Entanglement robustness to excitonic spin precession in a quantum dot

Bounouar, S.; Rein, Gabriel; Barkemeyer, Kisa; Schleibner, Julian; Schnauber, Peter; Gschrey, Manuel; Schulze, Jan-Hindrik; Strittmatter, A.; Rodt, Sven; Knorr, Andreas; Carmele, Alexander; Reitzenstein, Stephan

doi:10.1103/physrevb.102.045304

Cited by 2 publications

(1 citation statement)

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“…For example, narrow spectral filtering of the biexciton and exciton photons can be applied to improve the fidelity of the entangled state. [53] Another related approach is based on temporal post-selection of the emitted photons, [54][55][56] which has demonstrated to achieve high entanglement fidelities. [57] However, it has to be emphasized that post-selection schemes inevitably induce severe photon-pair losses, hamper on-demand generation of entangled photons and, more in general, the real possibility of using QDs for applications.…”

Section: Fine Structure Splittingmentioning

confidence: 99%

Quantum dot technology for quantum repeaters: from entangled photon generation toward the integration with quantum memories

Neuwirth

Basset

Rota

et al. 2021

Mater. Quantum. Technol.

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The realization of a functional quantum repeater is one of the major research goals in long-distance quantum communication. Among the different approaches that are being followed, the one relying on quantum memories interfaced with deterministic quantum emitters is considered as one of the most promising solutions. In this work, we focus on the hardware to implement memory-based quantum-repeater schemes that rely on semiconductor quantum dots for the generation of polarization entangled photons. Going through the most relevant figures of merit related to efficiency of the photon source, we select significant developments in fabrication, processing and tuning techniques aimed at combining high degree of entanglement with on-demand pair generation, with a special focus on the progress achieved in the representative case of the GaAs system. We proceed to offer a perspective on integration with quantum memories, both highlighting preliminary works on natural-artificial atomic interfaces and commenting a wide choice of currently available and potentially viable memory solutions in terms of wavelength, bandwidth and noise-requirements. To complete the overview, we also present recent implementations of entanglement-based quantum communication protocols with quantum dots and highlight the next challenges ahead for the implementation of practical quantum networks.

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