A viable quantum internet (a network that shares information stored in qubits over long distances through entanglement) will change the fields of data storage, precise sensing and computing, thus ushering in a new era of communication.
This month, scientists at the Fermi National Accelerator Laboratory (U.S. Department of Energy National Laboratory at the University of Chicago) and partners from five institutions took an important step towards the realization of the quantum internet.
In a paper published on PRX Quantum, the team demonstrated for the first time the continuous, long-distance transmission of qubits composed of photons (light particles) with a fidelity greater than 90%.
Using the most advanced single-photon detectors and off-the-shelf equipment, these qubits are transmitted through a 27-mile (44 kilometers) optical fiber network.
“We are very excited about these results,” said Fermilab’s scientist Panagiotis Spanzoris, one of the co-authors of the paper, and one of the co-authors of the Fermilab’s Quantum Science Program. “This is an establishment. This is a key achievement in a technological approach that will redefine the way we communicate globally.”
This achievement came just a few months after the U.S. Department of Energy announced its blueprint for the national quantum internet at a press conference at the University of Chicago.
Quantum teleportation is the “invisible” transfer of a quantum state from one location to another. Quantum teleportation of qubits is achieved using quantum entanglement, in which two or more particles are inseparable from each other. If two separate locations share an entangled particle pair, the encoded information will be transmitted regardless of the distance between them.
The joint team-researchers from Fermilab, AT&T, California Institute of Technology, Harvard University, NASA Jet Propulsion Laboratory, and University of Calgary-successfully delivered qubits on two systems: Caltech Quantum Network and Fermilab Quantum Network. These systems are designed, built, debugged and deployed by Caltech’s public-private research program on Intelligent Quantum Networks and Technology or IN-Q-NET.
Maria Spiropulu, Professor of the Department of Physics at the Business School of California Institute of Technology and Director of the IN-Q-NET Research Program, said: “We are committed to achieving sustainable, high-performance and scalable quantum teleportation systems. I am very proud of this milestone.”. “With the system upgrade that we expect to be completed in the second quarter of 2021, the results will be further improved.”
Both Caltech and Fermilab networks with nearly autonomous data processing functions are compatible with existing telecommunications infrastructure and emerging quantum processing and storage devices. Researchers are using them to increase the fidelity and rate of entanglement distribution, with a focus on complex quantum communication protocols and basic science.
Sponzoulis said: “Through this demonstration, we will begin to lay the foundation for the construction of the urban quantum network in the Chicago area.”
The Philadelphia Lab worked with Argonne National Laboratory, California Institute of Technology, Northwestern University, and industry partners to design the Chicago network called Illinois Express Quantum Network.
Joe Lykken, deputy director of Fermilab’s research department, said: “This feat is a testament to the success of interdisciplinary and institutional collaboration, which has promoted our achievements in the scientific field.” The pioneering achievements of industrial partners in quantum teleportation.
Quantum network tests inaccessible communications
Raju Valivarthi et al. The teleportation system leading to the quantum internet, As PRX (2020). DOI: 10.1103 / PRXQuantum.1.020317
Provided by the University of Chicago
Citation: Researchers achieved continuous high-fidelity quantum teleportation (December 29, 2020). The technology was launched from https://phys.org/news/2020-12-sustained-high- on December 29, 2020. fidelity-quantum-teleportation.html
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