Sci & Tech

How the act of measuring a quantum particle transforms it into an on a regular basis object

Constraining quantum measurement
Despite the fuzziness of the quantum world, measurements of quantum particles yield exact outcomes in our on a regular basis world. How does the act of measuring obtain this transformation? Credit: Institute of Physics

The quantum world and our on a regular basis world are very totally different locations. In a publication that appeared because the “Editor’s Suggestion” in Physical Review A this week, UvA physicists Jasper van Wezel and Lotte Mertens and their colleagues examine how the act of measuring a quantum particle transforms it into an on a regular basis object.

Quantum mechanics is the idea that describes the tiniest objects on the earth round us, starting from the constituents of single atoms to small mud particles. This microscopic realm behaves remarkably in a different way from our on a regular basis expertise—even though all objects in our human-scale world are product of quantum particles themselves. This results in intriguing bodily questions: why are the quantum world and the macroscopic world so totally different, the place is the dividing line between them, and what precisely occurs there?

Measurement downside

One explicit space the place the excellence between quantum and classical turns into important is once we use an on a regular basis object to measure a quantum system. The division between the quantum and on a regular basis worlds then quantities to asking how ‘large’ the measurement gadget needs to be to have the ability to present quantum properties utilizing a show in our on a regular basis world. Finding out the main points of measurement, reminiscent of what number of quantum particles it takes to create a measurement gadget, known as the quantum measurement downside.

As experiments probing the world of quantum mechanics develop into ever extra superior and contain ever bigger quantum objects, the invisible line the place pure quantum conduct crosses over into classical measurement outcomes is quickly being approached. In an article, UvA physicists Jasper van Wezel and Lotte Mertens and their colleagues take inventory of present fashions that try to unravel the measurement downside, and significantly those who achieve this by proposing slight modifications to the one equation that guidelines all quantum conduct: Schrödinger’s equation.

Born’s rule

The researchers present that such amendments can in precept result in constant proposals for fixing the measurement downside. However, it seems to be troublesome to create fashions that fulfill Born’s rule, which tells us the right way to use Schrödinger’s equation for predicting measurement outcomes. The researchers present that solely fashions with ample mathematical complexity (in technical phrases: fashions which are non-linear and non-unitary) may give rise to Born’s rule and subsequently have an opportunity of fixing the measurement downside and instructing us in regards to the elusive crossover between quantum physics and the on a regular basis world.


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More data:
Lotte Mertens et al, Inconsistency of linear dynamics and Born’s rule, Physical Review A (2021). DOI: 10.1103/PhysRevA.104.052224

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University of Amsterdam

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How the act of measuring a quantum particle transforms it into an on a regular basis object (2021, November 30)
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from https://phys.org/information/2021-11-quantum-particle-everyday.html

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