Measuring nanomechanical motion with a microwave cavity interferometer

被引:422
作者
Regal, C. A.
Teufel, J. D.
Lehnert, K. W. [1 ]
机构
[1] Natl Inst Stand & Technol, JILA, Boulder, CO 80309 USA
基金
美国国家科学基金会;
关键词
D O I
10.1038/nphys974
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A mechanical resonator is a physicist's most tangible example of a harmonic oscillator. With the advent of micro and nanoscale mechanical resonators, researchers are rapidly progressing towards a tangible harmonic oscillator with motion that requires a quantum description. Challenges include freezing out the thermomechanical motion to leave only zero-point quantum fluctuations delta x(zp) and, equally importantly, realizing a Heisenberg-limited displacement detector. Here, we introduce a detector that can be in principle quantum limited and is also capable of efficiently coupling to the motion of small-mass, nanoscale objects, which have the most accessible zero-point motion. Specifically, we measure the displacement of a nanomechanical beam using a superconducting transmission-line microwave cavity. We realize excellent mechanical force sensitivity (3 aN Hz(-1/2)), detect thermal motion at tens of millikelvin temperatures and achieve a displacement imprecision of 30 times the standard quantum limit.
引用
收藏
页码:555 / 560
页数:6
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