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The construction of a large-scale quantum internet requires quantum repeaterscontaining multiple entangled photon sources with identical wavelengths.Semiconductor quantum dots can generate entangled photon pairsdeterministically with high fidelity. However, realizing quantum dot-basedquantum repeaters faces two difficulties: the non-uniformity of emissionwavelength and exciton fine-structure splitting induced fidelity reduction.Typically, these two factors are not independently tunable, making itchallenging to achieve simultaneous improvement. In this work, we demonstratewavelength-tunable entangled photon sources based on droplet-etched GaAsquantum dots through the combined use of the AC and quantum-confined Starkeffects. The emission wavelength can be tuned by ~1 meV while preservingentanglement fidelity above 0.955(1) across the entire tuning range. Our workpaves a way towards robust and scalable on-demand entangled photon sources forlarge-scale quantum internet and integrated quantum optical circuits.

Wavelength-tunable high-fidelity entangled photon sources enabled by dual Stark effects