Quantum information processing and quantum optics with superconducting qubits; traitement de l'information quantique et optique quantique ave les qubits supraconducteurs

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Quantum information is a new field of research that promises exponentially more powerful computers than those offered by current technology. These computers will harness effects that are fundamentally quantum mechanical.  A quantum computer would therefore not only be a major technological advance, it would also represent a unique laboratory for the fundamental study of quantum mechanics.  The realization of such a quantum information processor is however an extremely difficult task.  Some of the most promising approaches to its realization are based on mesoscopic electrical nano-circuits comprising superconducting junctions. The goal of this research program is to deepen our understanding of these mesoscopic devices exhibiting quantum phenomena on large length scales and to apply this new understanding to quantum information processing.  We will develop new designs of superconductor-based quantum computer architectures and investigate novel and more robust approaches to store and manipulate quantum information in these circuits.  We will also explore newly recognized parallels between these mesoscopic systems and the physics traditionally studied in quantum optics and atomic physics. By opening new avenues to harness quantum mechanical effects in solid-state devices, this research program will have impact on the fields of mesoscopic physics and quantum information processing.