2018/04/30 by Huan Chen, H. Chen, S. Auchter +21
Computer Science · Physics and Astronomy · #Density matrix #Mechanical and Optical Resonators #Photon #Photon entanglement #Quantum #Quantum Information and Cryptography #Quantum entanglement #Quantum optics #Quantum optics and atomic interactions #Single-photon source #Spontaneous parametric down-conversion #Wavelength #quant-ph
paper · pdf · doi:10.1063/1.5038186
published as APL Photonics 3, 080804 (2018) · 8 pages, 6 figures
arxiv created 2018/04/30 · openalex created_date 2018/05/07 · openalex publication_date 2018/08/01 · arxiv updated 2018/08/21 · openalex updated_date 2026/08/05
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(1.8)% and a fidelity of 94.2(9)% with respect to a Bell state.