EurekAlert August 12, 2024 Although progress has been reported in the generation of mutually entangled multi-photon quantum light states using free space apparatus, high-fidelity high-rate on-chip entanglement generation is important for future scalability. An international team of researchers (France, Italy, Brazil) used a bright quantum-dot based single-photon source to demonstrate the high-fidelity generation of 4-photon Greenberg-Horne-Zeilinger (GHZ) states with a low-loss reconfigurable glass photonic circuit. They reconstructed the density matrix of the generated states using full quantum-state tomography reaching an experimental fidelity and purity. The entanglement of the generated states was certified with a semi device-independent approach through the violation […]
Tag Archives: Photon entanglement
Researchers create entangled photons 100 times more efficiently than previously possible
Phys.org December 17, 2020 Current methods of creating entanglement are inefficient, requiring a torrent of incoming laser light comprising hundreds of millions of photons before a single entangled photon pair will grudgingly drip out at the other end. Based on their earlier research, researchers at the Stevens Institute of Technology carved extremely high-quality racetrack-shaped microcavities into flakes of lithium niobate crystal. The cavities internally reflect photons with very little loss of energy, enabling light to circulate longer and interact with greater efficiency. By fine-tuning additional factors such as temperature, the team was able to create an unprecedentedly bright source of […]