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How the act of measuring a quantum particle transforms it into an everyday object

Despite the ambiguity of the quantum world, quantum particle measurements give accurate results in our everyday world. How does the act of measurement achieve this change? Credits: Institute of Physics

The quantum world and our everyday world are very different places.In a publication that appeared as an “editor’s suggestion” Physical Review A This week, UvA physicists Jaspervan Wesel and Lotte Mertens and their colleagues will investigate how the act of measuring quantum particles transforms it into everyday objects.


Quantum mechanics is the theory that describes the smallest objects in the world around us, from the constituents of a single atom to the particles of small dust. This microscopic region behaves significantly differently from our everyday experience, despite the fact that all objects in the human-scale world are made up of quantum particles themselves.This leads to an intriguing physical question: why Quantum world And the macroscopic worlds are so different, where are the boundaries between them, and what exactly happens there?

Measurement problem

One of the specific areas where the distinction between Quantum and Classic is essential is when using everyday. object Measure the quantum system.The division between the quantum world and the everyday world will ask how “big” it is. Measuring instrument We need to be able to use displays to display quantum properties in our everyday world. Knowing the details of a measurement, such as the number of quantum particles needed to make a measuring device, is called a quantum measurement problem.

As an experiment to explore the world of Quantum mechanics With increasing sophistication and the involvement of larger and larger quantum objects, pure quantum behavior is rapidly approaching invisible lines that intersect classical measurements. In the article, UvA physicists Jaspervan Wesel and Lotte Meltens and their colleagues propose minor modifications to the current model that seeks to solve measurement problems, especially the one equation that governs all quantum behaviors. I am considering a model that I try to solve by: Schrodinger equation.

Born rule

Researchers have shown that such modifications can, in principle, lead to consistent suggestions for solving measurement problems. However, it turned out to be difficult to create a model that meets the Born rule, which shows how to use the Schrodinger equation to predict measurement results. Researchers have found that only models with sufficient mathematical complexity (technical term: non-linear, non-single model) can give rise to the Born rule, thus solving measurement problems and elusive crosses. It shows that we have the opportunity to teach us about over-quantum physics and the everyday world.


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For more information:
Lotte Mertens et al, contradiction between linear dynamics and Born rule, Physical Review A (2021). DOI: 10.1103 / PhysRevA.104.052224

Quote: How the act of measuring quantum particles transforms it into everyday objects (2021, November 30) is from https://phys.org/news/2021-11-quantum-particle-everyday.html to 2021 Obtained on November 30, 2014.

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How the act of measuring a quantum particle transforms it into an everyday object

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