Driven Dynamics and Rotary Echo of a Qubit Tunably Coupled to a Harmonic Oscillator

被引：30

作者：

Gustavsson, S. ^{[1
]}

Bylander, J. ^{[1
]}

Yan, F. ^{[2
]}

Forn-Diaz, P. ^{[1
]}

Bolkhovsky, V. ^{[3
]}

Braje, D. ^{[3
]}

Fitch, G. ^{[3
]}

Harrabi, K. ^{[4
]}

Lennon, D. ^{[3
]}

Miloshi, J. ^{[3
]}

Murphy, P. ^{[3
]}

Slattery, R. ^{[3
]}

Spector, S. ^{[3
]}

Turek, B. ^{[3
]}

Weir, T. ^{[3
]}

Welander, P. B. ^{[3
]}

Yoshihara, F. ^{[4
]}

Cory, D. G. ^{[5
,6
,7
]}

Nakamura, Y. ^{[4
,8
]}

Orlando, T. P. ^{[1
]}

Oliver, W. D. ^{[1
,3
]}

机构：

[1] MIT, Elect Res Lab, Cambridge, MA 02139 USA

[2] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA

[3] MIT, Lincoln Lab, Lexington, MA 02420 USA

[4] RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan

[5] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

[6] Univ Waterloo, Inst Quantum Comp, Waterloo, ON N2L 3G1, Canada

[7] Perimeter Inst Theoret Phys, Waterloo, ON, Canada

[8] NEC Corp Ltd, Green Innovat Res Labs, Tsukuba, Ibaraki 3058501, Japan

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 17期

基金：

美国国家科学基金会;

关键词：

SUPERCONDUCTING FLUX QUBIT; CIRCUIT; STATES; PHOTON; CAVITY; NOISE;

D O I：

10.1103/PhysRevLett.108.170503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated the driven dynamics of a superconducting flux qubit that is tunably coupled to a microwave resonator. We find that the qubit experiences an oscillating field mediated by off-resonant driving of the resonator, leading to strong modifications of the qubit Rabi frequency. This opens an additional noise channel, and we find that low-frequency noise in the coupling parameter causes a reduction of the coherence time during driven evolution. The noise can be mitigated with the rotary-echo pulse sequence, which, for driven systems, is analogous to the Hahn-echo sequence.

引用

页数：6

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