2022
DOI: 10.1021/acs.nanolett.2c01959
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Quantum Interference of Resonance Fluorescence from Germanium-Vacancy Color Centers in Diamond

Abstract: Resonance fluorescence from a quantum emitter is an ideal source to extract indistinguishable photons. By using the cross-polarization to suppress the laser scattering, we observed resonance fluorescence from GeV color centers in diamond at cryogenic temperature. The Fourier-transform-limited line width emission with T 2/2T 1 ∼ 0.86 allows for two-photon interference based on single GeV color center. Under pulsed excitation, the separated photons exhibit a Hong–Ou–Mandel quantum interference above classical li… Show more

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Cited by 19 publications
(13 citation statements)
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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%
See 1 more Smart Citation
“…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%
“…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%
“…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%