Wei L F, Liu Yu-xi, Sun C P, Nori Franco
Frontier Research System, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198, Japan.
Phys Rev Lett. 2006 Dec 8;97(23):237201. doi: 10.1103/PhysRevLett.97.237201. Epub 2006 Dec 4.
We propose a spectroscopic approach to probe tiny vibrations of a nanomechanical resonator (NAMR), which may reveal classical or quantum behavior depending on the decoherence-inducing environment. Our proposal is based on the detection of the voltage-fluctuation spectrum in a superconducting transmission line resonator (TLR), which is indirectly coupled to the NAMR via a controllable Josephson qubit acting as a quantum transducer. The classical (quantum mechanical) vibrations of the NAMR induce symmetric (asymmetric) Stark shifts of the qubit levels, which can be measured by the voltage fluctuations in the TLR. Thus, the motion of the NAMR, including if it is quantum mechanical or not, could be probed by detecting the voltage-fluctuation spectrum of the TLR.
我们提出了一种光谱方法来探测纳米机械谐振器（NAMR）的微小振动，根据退相干诱导环境的不同，这种振动可能揭示经典或量子行为。我们的方案基于对超导传输线谐振器（TLR）中电压涨落谱的检测，该谐振器通过一个可控的约瑟夫森量子比特作为量子换能器与NAMR间接耦合。NAMR的经典（量子力学）振动会引起量子比特能级的对称（非对称）斯塔克位移，这可以通过TLR中的电压涨落来测量。因此，通过检测TLR的电压涨落谱，可以探测NAMR的运动，包括其是否为量子力学运动。
