Illustration of Array of Quantum Dots, Enabling Spin Exchange Over Record Distance (IMAGE)

University of Copenhagen

Illustration of Array of Quantum Dots, Enabling Spin Exchange Over Record Distance

Caption

Researchers at the Niels Bohr Institute cooled a chip containing a large array of spin qubits below -273 Celsius. To manipulate individual electrons within the quantum-dot array, they applied fast voltage pulses to metallic gate electrodes located on the surface of the gallium-arsenide crystal (see scanning electron micrograph). Because each electron also carries a quantum spin, this allows quantum information processing based on the array's spin states (the arrows on the graphic illustration). During the mediated spin exchange, which only took a billionth of a second, two correlated electron pairs were coherently superposed and entangled over five quantum dots, constituting a new world record within the community.

Credit

Ferdinand Kuemmeth

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Credit: Ferdinand Kuemmeth

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