Physicists successfully perform long-range stationary quantum teleportation

In recent years, quantum computing has become an active area of ​​research, a way to effectively control, manage, and transfer quantum information (qubits) to perform some complex calculations and computations. Establish communication network. The development of quantum Internet, particularly for its speed and security for users, is a major area of ​​research. And recently, the cooperation of institutions for the first time was successful in achieving stable quantum teleportation of more than 22 km. Such a result is extremely promising for the quantum Internet of the future, of which the quantum teleportation mechanism is one of the key elements.

A collaboration between Fermilab, AT&T, Harvard University, led by Caltech Jet propulsion laboratory NASA and University of Calgary, reports were successfully teleported, the basic unit of quantum information, over 22 kilometers of fiber into two test beds: Caltech Quantum Network And Fermilab Quantum Networks.

Although the collaboration knew it had “achieved significant results” in the spring of 2020, says physicist Maria Spiropulu, she avoided informally sharing on social media, from the publication of the news to the publication of the report. Full study this week.

« We wanted to push the boundaries of this type of research and take important steps to realize real applications for both communication and quantum networks and to test ideas in fundamental physics. So when we finally did, the team was thrilled, very proud of achieving these high quality results. And we are very happy to be able to move to the next stage, using the information and techniques of this work towards the deployment of quantum networks. Says Panagotis Spentzoris, manager of the quantum science program at Fermilab.

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Diagram of experimental protocols involving Alice, Bob and Charlie. © Raju Valivarti et al. 2020

The researchers say their experiment uses a “plug and play” device that is compatible with both existing telecommunications infrastructure and emerging quantum technologies. According to the study published in the journal, the results “provide a realistic basis for a high-fidelity quantum Internet with practical tools”. PRX AS.

Teleportation of Entangled Quantum States: The Basis of Future Quantum Internet

Quantum teleportation does not involve the actual transfer of matter, but involves entangled particles. The purpose of the study is to teleport the position of quantum or “quantum bits”, which are the basic units of quantum computing. According to the study, researchers determined what is essentially a compact network with three nodes: Alice, Charlie, and Bob.

In this experiment, Alice sends Charlie a qubit. Bob has a pair of entangled Quaibets and also sends Charlie a Quaib, where he interferes with Alice’s Quiet. Charlie projects Alice’s queen on an entangled Quantum Bell state that transfers Alice’s original Quiet status to Bob’s remaining Qubit.

Fidelity tells quantum teleportation
Graph showing Fidelity (stability in transfer of quats) for each teleported quantum state. © Raju Valivarti et al. 2020

The success is notable for several reasons. Many previous demonstrations of quantum teleportation over long distances have been shown to be unstable. For example, in 2016, researchers at the University of Calgary were able to perform quantum teleportation over a distance of six kilometers. It was a world record at the time and was considered a major achievement.

The ultimate goal is to create quantum networks that will use entanglement and superposition to dramatically increase computational speed, power, and security on traditional computers. For example, the US Department of Energy has an ambitious plan to build a quantum network among its national laboratories.

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Towards the development of large-scale networks

Any field dependent on computers will be affected by the realization of this technology, although a lot of future possibilities of quantum networks revolve around cryptography, search algorithms, financial services, and quantum simulations that can be models of complex phenomena.

Quantum computing has been talked about for years, and this study brings us closer to achieving it on a practical scale. Now that Fermilab, Caltech and its partners have demonstrated this important step for these networks, the team plans to further develop quantum information technology by building metropolitan-scale networks, called Illinois Express Quantum Network, Around Chicago.

« On many fronts we must move forward. Both in applications of quantum communication and network technologies and in the advancement of systems engineering. We are already working hard on developing the architecture, processes and protocols for quantum networks and optimizing certain metrics including communication rate and range. », Spentzoris included.

Source: PRX Imation

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