相位噪声对玻色约瑟夫森结中有用量子关联的影响
Effect of phase noise on useful quantum correlations in Bose Josephson junctions
摘要：
在双模玻色约瑟夫森结中，由隧道振幅突然猝灭引起的动力学导致周期性纠缠态的形成。例如，压缩态在短时间内形成，而相态的宏观叠加在稍后的时间内形成。结的两个模式可以被看作是干涉仪的两个臂;使用纠缠态可以进行超越经典极限的原子干涉。由于噪声的存在，退相干降低了原子之间的量子相关性，从而降低了干涉仪的相位灵敏度。我们考虑由结的两个模式的能量的随机涨落引起的噪声。我们分析了它对压缩态和宏观叠加态的影响，并定量地研究了量子关联的数量，它可以用来提高相对于经典极限的相位灵敏度。为此，我们计算了猝灭动力学过程中的压缩参数和量子费舍尔信息。对于中等的噪声强度，我们表明，这些有用的量子相关性的时间尺度上的压缩制度以外的增加。这表明多组分叠加作为高精度原子干涉测量的有趣的候选者。
英文摘要：
In a two-mode Bose Josephson junction the dynamics induced by a sudden quench of the tunnel amplitude leads to the periodic formation of entangled states. For instance, squeezed states are formed at short times and macroscopic superpositions of phase states at later times. The two modes of the junction can be viewed as the two arms of an interferometer; use of entangled states allows to perform atom interferometry beyond the classical limit. Decoherence due to the presence of noise degrades the quantum correlations between the atoms, thus reducing phase sensitivity of the interferometer. We consider the noise induced by stochastic fluctuations of the energies of the two modes of the junction. We analyze its effect on squeezed states and macroscopic superpositions and study quantitatively the amount of quantum correlations which can be used to enhance the phase sensitivity with respect to the classical limit. To this aim we compute the squeezing parameter and the quantum Fisher information during the quenched dynamics. For moderate noise intensities we show that these useful quantum correlations increase on time scales beyond the squeezing regime. This suggests multicomponent superpositions as interesting candidates for high-precision atom interferometry.
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。
