Twenty years ago, theorists proposed an approach for protecting fragile spin-based qubits against the decoherence from noisy inputs. The idea was to encode information in the qubits by swapping the spin states of neighboring electrons. Unlike the usual method of flipping spins, this swapping process would add no energy to the system. Researchers at HRL Laboratories in California have now realized that design in an electrically controlled, silicon-based platform [1]. Their device—which was presented last week at the APS March Meeting—demonstrates a low-error logic gate that can be used to perform any kind of quantum computational algorithm.
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