Detector annealing results from the Space Entanglement and Annealing QUantum Experiment (SEAQUE)

A future quantum network will enable a range of applications, including connecting quantum computers, advancing quantum sensing schemes, supporting quantum key distribution, and testing fundamental aspects of quantum mechanics over large distances and varying gravitational potentials. For long-distance quantum networking, space-based nodes are preferable to fiber-based systems due to the inherent losses in optical fibers. The Space Entanglement and Annealing QUantum Experiment (SEAQUE) is the first U.S.-led quantum space demonstration, paving the way toward the development of such a network. SEAQUE is a polarization entanglement source housed in a 6U payload that was launched to the International Space Station (ISS) in November 2024, where it is mounted externally. The mission demonstrates a compact, robust, and high-fidelity source via CHSH Bell inequality violations and quantum state tomographies. Additionally, SEAQUE is testing thermal and laser annealing techniques on Single-Photon Avalanche Photodiodes (SPADs) to mitigate radiation damage. New annealing results will be presented.