Observations of quantum entangled states and quantum critical behavior by using a precise probing method of microwave near-field

利用微波近场精密探测方法观测量子纠缠态和量子临界行为

• 批准号: 21200035
• 负责人: KITANO Haruhisa
• 金额: $ 19.8万
• 依托单位: Aoyama Gakuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Innovative Areas (Research a proposed research project)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21200035/
• 关键词: 超伝導体; 量子もつれ合い; マイクロ波; 空洞共振器; 量子相転移; 超伝導材料・素子; マイクロ波近接場; ジョセフソン接合; ジョセブソン接合

Quantum entangled states become essentially important in both regions of condensed matter physics and quantum information technology. Toward a complete understanding of such states, we study the development of a microwave microscope to probe the quantum critical behavior in the neighborhood of quantum critical point, and the design of a superconducting cavity resonator to investigate the quantum entangled states generated by using a quantum electrodynamics theory. We found that a spatial resolution of the microwave microscope is strongly enhanced by utilizing a microwave near-field, which is realized by the insertion of a metallic needle into a cavity resonator. We also found that such an insertion of the metallic needle is useful for a precise control of the coupling constant between the Josephson quantum bits and the microwave photons at low temperatures, which is required to create the quantum entangled states.

量子纠缠态在凝聚态物理和量子信息技术领域都变得至关重要。为了全面了解这些状态，我们研究了微波显微镜的开发，以探测量子临界点附近的量子临界行为，以及超导腔谐振器的设计，以研究使用量子电动力学产生的量子纠缠态理论。我们发现，通过利用微波近场，微波显微镜的空间分辨率得到了极大的提高，这是通过将金属针插入空腔谐振器来实现的。我们还发现，金属针的这种插入对于在低温下精确控制约瑟夫森量子比特和微波光子之间的耦合常数是有用的，这是创建量子纠缠态所必需的。

项目成果

超伝導揺らぎから見た高温超伝導銅酸化物の超伝導発現機構

从超导涨落看出高温超导铜酸盐的超导机理

• 发表时间: 2010
• 期刊: 固体物理
• 作者: 北野晴久;大橋健良;前田京剛
• 通讯作者: 前田京剛

(TMTTF)_2SbF_6のマイクロ波電気伝導度測定

(TMTTF)_2SbF_6的微波电导率测量

• 发表时间: 2009
• 作者: 竹腰秀甫;他
• 通讯作者: 他

Completely hydrostatic pressure effect of anisotropic resistivity in the 1-D organic conductor (TMTTF)_2SbF_6

一维有机导体(TMTTF)_2SbF_6中各向异性电阻率的完全静水压力效应

• DOI: 10.1016/j.physc.2009.11.138
• 发表时间: 2010
• 期刊: Physica
• 作者: M. Itoi;Y. Ishii;S. Takekoshi; H. Kitano;K. Matsubayashi;Y. Uwatoko;T. Nakamura
• 通讯作者: T. Nakamura