Scientists have transformed noisy, amplified lasers into ultra-stable quantum light beams with fluctuations below classical limits.

Abstract: This paper presents a method for the weighted least-squares approximation of finite impulse response (FIR) filters by infinite impulse response (IIR) filters. It is shown, how a solution to ...

Structured least squares (SLS) is a new algorithm that solves the invariance equation by preserving its structure. Formally, SLS is derived as a linearized iterative solution of a nonlinear ...