Seminar: Generalized Matching Condition for Unit Efficiency Quantum Transduction

TimeFeb. 11, 2022, 10:00 am (Taipei Time)
SpeakerChiao-Hsuan Wang
TitleGeneralized Matching Condition for Unit Efficiency Quantum Transduction
AbstractCoherently converting quantum states between distinct elements via quantum transducers remains a crucial yet challenging task in quantum science. Especially in demand is quantum transduction between optical frequencies, which are ideal for low-loss transmission across long distances, and microwave frequencies, which admit high-fidelity quantum operations. We present a generic formalism for N-stage quantum transduction that covers various leading microwave-to-optical, microwave-to-microwave, and optical-to-optical linear conversion approaches. We then identify effective circuit models and the resulting generalized matching conditions for achieving maximum conversion efficiency. The generalized matching condition requires resistance matching as well as frequency matching beyond the usual resonant assumption, with simple impedance matched transmission interpretation. Our formalism provides a universal toolbox for determining experimental parameters to realize efficient quantum transduction and suggests new regimes of non-resonant conversions that can outperform all-resonant ones.
Personal informationChiao-Hsuan Wang received her Bachelor and Master’s degree in Physics from National Taiwan University, where she studied quantum entanglement and emergent gravity with Pisin Chen. She completed her Ph.D. in Physics at the University of Maryland, College Park. While in UMD, she worked with Jacob M. Taylor on quantum optics, matter-light interactions, quantum simulation, and condensed matter theory. She joined Liang Jiang’s group at Yale as a postdoctoral associate in 2018 and relocated to University of Chicago in 2019. Her current interests include quantum transduction between microwave and optical modes, quantum information processing with superconducting circuits, and fault-tolerant bosonic quantum error correction. She will be joining the Department of Physics at National Taiwan University as an assistant professor in August 2022.