标题： 使用压缩准贝尔态的量子相位估计 显示英文标题

标题： Quantum phase estimation using squeezed quasi-Bell states

摘要： 本文研究了利用连续变量纠缠压缩相干态（准贝尔态）作为探针态的量子相位估计算法问题。我们表明，它们固有的压缩和纠缠特性可能带来优势，在线性（幺正）扰动和耗散条件下，与使用其他连续变量态（例如两模纠缠相干态或单模压缩态）的协议相比，可以提高相位估计的精度。我们还分析了在存在线性（幺正）扰动和耗散的情况下，相位估计过程，并得出结论：即使在非理想条件下，使用纠缠压缩相干态作为探针态仍可能具有优势。 显示英文摘要

摘要： In this paper we present a study of the quantum phase estimation problem employing continuous-variable, entangled squeezed coherent (quasi-Bell) states as probe states. We show that their inherent squeezing and entanglement properties might bring advantages, increasing the precision of phase estimation compared to protocols which employ other continuous variable states e.g., two-mode, entangled coherent states or single-mode, squeezed states. We also analyze the phase estimation process considering: i) a linear (unitary) perturbation, and ii) dissipation, and conclude that the use of entangled squeezed coherent states as probe states may still be advantageous even under non-ideal conditions.