A Josephson Junction Microscope for Low-frequency Fluctuators.pdfVIP

下载本文档

3
0
约1.89万字
约 5页
2017-04-11 发布于江苏
举报
版权申诉

A Josephson Junction Microscope for Low-frequency Fluctuators.pdf

1、有哪些信誉好的足球投注网站（book118）网站文档一经付费（服务费），不意味着购买了该文档的版权，仅供个人/单位学习、研究之用，不得用于商业用途，未经授权，严禁复制、发行、汇编、翻译或者网络传播等，侵权必究。。
2、本站所有内容均由合作方或网友上传，本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺！文档内容仅供研究参考，付费前请自行鉴别。如您付费，意味着您自己接受本站规则且自行承担风险，本站不退款、不进行额外附加服务；查看《如何避免下载的几个坑》。如果您已付费下载过本站文档，您可以点击这里二次下载。
3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等，请点击“版权申诉”（推荐），也可以打举报电话：400-050-0827(电话支持时间：9:00-18:30)。
4、该文档为VIP文档，如果想要下载，成为VIP会员后，下载免费。
5、成为VIP后，下载本文档将扣除1次下载权益。下载后，不支持退款、换文档。如有疑问请联系我们。
6、成为VIP后，您将拥有八大权益，权益包括：VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
7、VIP文档为合作方或网友上传，每下载1次，网站将根据用户上传文档的质量评分、类型等，对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档

A Josephson Junction Microscope for Low-frequency Fluctuators

a r X i v : 0 7 0 5 .1 3 8 0 v 1 [ c o n d - m a t .m e s - h a l l ] 1 0 M a y 2 0 0 7 A Josephson Junction Microscope for Low-frequency Fluctuators L. Tian1, ? and R. W. Simmonds2, ? 1Department of Applied Physics and E. L. Ginzton Laboratory, Stanford University, Stanford, CA 94305 2National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305-3328, USA (Dated: February 1, 2008) The high-Q harmonic oscillator mode of a Josephson junction can be used as a novel probe of spurious two-level systems (TLSs) inside the amorphous oxide tunnel barriers of the junction. In particular, we show that spectroscopic transmission measurements of the junction resonator mode can reveal how the coupling magnitude between the junction and the TLSs varies with an external magnetic field applied in the plane of the tunnel barrier. The proposed experiments offer the possibility of clearly resolving the underlying coupling mechanism for these spurious TLSs, an important decoherence source limiting the quality of superconducting quantum devices. Superconducting quantum circuits have been inten- sively tested in various regimes in the past few years, from superconducting qubits demonstrating long coher- ence times, to superconducting transmission line cav- ities coherently coupled to a Single Cooper Pair box [1, 2, 3, 4, 5, 6]. Such circuits are extremely sensitive to very small quanta and defect states, and hence have the ability to detect individual microwave photons, charged quasiparticles, as well as spurious TLSs within or near Josephson junction tunnel barriers [7, 8, 9, 10, 11]. In recent experiments [10, 11], TLSs were identified through spectroscopic measurements of a superconducting phase qubit appearing as ‘gaps” or “splittings” in the energy spectrum. The TLS defects can be an unwanted source of de- coherence for superconducting quantum bits. The low- frequency noise, which has been shown to be a seri- ous source of decoherence for superconduct