Researchers Achieve Sustained, Faithful Quantum Teleportation

Researchers Achieve Sustained, Faithful Quantum Teleportation

In a demonstration of high-quality quantum teleportation at the Fermilab Quantum Network, fiber optic cables connect standards (shown above), as well as modern R&D devices. Credit: Fermilab

A viable quantum internet – a network in which information stored in kwbits is shared over long distances by means of entanglement – would transform the fields of data storage, precision sensing and computer processing and usher in a new era of communication.

This month, scientists from the Fermi National Accelerator Laboratory – a national laboratory of the US Department of Energy affiliated with the University of Chicago – together with partners at five institutions took an important step towards the realization of a quantum internet.

In an article published in PRX Quantum, the team presents for the first time a demonstration of a sustained long-range teleportation of qubits made from photons (light particles) with a greater fidelity than 90%.

The quabits were teleported off the shelf via a 44-kilometer fiber network using the latest single-photon detectors as well as equipment.

“We are delighted with these results,” said Fermilab scientist Panagiotis Spentzouris, head of the Fermilab quantum science program and one of the co-authors of the article. “This is a major achievement on the way to building a technology that will define how we conduct global communications.”

The achievement comes just months after the US Department of Energy unveiled its blueprint for a national quantum internet at a press conference at the University of Chicago.

Switch particles

Quantum teleportation is a “disembodied” transfer of quantum states from one place to another. The quantum teleportation of a kwbit is achieved using quantum entanglement, in which two or more particles are inextricably linked. If an entangled pair of particles is shared between two separate locations, regardless of the distance between them, the encoded information is sent.

The joint team – researchers from Fermilab, AT&T, Caltech, Harvard University, NASA Jet Propulsion Laboratory and the University of Calgary – successfully teleported quits on two systems: the Caltech Quantum Network and the Fermilab Quantum Network. The systems were designed, built, deployed and deployed through Caltech’s public-private research program on Intelligent Quantum Networks and Technologies, or IN-Q-NET.

“We are very proud to have reached this milestone on sustainable, high-performing and scalable quantum teleportation systems,” Maria Spiropulu, Shang-Yi Ch’en Professor of Physics to Caltech and Director of IN-Q-NET research program, said. . “The results will be further improved with system upgrades we expect to complete by the second quarter of 2021.”

Both the Caltech and Fermilab networks, which contain almost autonomous data processing, are compatible with existing telecommunications infrastructure and with emerging quantum processing and storage devices. Researchers use it to spread the fidelity and rate of entanglement, with an emphasis on complex quantum communication protocols and fundamental science.

“With this demonstration, we are beginning to lay the groundwork for building a metropolitan quantum network in Chicago,” Spentzouris said.

The Chicagoland network, called the Illinois Express Quantum Network, is designed by Fermilab in collaboration with Argonne National Laboratory, Caltech, Northwestern University, and industry partners.

“The achievement is a testament to the success of collaboration between disciplines and institutions, which drives so much of what we achieve in science,” said Fermilab, deputy director of research, Joe Lykken. “I commend the IN-Q-NET team and our partners in academia and industry for this first-class achievement in quantum teleportation.

Quantum network to test hackable communication

More information:
Raju Valivarthi et al. Teleportation systems to a quantum internet, PRX Quantum (2020). DOI: 10.1103 / PRXQuantum.1.020317

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