TITLE

Reducing microwave loss in superconducting resonators due to trapped vortices

AUTHOR(S)
Song, C.; DeFeo, M. P.; Yu, K.; Plourde, B. L. T.
PUB. DATE
December 2009
SOURCE
Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p232501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Microwave resonators with high quality factors have enabled many recent breakthroughs with superconducting qubits and photon detectors, typically operated in shielded environments to reduce the ambient magnetic field. Insufficient shielding or pulsed control fields can introduce vortices, leading to reduced quality factors, although increased pinning can mitigate this effect. A narrow slot etched into the resonator surface provides a straightforward method for pinning enhancement without otherwise affecting the resonator. Resonators patterned with such a slot exhibited over an order of magnitude reduction in the excess loss due to vortices compared with identical resonators from the same film with no slot.
ACCESSION #
46708398

 

Related Articles

  • Decay of the vacuum with production of e[sup +]e[sup -] pairs in very strong magnetic fields. Calucci, Giorgio // AIP Conference Proceedings;2001, Vol. 564 Issue 1, p92 

    The statement that around some astrophysical object huge magnetic fields may exist, even larger than 10[sub 9]T has been repeatedly made. In view of this fact the study of QED in presence of a magnetic field of very high intensity, both static and quasi static might find an experimental although...

  • The PVLAS collaboration: Experimental search for anisotropy of the phase velocity of light in vacuum due to a static magnetic field. Zavattini, E.; Brandi, F.; Bregant, M.; Cantatore, G.; Carusotto, S.; Della Valle, F.; Di Domenico, G.; Gastaldi, U.; Milotti, E.; Pengo, R.; Petrucci, G.; Polacco, E.; Ruoso, G.; Zavattini, G. // AIP Conference Proceedings;2001, Vol. 564 Issue 1, p77 

    After a brief description of the now operating PVLAS apparatus and of its goals, we present and discuss the preliminary experimental results obtained from the first recent measurement runs conducted with the complete setup.

  • Physics in ultra-strong magnetic fields. Duncan, Robert C. // AIP Conference Proceedings;2000, Vol. 526 Issue 1, p830 

    In magnetic fields stronger than B[sub Q]≡m[sub e][sup 2]c[sup 3]/he=4.4×10[sup 13] Gauss, an electron’s Landau excitation energy exceeds its rest energy. I review the physics of this strange regime and some of its implications for the crusts and magnetospheres of neutron stars....

  • Photon Splitting and Pair Conversion in Strong Magnetic Fields. Baring, Matthew G. // AIP Conference Proceedings;10/17/2008, Vol. 1051 Issue 1, p53 

    The magnetospheres of neutron stars provide a valuable testing ground for as-yet unverified theoretical predictions of quantum electrodynamics (QED) in strong electromagnetic fields. Exhibiting magnetic field strengths well in excess of a TeraGauss, such compact astrophysical environments permit...

  • New QED calculations for processes in strong magnetic fields. Leahy, D.; Semionova, L. // AIP Conference Proceedings;2000, Vol. 526 Issue 1, p862 

    The results of some new QED calculations are presented. We consider two-photon emission by electrons, and determine magnetic field, spin and polarization dependence of the transition rates. We utilize the electron wave functions of Sokolov and Ternov (1968, Synchrotron Radiation, Berlin:...

  • Chiral limit of the two-dimensional fermionic determinant in a general magnetic field. Fry, M. P.; Fry, M.P. // Journal of Mathematical Physics;Apr2000, Vol. 41 Issue 4 

    We consider the effective action for massive two-dimensional QED in flat Euclidean space-time in the background of a general square-integrable magnetic field with finite range. It is shown that its small mass limit is controlled by the chiral anomaly. New results for the low-energy scattering of...

  • Phase locking in Heisenberg helimagnets. Harris, A. B.; Rastelli, E.; Tassi, A. // Journal of Applied Physics;5/1/1990, Vol. 67 Issue 9, p5445 

    Considers a Heisenberg model with ferromagnetic nearest-neighbor and competing further-neighbor exchange interactions in a small applied magnetic field. Effects of non-zero temperature and quantum effects; Description of the classical x-y model; Modulation vector in zero field.

  • Factors of inhomogeneous spatial response of superconducting tunnel junction detectors. Pressler, H.; Ohkubo, M.; Koike, M.; Ukibe, M.; Zama, T.; Nakamura, T.; Katagiri, M. // AIP Conference Proceedings;2002, Vol. 605 Issue 1, p19 

    Spatial uniformity in the response of superconducting tunnel junction detectors (STJ) to photons is a main concern in the development of these devices. Low Temperature Scanning Synchrotron Microscopy (LTSSM) has been used to directly image spatial profiles of the response of Nb-based STJ to...

  • Formation and manipulation of a metallic wire of single gold atoms. Yanson, A.I.; Bollinger, G. Rubio; van den Brom, H. E.; Agraït, N.; van Ruitenbeek, J. M. // Nature;10/22/1998, Vol. 395 Issue 6704, p783 

    Presents research which studied electrical conductance through a monovalent metal contact. Quantum effects on electron transport; Quantum properties of conductance; Transition to tunnelling when breaking a metallic contact; Breaking of atomic-scale gold contacts; Formation of gold chains;...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics