2016 Fiscal Year Annual Research Report
| Project/Area Number |
16F16325
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| Research Institution | Tohoku University |
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Principal Investigator |
Bauer Gerrit 東北大学, 金属材料研究所, 教授 (10620213)
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| Co-Investigator(Kenkyū-buntansha) |
Elyasi Mehrdad 東北大学, 金属材料研究所, 外国人特別研究員
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| Project Period (FY) |
2016-11-07 – 2019-03-31
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| Keywords | Magnon / Entanglement / Microwave / Optical / Non-cassical |
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| Outline of Annual Research Achievements |
A thorough literature review on the subjects related to superconductivity, superconducting (SC) qubit structures, cavity and circuit quantum electrodynamics, quantum information processing algorithms, and hybrid quantum circuits, has been performed. A more detailed attention has been given to entanglement for both spin systems and coherent states of bosons. Different paths for generation of entanglement and nonclassical states have been studied. The studies led to ideas for generating entanglement among magnon modes of extended magnets inside a microwave cavity in the presence of a SC qubit. The idea was formulated and a sequential method for generation of entanglement between magnon modes of two magnets was analytically predicted and numerically demonstrated. Next, the focus was given to develop a more experimentally relevant idea, with a vision of a system consisting of magnets coupled to microwave (cavity microwave modes) and optical (e.g. whispering gallery modes) modes. The objective was to achieve a method to spatially localize a coherent state interchangeably between two magnets or more. In addition to that, generation of squeezed modes and nonclassical states of magnon in such system is of interest. The analytical (squeezing methods like one-axis twisting and nonclassical state generation like heralding mechanisms) and numerical tools (calculation of Wigner distribution on the Bloch sphere and in the quadrature plane) for dealing with such entangled states in spin systems and coherent states of bosons were practiced and developed to be used for analysis purposes.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
Although the direction of research has had a minor deviation from the planned schedule, the quality and quantity of achievements is in-line with the plan.
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| Strategy for Future Research Activity |
The plan for this year is to finalize the currently ongoing study of a system consisting of a twin magnet inside a microwave cavity and in the presence of an optical mode coupler. The purpose is to achieve spatially resolved interchange of magnon coherent states between the magnets using the microwave and optical couplings, followed by spin squeezing, two mode squeezing and generation of nonclassical states. This work is envisioned to be published as a journal paper in near future. Also, as the elements of such study are currently used by our experimental collaborators, the results of our study will be communicated with them to envision a path for possible experimental demonstration. Next, there will be a focus on implementing the unique features of spintronics such as effects associated with spin-orbit coupling in the developed vision of optomagnonic in conjunction with the cavity quantum electrodynamics and superconducting qubits in different coupling regimes depending on the requirements.
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