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Researchers at TU Wien have theoretically demonstrated that reversing a photon's temporal pulse shape using engineered optical waveguides could eliminate transfer losses in quantum communication. This approach addresses the fundamental mismatch between standard emission profiles and qubit absorption requirements, potentially raising success rates from approximately 54 percent to near 100 percent. By leveraging time-reversible quantum dynamics, this method offers a significant pathway toward reliable long-distance quantum networking.

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TU Wien reverses photon pulse shape for reliable qubit transfer

Quantum ZeitgeistSeptember 14, 20263 min read

Photons carry quantum information, but the transfer does not always succeed—conventional methods achieve a success rate of at most around 54 percent. Researchers at TU Wien have now shown how tailoring a photon’s pulse shape, by reversing it, can dramatically increase the success rate.

© Oliver Diekmann / TU Wien · tuwien.at Researchers at TU Wien have devised a method to reverse the shape of a photon’s pulse, potentially solving a critical bottleneck in quantum communication. Current photon transfer methods achieve a maximum success rate of around 54 percent, meaning nearly half of quantum transmissions fail to deliver information. Dr. Zeyu Kuang from the Institute of…

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