High-concurrence time-bin entangled photon pairs from optimized Bragg-reflection waveguides

Abstract

Semiconductor Bragg-reflection waveguides are well-established sources of correlated photon pairs as well as promising candidates for building up integrated quantum optics devices. Here, we use such a source with optimized non-linearity for preparing time-bin entangled photons in the telecommunication wavelength range. By taking advantage of pulsed state preparation and efficient free-running single-photon detection, we drive our source at low pump powers, which results in a strong photon-pair correlation. The tomographic reconstruction of the state's density matrix reveals that our source exhibits a high degree of entanglement. We extract a concurrence of $88.9\pm 1.8\%$ and a fidelity of $94.2\pm 0.9\%$ with respect to a Bell state.

8 pages, 6 figures

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• Understanding photoluminescence in semiconductor Bragg-reflection waveguides: Towards an integrated, GHz-rate telecom photon pair source
• Optimizing the spectro-temporal properties of photon pairs from Bragg-reflection waveguides
• Photon-number parity of heralded single photons from a Bragg-reflection waveguide reconstructed loss-tolerantly via moment generating function
• Time-bin encoded quantum key distribution over 120 km with a telecom quantum dot source
• Unfolding the Hong-Ou-Mandel interference between heralded photons from narrowband twin beams
• Photonic quantum information with time-bins: Principles and applications