Quantum repeaters are crucial for extending the limits of fiber-based quantum communication. We focus on quantum-dot molecules (QDMs) as spin-photon interfaces and a promising platform for this technology. Using a fully quantum-mechanical master-equation formalism, we simulate protocol sequences considering the semiconductor material properties of QDMs [Schall et al., Adv. Quant. Technol. 4.6, 2100002 (2021)] and time-dependent electric fields for gate operations. Our findings indicate that typical QDMs, with currently attainable switching speeds, operate near the adiabatic regime, enabling high-fidelity gate operations. Our approach enables the estimation of transfer rates and predicts fabrication parameters for semiconductor QMDs.
Multi-partite entanglement is a key resource for many applications in quantum information technologies. Based on two material platforms, we consider methods for entanglement generation. In quantum-dot molecules [1], electric-field switching is used, and we characterize the separation between adiabatic and diabatic dynamics in the realization of entangled target states. Our numerical simulations are based on the Bloch-Redfield formalism and are a key step towards the realization of fully quantum-mechanical protocol simulation. As a second platform, we demonstrate the realization of multi-partite entangled states in coupled-cavity arrays and discuss their role in novel quantum machine learning concepts like quantum reservoir computing, to which we provide some insight.
[1] Schall et al., Advanced Quantum Technologies 4, 2100002 (2021).
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