One way to achieve that is by adding a feedback term, which is proportional to the particle's position ( u f b ( t ) ∝ ∝ q ˙ ˙ ( t ) ). Since that mechanism provides damping, which cools down the mechanical motion, without the introduction of fluctuations, it is referred to as “cold damping”. The first experiment employing this type of cooling was done in 1977 by Arthur Ashkin, who received the 2018 Nobel Prize in Physics for his pioneering work on trapping with optical tweezers.