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Choi, Gahyun,Yoon, Hoon Hahn,Jung, Sungchul,Jeon, Youngeun,Lee, Jung Yong,Bahng, Wook,Park, Kibog American Institute of Physics 2015 APPLIED PHYSICS LETTERS Vol.107 No.25
<P>The Au/Ni/Al2O3/4H-SiC junction with the Al2O3 film as a thin spacer layer was found to show the electrical characteristics of a typical rectifying Schottky contact, which is considered to be due to the leakiness of the spacer layer. The Schottky barrier of the junction was measured to be higher than an Au/Ni/4H-SiC junction with no spacer layer. It is believed that the negative surface bound charge originating from the spontaneous polarization of 4H-SiC causes the Schottky barrier increase. The use of a thin spacer layer can be an efficient experimental method to modulate Schottky barriers of metal/4H-SiC junctions. (C) 2015 AIP Publishing LLC.</P>
Park Gwanyeol,Choi Gahyun,Choi Jisoo,Choi Jiman,Lee Soon-Gul,Lee Kwan-Woo,Song Woon,Chong Yonuk 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.11
The remarkable advances of quantum computation technology with superconducting qubits based on circuit quantum electrodynamics (QED) architecture have been achieved by improving control, protection and measurement of the quantum states at the same time. At the heart of all these quantum operations, the significant enhancement of the qubit coherence time during the last decades was the key. Even after all these advances, the coherence and relaxation time of superconducting qubits still requires further improvements toward fault-tolerant quantum computation. Here, we report our observation of a strongly enhanced lifetime of an in-situ tunable superconducting transmon qubit on a silicon substrate that is embedded in a three-dimensional copper cavity. We measured a lifetime of the qubit of up to 84 μs, which is the best reported value of an in-situ tunable transmon on a silicon substrate. In our experiment, the in-situ frequency tunability over a broad range enabled the Purcell factor to be controlled continuously by detuning the qubit frequency against the resonator frequency in the strong dispersive regime. The silicon substrate has its own importance because the substrate should be fully compatible with the conventional semiconductor processes so that scalability and multi-chip module capability are guaranteed. In order to control the Purcell factor with another parameter, we displaced the qubit position in the cavity and observed a longer relaxation time with a smaller coupling coefficient. We believe that this systematic study and the control technique of the Purcell effect in the circuit QED design, together with minimizing the microwave photon loss through an improvement of the fabrication, will contribute to the realization of a practical large-scale quantum computer based on superconducting qubit technology.
Away from__ : 손전등 위치인식을 이용한 인터랙션 미디어아트
김가현(Gahyun Kim),오채령(Cheryoung Oh),최용순(Yongsoon Choi) 한국HCI학회 2022 한국HCI학회 학술대회 Vol.2022 No.2
COVID-19 로 인해 업무와 휴식의 경계션이 흐릿해져 그로 인한 우울을 느끼는 사람들이 많아졌다. 본 작품은 코로나 블루의 원인에 기반하여 착안된 전시로, 위치기반 손전등을 활용하여 사용자의 움직임과 각도를 이용해 프로젝션 매핑을 연출한다. 사용자는 텅 빈 공간에서 혼자만의 시간을 가지며 자유롭게 이동할 수 있다. 바닥과 정면 공간에서는 파도가 치고, 사용자의 위치와 손전등의 각도를 인식해 정면 공간에서 오로라를 발견할 수 있다. 외부로부터 단절된 사용자는 스스로가 재구성해낸 공간으로 들어가 인터랙션을 통해 스스로가 능동적인 생산자로 재탄생하는 경험을 갖게 된다.