Quantum Interference of Resonance Fluorescence from Germanium-Vacancy Color Centers in Diamond.
basic_science · Level V
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- Record sourced from PubMed, PMID 35913802.
- Also identified by DOI 10.1021/acs.nanolett.2c01959.
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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 <i>T</i><sub>2</sub>/2<i>T</i><sub>1</sub> ∼ 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 limit, whereas the continuous-wave excitation leads to a coalescence time window of 1.05 radiative lifetime. In addition, we demonstrated a single-shot readout of spin states with a fidelity of 74%. Our experiments lay down the foundation for building a quantum network with GeV color centers in diamond.