论文标题
双频照明：量子增强协议
Bi-frequency illumination: a quantum-enhanced protocol
论文作者
论文摘要
提出了在嘈杂和有损场景中测量目标对象对探针频率的响应的量子增强的，无怠速的传感协议。在此协议中，考虑了嵌入热浴中的频率依赖性反射率的靶标。目的是估算参数$λ=η（ω_2）-η（ω_1）$，因为它包含有关不同问题的相关信息。为此，将双频量子状态用作资源，因为有必要捕获有关参数的相关信息。在假定的$λ\ sim 0 $中，计算量子渔民信息$ h $相对于参数$λ$用于两种模式挤压状态（$ h_q $），并且连贯的状态（$ h_c $），估计$λ$。这种量子增强以探测对象的平均反射率而增长，并且具有噪声弹性。显式公式是为最佳可观察物而得出的，并提出了基于基本量子光学转换的实验方案。此外，这项工作为雷达和医学成像中的应用开辟了道路，尤其是在微波域中。
Quantum-enhanced, idler-free sensing protocol to measure the response of a target object to the frequency of a probe in a noisy and lossy scenario is proposed. In this protocol, a target with frequency-dependent reflectivity embedded in a thermal bath is considered. The aim is to estimate the parameter $λ= η(ω_2)-η(ω_1)$, since it contains relevant information for different problems. For this, a bi-frequency quantum state is employed as the resource, since it is necessary to capture the relevant information about the parameter. Computing the quantum Fisher information $H$ relative to the parameter $λ$ in an assumed neighborhood of $λ\sim 0$ for a two-mode squeezed state ($H_Q$), and a coherent state ($H_C$), a quantum enhancement is shown in the estimation of $λ$. This quantum enhancement grows with the mean reflectivity of the probed object, and is noise-resilient. Explicit formulas are derived for the optimal observables, and an experimental scheme based on elementary quantum optical transformations is proposed. Furthermore, this work opens the way to applications in both radar and medical imaging, in particular in the microwave domain.
