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Levelling Latin America
Mining innovation can bring more sustainable and inclusive growth, especially across the Americas…

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  • A mystery source is producing banned ozone-destroying chemicals
  • Water filter inspired by Alan Turing passes first test
  • Scientists transplant memory from one snail to another
  • In an interplanetary first, NASA to fly a helicopter on Mars
  • Facebook privacy: Europe to press Zuckerberg
  • Israeli researchers abuzz about orgasmic fruit flies
  • Integrated circuits could make quantum computers scalable
    Researchers at TU Delft and University of New South Wales have designed a scalable quantum computing architecture based on widely used complementary CMOS manufacturing techniques. The approach encodes information in the spins of individual electrons confined in quantum dots, and could allow the development of large-scale computers incorporating millions of qubits.

    For now, the state of the art in quantum computing is represented by devices with a few dozen qubits. But although quantum computers at this scale do have their uses, individual devices will need to harness hundreds, thousands, or even millions of qubits before they really come into their own.

    The researchers describe how cutting-edge CMOS processes are approaching the point at which silicon microelectronic components can be made small enough to be integrated with quantum-dot spin qubits. The architecture designed by the team is based on a silicon qubit layer enriched with silicon-28. Above this, and separated by a silica interconnect layer, the classical control and readout circuits would be patterned in isotopically normal silicon. Working at a temperature below 1 K, qubit operations would be controlled by electron spin resonance, coupling by exchange interactions between the confined electrons, and measurement by radiofrequency dispersive readout.

    Using minimum feature sizes that are achievable now or anticipated in the near term, the researchers propose a circuit geometry that would result in individual 2D modules of 480 qubits each. Thousands of these modules could be combined, producing a computer containing millions of interacting qubits.

    Physics World / Nature Communications    December 20, 2017