论文标题
量子照明的基本限制
Fundamental limits of quantum illumination
论文作者
论文摘要
在量子照明（QI）中，最初与在接收器处固定的惰轮纠缠的信号光束会询问在热背景光中沐浴的目标区域。与惰轮共同测量返回的光束，以确定是否存在弱反射目标。使用量子信息理论中的工具，我们在检测镜面和褪色靶标的平均误差概率以及估计检测到的目标反射率的平方平方误差的平均误差概率上得出了下限，该误差估计了检测到的靶标的反射率，这些QI发射器都满足信号能量限制。对于明亮的热背景，我们表明使用多个低亮度两种模式挤压真空状态的Qi系统几乎是最佳的。更普遍地，我们的结果将使用QI系统在所有波长以及所有信号和背景噪声水平上实现的最佳性能限制。
In Quantum Illumination (QI), a signal beam initially entangled with an idler beam held at the receiver interrogates a target region bathed in thermal background light. The returned beam is measured jointly with the idler in order to determine whether a weakly reflecting target is present. Using tools from quantum information theory, we derive lower bounds on the average error probability of detecting both specular and fading targets and on the mean squared error of estimating the reflectance of a detected target, which are obeyed by any QI transmitter satisfying a signal energy constraint. For bright thermal backgrounds, we show that the QI system using multiple copies of low-brightness two-mode squeezed vacuum states is nearly optimal. More generally, our results place limits on the best possible performance achievable using QI systems at all wavelengths, and at all signal and background noise levels.
