A Rack‐Integrated and Modular GaAs Quantum Dot Source of Highly Entangled Photon Pairs

ABSTRACT

Entangled photon pair sources are a key enabling technology for quantum communication and networking, yet their deployment beyond laboratory environments is hindered by system‐level complexity, limited operational stability, and insufficient industry compatibility. Here, we demonstrate a rack‐based, mobile quantum light source architecture based on a semiconductor quantum dot emitter that directly addresses these challenges through modular system integration and automated quantum state verification. The source generates polarization‐entangled photon pairs with an entanglement negativity of up to , confirming near‐maximal entanglement quality. In continuous, hands‐off operation over a 6 h time window, the system achieves an average combined exciton and biexciton single‐photon count rate of kHz and a maximum rate of kHz, while maintaining a of more than 95%. These results are enabled by the integration of optical excitation, collection, cryogenic operation, and control electronics within a standardized rack footprint, together with automated monitoring. By demonstrating simultaneously high entanglement quality, sustained brightness over a 6 h period, and inherent architectural robustness in an industry‐aligned system, this work advances semiconductor quantum dot devices toward deployable entangled photon sources for applied quantum photonics.