On-demand generation of entangled photon pairs in the telecom C-band for fiber-based quantum networks

Abstract

On-demand sources of entangled photons for the transmission of quantum information in the telecom C-band are required to realize fiber-based quantum networks. So far, non-deterministic sources of quantum states of light were used for long distance entanglement distribution in this lowest loss wavelength range. However, they are fundamentally limited in either efficiency or security due to their Poissonian emission statistics. Here, we show on-demand generation of entangled photon pairs in the telecom C-band by an InAs/GaAs semiconductor quantum dot. Using a robust phonon-assisted excitation scheme we measure a concurrence of $91.4\%$ and a fidelity of $95.2\%$ to ${\Phi }^{+}$. On-demand generation of polarization entangled photons will enable secure quantum communication in fiber-based networks. Furthermore, applying this excitation scheme to several remote quantum dots tuned into resonance will enable first on-demand entanglement distribution over large distances for scalable real-life quantum applications.

arXiv comment10 pages, 4 figures

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Cited by in corpus (3)

• Bright Quantum Dot Single-Photon Emitters at Telecom Bands Heterogeneously Integrated on Si
• Droplet epitaxy symmetric InAs/InP quantum dots for quantum emission in the third telecom window: morphology, optical and electronic properties
• Quantum dots as potential sources of strongly entangled photons for quantum networks