Quantum dots are tiny semiconductor structures that can serve as qubits, with quantum information stored in the spin or charge states of confined electrons. But the limited coherence time of these qubits greatly restricts their potential applications. Now, Kha Tran at the US Naval Research Laboratory, Washington, DC, and his colleagues, and Pasquale Scarlino at the Swiss Federal Institute of Technology (ETH), Zurich, and his colleagues, have demonstrated ways to increase this coherence time [1, 2].
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