We plan to study various systems and devices to realize quantum information processing through collaborations with experimental groups. In particular, one of our main targets is to explore diverse practical subjects on qubits in solid state systems (for example, electron spins, superconducting circuits, and excitonic polaritons), and investigate small-sized quantum circuits or quantum simulators, made with such qubits. Moreover, we plan to establish guiding principles to control and design the coherence of materials and photons that can be used to predict novel quantum devices. We also plan to propose systems (protocols and architectures) for quantum information processing to realize secure communications and distributed quantum processing on the basis of state-of-the-art experimental knowledge. By evaluating their physical requirements and potentials, we hope to make them more useful, to help the future of quantum information science.
Fig.1 Model system of coherent control and detection of spin qubits. We plan to investigate their couplings to photons, nuclear spins, or quasi-particles in solids.
Fig.2 Quantum mechanics realizes unexpected correlations in multiple systems. Utilizing this in secret communication protocols, a “bad” photon source (blue) can provide the same results as a good photon source (red).