Quantum interference of single photons from remote nitrogen-vacancy centers in diamond

Details Quantum interference of single photons from remote nitrogen-vacancy centers in diamond Quantum interference of single photons from remote nitrogen-vacancy centers in diamond

2011-12-16

arxiv.org/abs/1112.3975v2

Phys. Rev. Lett. 108, 143601 (2012)

Physics

Quantum Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.108.143601

We demonstrate quantum interference between indistinguishable photons emitted by two nitrogen-vacancy (NV) 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 $g^{(2)}(0) = 0.35 \pm 0.04<0.5$. In addition, optical transition frequencies of two separated NV centers are tuned into resonance with each other by applying external electric fields. Extension of the present approach to generate entanglement of remote solid-state qubits is discussed.

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