Quantum Dynamics Unit (Denis Konstantinov)
Associate Professor Denis Konstantinov
denis at oist.jp
Study of quantum ensembles and their application for quantum technologies
Classical light-matter interaction has been a subject of physics research since the nineteenth century, when the Maxwell equations were formulated. On the other hand, interaction between quantized electromagnetic waves and a single quantum object has been actively studied only in the past few decades. These avenues of research have advanced our understanding of the quantum laws of nature (e.g. 2012 Nobel Prize in Physics "for ground-breaking experimental methods that enable measuring & manipulation of individual quantum systems") and paved the road for the development of quantum technologies. In the middle of all this, there is a subject of interaction of electromagnetic waves with a collection of quantum particles - an exciting field where boundaries between classical and quantum physics can be fully explored. The regime of strong light-matter interaction realized in resonant cavities can lead to many new avenues and have a direct impact on the development of new elements for future quantum technologies (e.g. hybrid quantum systems, quantum processors and memories, etc.)
In the Quantum Dynamics Unit, we explore many-particle quantum systems interacting with electromagnetic waves to discover new quantum phenomena and, where applicable, harness them for quantum technologies. Electrons on liquid helium provide an excellent experimental platform to investigate quantum many-body physics and explore new exotic states of matter. Our current work is focused on novel photo-transport phenomena, collective coupling of electron ensembles to cavity modes, electron crystals, as well as spin resonance and potential application of electrons for spin qubits. Coupled electron-nuclear spin ensembles in some crystalline solids, such as easy-plane antiferromagnets, is another system of interest to us. Also, we investigate impurity spins in diamond for use as quantum memories, microwave-optical photon quantum transducers, and other hybrid quantum systems.