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Quantum Systems Learn Joint Computing

By Max Planck Institute of Quantum Optics (Germany)

February 8, 2021

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Researchers at Germany's Max Planck Institute of Quantum Optics (MPQ) connected two quantum bits (qubits) in two different laboratories to a distributed quantum computer via a 60-meter (196-foot) optical fiber.

This represents the world's first distributed quantum computer prototype, which the MPQ team realized by using modules consisting of a single atom as a qubit positioned between two mirrors.

A single light photon was transmitted between the modules, then entangled with the quantum states of the module's qubits.

One qubit's state changed according to the measured state of the ancilla photon, supporting a quantum mechanical controlled NOT gate-operation with a fidelity of 80%.

MPQ's Gerhard Rempe said, "Our scheme opens up a new development path for distributed quantum computing."

From Max Planck Institute of Quantum Optics (Germany)
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