Implementation of quantum logic gates by nuclear magnetic resonance spectroscopy

Using nuclear magnetic resonance techniques with a solution of cytosine mol ecules, we show an implementation of certain quantum logic gates (including NOT gate, square-root of NOT gate and controlled-NOT gate), which have cen tral importance in quantum computing. In addition, experimental results sho w that nuclear magnetic resonance spectroscopy can efficiently measure the result of quantum computing without attendant wave-functions collapse.