Sub-10 attoseconds manipulation of quantum phases and single-molecule quantum computing

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We have succeeded in controlling quantum interference of two vibrational wave-packets in a molecule almost completely, and in observing its temporal evolution in real time. In this real-time observation, we have demonstrated that the temporal evolution of a wave packet is sensitive to the relative phases among the vibrational eigenstates within the wave packet. By using our high-precision interferometric technique, it is possible to read and write a "population code" which is a population ratio among the vibrational eigenstates of a molecule. In the present study, we have demonstrated that the combination of the real-time observation and the population code can provide full quantum information of a wave packet. Moreover we have developed a novel technique to visualize quantum standing-waves (quantum ripples) generated transiently by the wave-packet interference with picometer and femtosecond spatiotemporal resolution. Very recently we have succeeded in tailoring such a visualized spatiotemporal Image (quantum fabric).We have also succeeded in developing a molecular memory based on our advanced interferometric techniques. This molecular memory is a quantum memory where each vibrational eigenstate serves as a bit, and both amplitude and phase information can be read and written. The superposition of those vibrational eigenstates can be used as a qubit. Moreover we have developed quantum gate and algorithm to apply this molecular memory to quantum information processing. A series of these achievements indicates a possibility of molecule-based optical-phase memory and quantum computer.