A single-photon detector and counting module (SPODECT) recently designed and built by Waterloo’s Quantum Photonics Lab for the International Space Station (ISS) will be used to verify quantum entanglement and test its survivability in space as part of the Space Entanglement and Annealing QUantum Experiment (SEAQUE) mission, in collaboration with researchers at the University of Illinois Urbana-Champaign, the Jet Propulsion Laboratory, ADVR Inc, and the National University of Singapore.
Serving as a continuation of the Cool Annealing Payload Satellite (CAPSat) project that intended to perform in-orbit measurements and annealing of silicon single-photon detectors, SEAQUE is the first ever space-based quantum experiment that integrates a source of entangled photon pairs using an optical waveguide crystal, which offers a higher photon pair production efficiency than regular bulk crystals. SEAQUE’s pioneering design will also use a bright laser to regularly heal damage resulting from radiation exposure in between rounds of detecting photons generated from the entanglement source. This process, known as optical annealing, will help mitigate the increase of radiation-induced detector noise without the method of extreme cooling as used previously.
“This new detector module design is a step towards building a quantum communication technology at lower cost and lower complexity systems than conventional designs,” said Krynski. “Our experiment will determine the viability of this new approach and whether it can be useful for future quantum information satellite networks.”
“The SEAQUE mission will demonstrate a novel and efficient photon pair source, a custom single-photon detector system, which could be a part of future quantum entanglement network nodes in space,” said Jennewein. "The main benefit of his space-based entanglement distribution will be that it enables quantum networking at much greater distances than purely ground-based architecture, as the space borne signals avoid the limitations of obstacles or absorptive media.”
SEAQUE is planned to launch early next year on NG-19, arriving at the ISS to reside in the Bishop Airlock. View the recording of CAPSAT’s launch from October 2021.
The Waterloo team acknowledges funding support by the Canadian Space Agency (FAST program).