One challenge for scaling up quantum computers to larger numbers of quantum bits (qubits) is crosstalk, where a signal meant to control the state of a certain qubit unintentionally affects a nearby qubit. Now Sandoko Kosen of Chalmers University of Technology in Sweden and his colleagues have demonstrated a 25-qubit, low-crosstalk integrated circuit whose design can be scaled up to larger quantum processors in the future [1].
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