论文标题
可靠量子光学计量学的双端口测量
Double-port measurements for robust quantum optical metrology
论文作者
论文摘要
已经提出并证明了路径键入的Fock状态（PEFSS）在中午国家的光子损失方面具有稳健性[S. D. Huver \ emph {et al。}，物理。修订版A \ textbf {78}，063828（2008）]。但是，演示是基于尚未在实验中实施的测量方案。在这项工作中，我们通过分析计算量子Fisher信息来定量说明在存在光子损失的情况下，PEFS在中午状态上的优势。为了在实践中实现这种优势，我们通过采用三种可行的测量方法来研究可实现的敏感性：平等，光子数分辨率和同伴测量值。我们在这里采用双端口测量策略，其中使用上述测量值同时检测干涉仪的每个输出端口的光子。
It has been proposed and demonstrated that path-entangled Fock states (PEFSs) are robust against photon loss over NOON states [S. D. Huver \emph{et al.}, Phys. Rev. A \textbf{78}, 063828 (2008)]. However, the demonstration was based on a measurement scheme which was yet to be implemented in experiments. In this work, we quantitatively illustrate the advantage of PEFSs over NOON states in the presence of photon losses by analytically calculating the quantum Fisher information. To realize such an advantage in practice, we then investigate the achievable sensitivities by employing three types of feasible measurements: parity, photon-number-resolving, and homodyne measurements. We here apply a double-port measurement strategy where the photons at each output port of the interferometer are simultaneously detected with the aforementioned types of measurements.
