the ZPL (Debye-Waller factor of ∼ 3 %) and poor photon extraction efficiency owing to total internal reflection. While the group-IV defect centers possess more favorable optical properties in terms of a larger Debye-Waller factor and shorter radiative lifetime, to date, no experiments demonstrating remote entanglement have been conducted, though recently indistinguishable photons from GeV [257] and SnV color centers were reported [258].…”

Section: B Engineering Of the Photonic Environmentmentioning

confidence: 99%

Diamond Integrated Quantum Nanophotonics: Spins, Photons and Phonons

Shandilya

Flågan

Carvalho

et al. 2022

J. Lightwave Technol.

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Integrated quantum photonics devices in diamond have tremendous potential for many quantum applications, including long-distance quantum communication, quantum information processing, and quantum sensing. These devices benefit from diamond's combination of exceptional thermal, optical, and mechanical properties. Its wide electronic bandgap makes diamond an ideal host for a variety of optical active spin qubits that are key building blocks for quantum technologies. In landmark experiments, diamond spin qubits have enabled demonstrations of remote entanglement, memory-enhanced quantum communication, and multi-qubit spin registers with fault-tolerant quantum error correction, leading to the realization of multinode quantum networks. These advancements put diamond at the forefront of solid-state material platforms for quantum information processing. Recent developments in diamond nanofabrication techniques provide a promising route to further scaling of these landmark experiments towards real-life quantum technologies. In this paper, we focus on the recent progress in creating integrated diamond quantum photonic devices, with particular emphasis on spin-photon interfaces, cavity optomechanical devices, and spin-phonon transduction. Finally, we discuss prospects and remaining challenges for the use of diamond in scalable quantum technologies.

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Quantum Interference of Resonance Fluorescence from Germanium-Vacancy Color Centers in Diamond

Cited by 19 publications

References 45 publications

Ultralow-Power Cryogenic Thermometry Based on Optical-Transition Broadening of a Two-Level System in Diamond

Ultralow-Power Cryogenic Thermometry Based on Optical-Transition Broadening of a Two-Level System in Diamond

2023 roadmap for materials for quantum technologies

Diamond Integrated Quantum Nanophotonics: Spins, Photons and Phonons

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