论文标题
一类非线性放大器的噪声限制
Quantum limits on noise for a class of nonlinear amplifiers
论文作者
论文摘要
诸如晶体管之类的非线性放大器在古典技术中无处不在，但是它们的量子类似物尚不清楚。我们引入了一类非线性放大器，这些放大器会放大任何正常的操作员，并在输出处添加半Quantum的真空噪声。在大增益极限中，当与嘈杂的线性检测器结合使用时，这些放大器实现了正常运算符的理想测量值。
Nonlinear amplifiers such as the transistor are ubiquitous in classical technology, but their quantum analogues are not well understood. We introduce a class of nonlinear amplifiers that amplify any normal operator and add only a half-quantum of vacuum noise at the output. In the large-gain limit, when used in conjunction with a noisy linear detector, these amplifiers implement ideal measurements of the normal operator.
