Wavelength-tunable high-fidelity entangled photon sources enabled by dual Stark effects
arxiv(2023)
摘要
The construction of a large-scale quantum internet requires quantum repeaters
containing multiple entangled photon sources with identical wavelengths.
Semiconductor quantum dots can generate entangled photon pairs
deterministically with high fidelity. However, realizing wavelength-matched
quantum-dot entangled photon sources faces two difficulties: the non-uniformity
of emission wavelength and exciton fine-structure splitting induced fidelity
reduction. Typically, these two factors are not independently tunable, making
it challenging to achieve simultaneous improvement. In this work, we
demonstrate wavelength-tunable entangled photon sources based on droplet-etched
GaAs quantum dots through the combined use of AC and quantum-confined Stark
effects. The emission wavelength can be tuned by 1 meV while preserving an
entanglement fidelity f exceeding 0.955(1) in the entire tuning range. Based on
this hybrid tuning scheme, we finally demonstrate multiple wavelength-matched
entangled photon sources with f>0.919(3), paving a way towards robust and
scalable on-demand entangled photon sources for quantum internet and integrated
quantum optical circuits.
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