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Superconducting Circuits Push the Limits of Quantum Data Transfer

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A backside-illuminated optical photograph of a fabricated device with false coloring, showing all components including the 2 mlong coplanar waveguide, as well as the printed circuit board to which the die is wirebonded for signal routing.

Said researcher Andrew Cleland, "Overall, our work demonstrates a feasible path towards highly efficient communication of more complex quantum states than just single photons between two nodes."

Credit: Grebel et al/Physical Review Letters

University of Chicago researchers created a quantum communication testbed with remote superconducting nodes, laying the foundation for more secure communication networks.

Two superconducting qubits were connected to tunable superconducting resonators, each attached to a transmission line via a variable coupler.

The coupler was activated, releasing the quantum state from the resonator and transmitting it as a group of entangled mobile photons.

The other resonator received those photons, and its qubit analyzed them.

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