LaHaye M D, Buu O, Camarota B, Schwab K C
Laboratory for Physical Sciences, 8050 Greenmead Drive, College Park, MD 20740, USA.
Science. 2004 Apr 2;304(5667):74-7. doi: 10.1126/science.1094419.
By coupling a single-electron transistor to a high-quality factor, 19.7-megahertz nanomechanical resonator, we demonstrate position detection approaching that set by the Heisenberg uncertainty principle limit. At millikelvin temperatures, position resolution a factor of 4.3 above the quantum limit is achieved and demonstrates the near-ideal performance of the single-electron transistor as a linear amplifier. We have observed the resonator's thermal motion at temperatures as low as 56 millikelvin, with quantum occupation factors of NTH = 58. The implications of this experiment reach from the ultimate limits of force microscopy to qubit readout for quantum information devices.
通过将单电子晶体管与品质因数高的19.7兆赫兹纳米机械谐振器耦合，我们展示了接近海森堡不确定性原理极限所设定的位置检测。在毫开尔文温度下，实现了比量子极限高4.3倍的位置分辨率，并证明了单电子晶体管作为线性放大器的近乎理想的性能。我们在低至56毫开尔文的温度下观察到了谐振器的热运动，量子占据因子NTH = 58。该实验的影响范围从力显微镜的极限到量子信息设备的量子比特读出。
