Decoupling a Cooper-Pair Box to Enhance the Lifetime to 0.2 ms

被引:60
作者
Kim, Z. [1 ,2 ]
Suri, B. [1 ,2 ]
Zaretskey, V. [1 ,2 ]
Novikov, S. [1 ,2 ]
Osborn, K. D. [1 ]
Mizel, A. [1 ]
Wellstood, F. C. [2 ,3 ,4 ]
Palmer, B. S. [1 ]
机构
[1] Lab Phys Sci, College Pk, MD 20740 USA
[2] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
[3] Joint Quantum Inst, College Pk, MD 20742 USA
[4] Ctr Nanophys & Adv Mat, College Pk, MD 20742 USA
关键词
SINGLE-ELECTRON TRANSISTORS; NOISE; CIRCUIT;
D O I
10.1103/PhysRevLett.106.120501
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We present results on a circuit QED experiment in which a separate transmission line is used to address a quasilumped element superconducting microwave resonator which is in turn coupled to an Al/AlO(x)/Al Cooper-pair box charge qubit. With our device, we find a strong correlation between the lifetime of the qubit and the inverse of the coupling between the qubit and the transmission line. At the smallest coupling we measured, the lifetime of the Cooper-pair box was T(1) = 200 mu s, which represents more than a twentyfold improvement in the lifetime of the Cooper-pair box compared with previous results. These results imply that the loss tangent in the AlO(x) junction barrier must be less than about 4 X 10(-8) at 4.5 GHz, about 4 orders of magnitude less than reported in larger area Al/AlO(x)/Al tunnel junctions.
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页数:4
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共 18 条
[1]   A coherent all-electrical interface between polar molecules and mesoscopic superconducting resonators [J].
Andre, A. ;
Demille, D. ;
Doyle, J. M. ;
Lukin, M. D. ;
Maxwell, S. E. ;
Rabl, P. ;
Schoelkopf, R. J. ;
Zoller, P. .
NATURE PHYSICS, 2006, 2 (09) :636-642
[2]   Quantum noise in the Josephson charge qubit [J].
Astafiev, O ;
Pashkin, YA ;
Nakamura, Y ;
Yamamoto, T ;
Tsai, JS .
PHYSICAL REVIEW LETTERS, 2004, 93 (26)
[3]   Cavity quantum electrodynamics for superconducting electrical circuits: An architecture for quantum computation [J].
Blais, A ;
Huang, RS ;
Wallraff, A ;
Girvin, SM ;
Schoelkopf, RJ .
PHYSICAL REVIEW A, 2004, 69 (06) :062320-1
[4]   A broadband superconducting detector suitable for use in large arrays [J].
Day, PK ;
LeDuc, HG ;
Mazin, BA ;
Vayonakis, A ;
Zmuidzinas, J .
NATURE, 2003, 425 (6960) :817-821
[5]   OBSERVATION OF SINGLE-ELECTRON CHARGING EFFECTS IN SMALL TUNNEL-JUNCTIONS [J].
FULTON, TA ;
DOLAN, GJ .
PHYSICAL REVIEW LETTERS, 1987, 59 (01) :109-112
[6]   Back-action-evading measurements of nanomechanical motion [J].
Hertzberg, J. B. ;
Rocheleau, T. ;
Ndukum, T. ;
Savva, M. ;
Clerk, A. A. ;
Schwab, K. C. .
NATURE PHYSICS, 2010, 6 (03) :213-217
[7]   Controlling the spontaneous emission of a superconducting transmon qubit [J].
Houck, A. A. ;
Schreier, J. A. ;
Johnson, B. R. ;
Chow, J. M. ;
Koch, Jens ;
Gambetta, J. M. ;
Schuster, D. I. ;
Frunzio, L. ;
Devoret, M. H. ;
Girvin, S. M. ;
Schoelkopf, R. J. .
PHYSICAL REVIEW LETTERS, 2008, 101 (08)
[8]   Temperature dependence of low-frequency noise in Al-Al2O3-Al single-electron transistors [J].
Kenyon, M ;
Lobb, CJ ;
Wellstood, FC .
JOURNAL OF APPLIED PHYSICS, 2000, 88 (11) :6536-6540
[9]   Anomalous avoided level crossings in a Cooper-pair box spectrum [J].
Kim, Z. ;
Zaretskey, V. ;
Yoon, Y. ;
Schneiderman, J. F. ;
Shaw, M. D. ;
Echternach, P. M. ;
Wellstood, F. C. ;
Palmer, B. S. .
PHYSICAL REVIEW B, 2008, 78 (14)
[10]   Noise in Al single electron transistors of stacked design [J].
Krupenin, VA ;
Presnov, DE ;
Savvateev, MN ;
Scherer, H ;
Zorin, AB ;
Niemeyer, J .
JOURNAL OF APPLIED PHYSICS, 1998, 84 (06) :3212-3215