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arXiv 1808.02673cond-mat.mes-hallquant-ph
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声子数敏感电动力学

Phonon number sensitive electromechanics

Jeremie J. Viennot, Xizheng Ma, Konrad W. Lehnert

摘要:

我们利用微波超导量子比特的强固有非线性,具有4 GHz的过渡频率,直接检测和控制的微机械振荡器的能量振动在25 MHz。量子位和振荡器以大约$2π\times$ 22 MHz的速率静电耦合。在这种远离谐振的状态下,量子比特频率被移动了0.52 MHz/振荡器声子,或者大约是3.7 MHz量子比特线宽的14%。量子位表现为振动能量检测器,从它的线形,我们提取的振子的声子数分布。我们操纵这种分布驱动数态敏感的边带跃迁,并创造深刻的非热状态。最后,通过驱动较低频率的边带跃迁,我们冷却振荡器,并增加其基态人口高达0.48 $\pm$ 0.13,接近8倍以上的值在热平衡。这些结果表明,一类新的机电实验,是一个有前途的策略,量子非爆破测量和非经典态制备。

英文摘要:

We use the strong intrinsic non-linearity of a microwave superconducting qubit with a 4 GHz transition frequency to directly detect and control the energy of a micro-mechanical oscillator vibrating at 25 MHz. The qubit and the oscillator are coupled electrostatically at a rate of approximately $2π\times$22 MHz. In this far off-resonant regime, the qubit frequency is shifted by 0.52 MHz per oscillator phonon, or about 14 % of the 3.7 MHz qubit linewidth. The qubit behaves as a vibrational energy detector and from its lineshape we extract the phonon number distribution of the oscillator. We manipulate this distribution by driving number state sensitive sideband transitions and creating profoundly non-thermal states. Finally, by driving the lower frequency sideband transition, we cool the oscillator and increase its ground state population up to 0.48$\pm$0.13, close to a factor of 8 above its value at thermal equilibrium. These results demonstrate a new class of electromechanics experiments that are a promising strategy for quantum non-demolition measurements and non-classical state preparation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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