超伝導量子回路上のマイクロ波量子光学
【研究分野】原子・分子・量子エレクトロニクス
【研究キーワード】
Superconducting qubit / microwave / quantum optics / quantum information
【研究成果の概要】
My work in this fiscal year consisted in developing a unidirectional emitter of microwave photons to a 1D waveguide. This work is of particular interest regarding the prospect of fabricating 1D quantum networks, where qubits coupled to a common waveguide can exchange quantum information with one another. Indeed, without some specific design that will lead to emission in a single direction, right or left, a qubit will naturally emit in both directions of the waveguide, which will thus scatter the quantum information in different locations. The same goes for absorption. If a photon from the waveguide impinges on a usual qubit from a single direction, the qubit will not be able to absorb the full photon. The device I propose, on the other hand, can absorb and emit photons unidirectionally, which allows us to circumvent this issue. The aim for now is to demonstrate the operation of a single of those unidirectional devices, coupled to an open transmission line. A large part of my time was devoted to predicting the behaviour of the systems we are considering from a theoretical point of view. By encoding the system’s physics into matrices and equations, we can calculate the time-evolution of a given physical system in time and deduce what will be its state at a future time. All these simulations were made using the Python programming language.
【研究代表者】
【研究種目】特別研究員奨励費
【研究期間】2018-11-09 - 2021-03-31
【配分額】2,200千円 (直接経費: 2,200千円)