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Two-photon interference with remote Lead-vacancy centers in diamond over 10 K

Peng Wang, 椋太郎 阿部, Ryotaro Abe, Sho Ikeda, Kakeru Ikeda, 太田英岐, Eiki Ota, Takashi Taniguchi, Mutsuko Hatano, Takayuki Iwasaki

Published Oct 1, 2024• 0 citations
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We demonstrate quantum interference between indistinguishable photons emitted by two nitrogen-vacancy centers in distinct diamond samples separated by two meters. Macroscopic solid immersion lenses are used to enhance photon collection efficiency. Quantum interference is verified by measuring a value of the second-order cross-correlation function g((2))(0)=0.35±0.04<0.5. In addition, optical transition frequencies of two separated nitrogen-vacancy centers are tuned into resonance with each other by applying external electric fields. An extension of the present approach to generate entanglement of remote solid-state qubits is discussed.