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New Record Set for Symmetric Single-Mode Single-Photon Heralding Efficiency

The JQI/PFC experiment achieves a groundbreaking 84% heralding efficiency for entangled photons produced via parametric downconversion. By successfully detecting one photon (A) and its entangled partner (B) simultaneously in separate detectors, the study optimizes the heralding process without testing Bell criteria. This result surpasses the 82% threshold theorized to close entanglement loopholes and has significant implications for quantum experiments, random number generation, and the reliability of single-photon sources.

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New Record Set for Symmetric Single-Mode Single-Photon Heralding Efficiency

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  1. New Record for Photon Heralding A JQI/PFC experiment establishes a new record for symmetric single-mode, single-photon, heralding efficiency for a pair of entangled photons produced during parametric downconversion. About 84% of the time they observe photon A in one detector they also observe photon B just where it should be in a second detector, and vice versa. The aim of the JQI experiment is not itself to test the Bell criteria for entanglement (as it turns out the polarizations of photons A and B are known beforehand) but rather to optimize the process of heralding---the ability to say that if A is here then B is there. Some theorists hold that the heralding efficiency must be at least 82% if entanglement loopholes are to be closed. The JQI result has exceeded this criterion. The JQI detection scheme will be useful for a number of reasons: it should help experiments to tighten remaining loopholes over the fundamental sway of quantum reality; with the use of a shutter, it should help to establish a reliable source of single photons; and it might be an ingredient in the creation of a source of random numbers. Light produced in the process of spontaneous parametric down conversion. (Illustration credit: NIST). “Demonstrating highly symmetric single-mode, single-photon heralding efficiency in spontaneous parametric downconversion,” Marcelo Da Cunha Pereira, Francisco E Becerra, Boris L Glebov, Jingyun Fan, Sae Woo Nam, and Alan Migdall, Optics Letters, May 15, 2013.

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