Nanowerk September 12, 2023
Bell-state projections serve as a fundamental basis for most quantum communication and computing protocols today. However, with current Bell-state measurement schemes based on linear optics, only two of four Bell states can be identified, which means that the maximum success probability of this vital step cannot exceed 50%. Researchers in Germany experimentally demonstrated a scheme that amended the original measurement with additional modes in the form of ancillary photons, which led to a more complex measurement pattern, and ultimately a higher success probability of 62.5%. Experimentally, they achieved a success probability of (57.9 ± 1.4)%, a substantial improvement over the conventional scheme. According to the researchers their work paves the way toward more efficient realizations of quantum technologies based on Bell-state measurements… read more. Open Access TECHNICAL ARTICLEÂ
Schematics of the standard and enhanced BSM and the corresponding detection-probability distributions. Credit: SCIENCE ADVANCES, 9 Aug 2023,Vol 9, Issue 32