Chang-Yu Hsieh

My current research focuses on the following topics: 1) open quantum dynamics of simple systems embedded in a highly Non-Markovian spin bath. This effort helps to understand and design control protocol to suppress decoherence of solid state qubits in the low temperature regime where qubit-phonon interactions can be safely ignored. We also consider the energy transport through a molecular junction (or quantum dot) with spin baths as effective heat sources. 2) Quantum-classical Mapping. Through the framework of Lie algebra and geometry, we attempt to approximate a finite-level quantum system with an effective classical system. Such a mapping allows us to efficiently calculate the nonlinear response properties of a finite-level quantum system (say, electronic degrees of freedom in a molecular system) for an optical experiment.

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