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Quantum information distribution over quantum networks is essential for the advancement of secure communication and distributed quantum computing. To achieve this, reliable and efficient sources of flying qubits are crucial. GaAs quantum dots are promising candidates due to their outstanding features [1, 2, 3]. However, these quantum dots often exhibit dissimilar emission properties, so that interfacing two distinct emitters is generally a significant challenge. We address this issue through state-of-the-art methods for the engineering of the emitters electronic structure and a high time-resolution detection system, that allow us to reach high indistinguishability and high entanglement at the same time. Thanks to these techniques, we successfully demonstrated the first all-photonic quantum teleportation between two separate quantum dots over a fiber and free-space quantum network laid over the Sapienza University campus. This achievement illustrates the potential of engineered quantum dots for the realization of quantum relays and quantum repeaters and paves the way for the implementation of practical quantum networks.
[1] Huber, D. et al. Highly indistinguishable and strongly entangled photons from symmetric GaAs quantum dots. Nature communications 8, 15506 (2017)
[2] Schöll, E. et al. Resonance fluorescence of GaAs quantum dots with near-unity photon indistinguishability. Nano Letters 19, 2404–2410 (2019)
[3] Schweickert, L. et al. On-demand generation of background-free single photons from a solid-state source. Applied Physics Letters 112 (2018)
