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Quantum teleportation, the process where the state of a quantum particle, or qubit, is transferred from one place to another without moving the particle itself, typically relies on entanglement between an additional pair of qubits. Ideally, this transfer should occur flawlessly, but real-world conditions introduce noise that can degrade teleportation quality.
Researchers at the University by Robert Schreiber
Berlin, Germany (SPX) May 03, 2024
Quantum teleportation, the process where the state of a quantum particle, or qubit, is transferred from one place to another without moving the particle itself, typically relies on entanglement between an additional pair of qubits. Ideally, this transfer should occur flawlessly, but real-world conditions introduce noise that can degrade teleportation quality.
Researchers at the University of Turku in Finland and the University of Science and Technology of China in Hefei have proposed and tested a novel method to counteract these disturbances. They discovered that introducing noise can actually enhance the quality of teleportation when using a new kind of entanglement involving different physical properties of qubits.
"The work is based on an idea of distributing entanglement - prior to running the teleportation protocol - beyond the used qubits, i.e., exploiting the hybrid entanglement between different physical degrees of freedom", says Professor Jyrki Piilo from the University of Turku.
"This allows for a significant change in how the noise influences the protocol, and as a matter of fact our discovery reverses the role of the noise from being harmful to being beneficial to teleportation", Piilo describes.
Traditional approaches fail under noisy conditions or when using only hybrid entanglement without additional noise. However, the team's experiments showed that the right type of noise, when combined with hybrid entanglement, allows for near-perfect quantum state transfer.
"However, when we have hybrid entanglement and add noise, the teleportation and quantum state transfer occur in almost perfect manner", says Dr Olli Siltanen whose doctoral dissertation presented the theoretical part of the current research.
The research team's success in these complex teleportation experiments offers new insights into protecting quantum information against environmental interference and could be applied to other quantum technologies.
"This is a significant proof-of-principle experiment in the context of one of the most important quantum protocols", says Professor Chuan-Feng Li from the University of Science and Technology of China, Hefei.
The implications of this research are profound, as it not only supports the robustness of quantum teleportation against noise but also opens up new avenues for enhancing other quantum protocols.
Research Report:Overcoming noise in quantum teleportation with multipartite hybrid entanglement
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