2019 Fiscal Year Annual Research Report
Microwave quantum optics on superconducting circuits
| Project/Area Number |
18F18799
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| Research Institution | The University of Tokyo |
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Principal Investigator |
中村 泰信 東京大学, 先端科学技術研究センター, 教授 (90524083)
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| Co-Investigator(Kenkyū-buntansha) |
GHEERAERT NICOLAS 東京大学, 先端科学技術研究センター, 外国人特別研究員
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| Project Period (FY) |
2018-11-09 – 2021-03-31
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| Keywords | Superconducting qubit / microwave / quantum optics |
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| Outline of Annual Research Achievements |
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.
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| Research Progress Status |
翌年度、交付申請を辞退するため、記入しない。
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| Strategy for Future Research Activity |
翌年度、交付申請を辞退するため、記入しない。
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