![]() ![]() The previous way was easier to use, and the distinction between the two approaches hasn’t even been relevant to the kinds of research scientists have been doing. ![]() Lead author Wojciech Górecki is careful to point out his team’s work isn’t meant to cast aspersions at previous working models of the Heisenberg limit. The generally accepted Heisenberg limit is based on a frequentist approach to probability, but these scientists have introduced a new limit based on the competing Bayesian approach they say is more effective for noiseless systems. Quantum systems either have quantum noise (a kind of quantified uncertainty) or are “noiseless,” and this is where the Heisenberg limit comes in. (Yep, that's a mouthful.) For each new instrument or procedure for a relevant field like interferometry, there’s a “classical” way to measure and a newer, quantum-based one. In fields like quantum physics, the phenomena being measured are so micro-tiny that scientists have had to invent not just new ways to measure but also ways to measure how much their measuring is distorting the measurement. Why the World's Measuring Systems Just Changed In classical and quantum thermodynamics, a trade-off between speed, precision and cost is of relevance for problems in open quantum dynamics and various biomolecular processes.In most fields, “measuring” doesn’t seem like it warrants its own dedicated area of study, although the so-called new kilogram (itself a quantum measure!) and other stories like it do show us that to measure is human and to re-measure is divine. Metrology is the study of measures, the same root as meter or metric. You can basically hear an ominous Greek chorus as you read in their abstract, “This leads to the ultimate formulation of the Heisenberg limit for quantum metrology.” In a 2012 paper in Physical Review A, scientists wrote, “For the last 20 years, the question of what are the fundamental capabilities of quantum precision measurements has sparked a lively debate throughout the scientific community.” Indeed, even then, the researchers claimed to have a definitive metric. That influence is the Heisenberg limit, but scientists are still homing in on a firm way to calculate it. This little-understood number tries to quantify how quantum systems and phenomena are physically measured, because the numbers are influenced by the presence of the means of measurement themselves. Researchers in Poland and Australia have collaborated on a new paper redefining the Heisenberg limit. Noiseless quantum systems are the main target for the new form of Heisenberg limit.The frequentist-Bayesian divide permeates fields from statistics to A.I.Switching from frequentist to Bayesian calculation may have led to a finer Heisenberg limit. Its Heisenbergs uncertainty principle: If you want to locate a particle you cant at the same time determine its, to put it perhaps over-simply, velocity. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |