Science Daily April 2, 2018
Researchers in Switzerland used sequences of multiple periodic position and momentum measurements to demonstrate that varying the period controls whether one measurement disturbs the state of the following one. At specific values of the period, they found that such measurements can avoid disturbance, whereas other choices produce strong disturbance. Modular position and momentum measurement are central components of several proposals for quantum computing and precision-measurement protocols that exploit periodic functions of position and momentum to escape Heisenberg’s uncertainty principle. The research provides a fundamental ingredient — measurement — for such applications, thus bringing them closer into reach… read more. Open Access TECHNICAL ARTICLE
The uncertainty, however, can be ‘spread out’ in broad comb-like structures, where each tooth is still relatively sharp, thus enabling precise measurements in a limited range. Credit: Christa Flühmann, ETH Zurich