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Coherent control via weak measurements in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">P</mml:mi><mml:mprescripts /><mml:none /><mml:mn>31</mml:mn></mml:mmultiscripts></mml:math> single-atom electron and nuclear spin qubits
At the heart of quantum mechanics is the idea that we cannot observe a physical system without affecting it. This is normally taken to mean that the act of measurement produces uncontrolled disturbances, and ``collapses'' quantum superposition states. Here, the authors demonstrate the preparation of arbitrary quantum states of the …