Two-photon interference from a quantum emitter in hexagonal boron nitride

Abstract

Recently discovered quantum emitters in two-dimensional (2D) materials have opened new perspectives of integrated photonic devices for quantum information. Most of these applications require the emitted photons to be indistinguishable, which has remained elusive in 2D materials. Here, we investigate two-photon interference of a quantum emitter generated in hexagonal boron nitride (hBN) using an electron beam. We measure the correlations of zero-phonon-line photons in a Hong-Ou-Mandel (HOM) interferometer under non-resonant excitation. We find that the emitted photons exhibit a partial indistinguishability of $0.44\pm 0.11$ in a 3 ns time window, which corresponds to a corrected value of $0.56\pm 0.11$ after accounting for imperfect emitter purity. The dependence of the HOM visibility on the width of the post-selection time window allows us to estimate the dephasing time of the emitter to be $\sim 1.5$ ns, about half the limit set by spontaneous emission. A visibility above 90 % is under reach using Purcell effect with up-to-date 2D material photonics.

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• Single-photon emitters in WSe${}_2$: Critical role of phonons on excitation schemes and indistinguishability
• Quantum efficiency and vertical position of quantum emitters in hBN determined by Purcell effect in hybrid metal-dielectric planar photonic structures
• Creation and Microscopic Origins of Single-Photon Emitters in Transition Metal Dichalcogenides and Hexagonal Boron Nitride
• Room temperature quantum emitters in van der Waals α-MoO3
• Many-Body Entanglement in Solid-State Emitters
• Perovskite Nanocrystals as Emerging Single-Photon Emitters: Progress, Challenges, and Opportunities
• Spin-photon Qubits for Scalable Quantum Network
• Deterministic generation of single B centers in hBN by one-to-one conversion from UV centers
• Photon correlation Fourier spectroscopy of a B center in hBN