工程化超導電路上三維腔量子電動力學系統;Engineering 3D Transmon and Cavity for Cavity Quantum Electrodynamics

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题名:	工程化超導電路上三維腔量子電動力學系統;Engineering 3D Transmon and Cavity for Cavity Quantum Electrodynamics
作者:	洪偉晟;Hung, Wei-Cheng
贡献者:	物理學系
关键词:	超導量子電路;量子位元;腔量子電動力學;Superconducting Quantum Circuit;Qubit;Cavity Quantum Electrodynamics
日期:	2021-07-14
上传时间:	2021-12-07 12:04:04 (UTC+8)
出版者:	國立中央大學
摘要:	超導量子電路(Superconducting Quantum Circuit)為近20年熱門的研究領域與實驗平台，透過電路中巨觀(macroscopy)的電荷與磁通量的量子化現象進而製造出在量子物理中所需的能階結購。利用超導量子電路進行的實驗有幾個好處，首先是量測方法為測量電壓與電流訊號，實驗方法較為簡易與普遍，市面上許多常規的儀器便能用於此類實驗；其次由於電路元件如電容、電感是由人類所設計，因此實驗條件也大多數能由人類控制，可以做一些用為原子分子平台中比較困難進行的實驗。而在所有超導量子電路實驗中最熱門的工作為量子位元的製作與操控，本工作便是重現了其中一種類別的量子位元: 三維共振腔內的量子位元。本篇詳述了量子位元的背景、與三維共振腔內的量子位元的設計、製造與特徵值量測。由於本工作為比較草創的階段的實驗，因此仍有許多面向能改進，以結果而言，三維共振腔內的量子位元是一個快速建構的實驗平台，其同調時間(coherence time)在沒有極大化優化實驗條件下便能有一微秒，雖不到國外團隊今日之平均值，但是能對於一些初步的脈衝實驗、設備與線路進行檢測。;Superconducting Quantum Circuit(SQC) is a popular platform for the Quantum Electrodynamics(QED) experiment in recent twenty years. With the charge and the ux quantization in macroscopy, we can construct the energy levels which are the basis of quantum mechanics.There are several advantages of processing the quan- tum experiment on the SQC. First is the quantum system can be measured only with the voltage and the current. Some of the commercial instruments are enough for the experiment. Second, atoms are made from the capacitor and the inductor. Due to the atoms are made from the circuit elements, the feature parameters such as eld coupling and the transitions can be designed by humans. One of the experiment branches of the QED on SQC is the Cavity QED in 3-dimensional superconducting cavity. In this work,we set up a cavity quantum electrodynamics experiment plat- form on superconducting quantum circuit. In our experiment,we embed a Transmon in 3D Aluminum cavity and measure the response of the device. It is our rst time preparing 3D cavity QED system. The coherence in our devices reaches 1 s with- out much improvement. We believe if we process the Transmon or the Cavity with the surface treatment, we can improve the coherence in more than one order. For the 1 1 s coherence qubit, it is su cient for us to correct the problem in the cable wiring or the experiment setup. It is also enough for us to do some basic pulses measurement.
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