Wirebond crosstalk and cavity modes in large chip mounts for superconducting qubits

被引：64

作者：

Wenner, J. ^{[1
]}

Neeley, M. ^{[1
]}

Bialczak, Radoslaw C. ^{[1
]}

Lenander, M. ^{[1
]}

Lucero, Erik ^{[1
]}

O'Connell, A. D. ^{[1
]}

Sank, D. ^{[1
]}

Wang, H. ^{[1
]}

Weides, M. ^{[1
]}

Cleland, A. N. ^{[1
]}

Martinis, John M. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

来源：

SUPERCONDUCTOR SCIENCE & TECHNOLOGY | 2011年 / 24卷 / 06期

关键词：

D O I：

10.1088/0953-2048/24/6/065001

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We analyze the performance of a microwave chip mount that uses wirebonds to connect the chip and mount grounds. A simple impedance ladder model predicts that transmission crosstalk between two feedlines falls off exponentially with distance at low frequencies, but rises to near unity above a resonance frequency set by the chip to ground capacitance. Using SPICE simulations and experimental measurements of a scale model, the basic predictions of the ladder model were verified. In particular, by decreasing the capacitance between the chip and box grounds, the resonance frequency increased and transmission decreased. This model then influenced the design of a new mount that improved the isolation to -65 dB at 6 GHz, even though the chip dimensions were increased to 1 cm x 1 cm, three times as large as our previous devices. We measured a coplanar resonator in this mount as preparation for larger qubit chips, and were able to identify cavity, slotline, and resonator modes.

引用

页数：7

共 21 条

[1]

ANDRESEN RP, 2010, ANDRESEN SOFTWARE

[2]

[Anonymous], 2004, MICROWAVE ENG

[3] Vacuum-Gap Capacitors for Low-Loss Superconducting Resonant Circuits [J].

Cicak, Katarina ;

Allman, Michael S. ;

Strong, Joshua A. ;

Osborn, Kevin D. ;

Simmonds, Raymond W. .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 2009, 19 (03) :948-952

[4] Superconducting quantum bits [J].

Clarke, John ;

Wilhelm, Frank K. .

NATURE, 2008, 453 (7198) :1031-1042

[5] Phase coherent dynamics of a superconducting flux qubit with capacitive bias readout [J].

Deppe, F. ;

Mariantoni, M. ;

Menzel, E. P. ;

Saito, S. ;

Kakuyanagi, K. ;

Tanaka, H. ;

Meno, T. ;

Semba, K. ;

Takayanagi, H. ;

Gross, R. .

PHYSICAL REVIEW B, 2007, 76 (21)

[6] Demonstration of two-qubit algorithms with a superconducting quantum processor [J].

DiCarlo, L. ;

Chow, J. M. ;

Gambetta, J. M. ;

Bishop, Lev S. ;

Johnson, B. R. ;

Schuster, D. I. ;

Majer, J. ;

Blais, A. ;

Frunzio, L. ;

Girvin, S. M. ;

Schoelkopf, R. J. .

NATURE, 2009, 460 (7252) :240-244

[7]

Feynman R. P., 2010, Mainly electromagnetism and matter, VII

[8] Fabrication and characterization of superconducting circuit QED devices for quantum computation [J].

Frunzio, L ;

Wallraff, A ;

Schuster, D ;

Majer, J ;

Schoelkopf, R .

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 2005, 15 (02) :860-863

[9]

GROVER FW, 1912, B BUR STAND, V8, P150

[10]

Johnson H.W., 2003, High-Speed Signal Propagation: Advanced Block Magic

← 1 2 3 →