# Quantum Mechanics May Not Need Imaginary Numbers After All New research suggests quantum theory can be formulated using only real numbers. - **Source:** [Latest Science News -- ScienceDaily](https://brifing.si/source/0eef8637-6c5b-4e79-8f5b-6c9c6b36cf16) - **Published:** 2026-07-13 - **Topic:** [Data & AI](https://brifing.si/c/data-ai) - **Original article:** - **On Brifing:** https://brifing.si/s/7b405ee4-48dd-44a1-957a-f0077b8b4332 ## Foundations of Quantum Mechanics Quantum mechanics explains the behavior of matter and energy at the atomic and subatomic scale. Developed in the early 1900s by Max Planck, Niels Bohr, and others, it successfully describes microscopic phenomena such as the double-slit experiment and quantum tunneling. ## Role of Imaginary Numbers Quantum mechanics is formulated using complex numbers, which consist of real and imaginary components. The real part represents amplitude, while the imaginary part represents phase. This mathematical framework has long been considered fundamental for describing quantum processes. ## Debates and Questions Physicists have debated whether complex numbers are a fundamental part of nature or merely a convenient mathematical tool. This debate has raised the question of whether quantum mechanics can be formulated using only real numbers. ## Findings of the 2021 Study A 2021 study concluded that complex numbers are indispensable under the standard postulates of quantum mechanics. Experimental results supported this finding. However, the assumptions of this study began to be questioned. ## Findings of the New Research Researchers from Heinrich Heine University and the German Aerospace Center re-examined the assumptions of the 2021 study. Using a new, physically motivated approach, they identified theories that can be expressed entirely with real numbers. ## Conclusion and Implications These new theories are experimentally indistinguishable from conventional quantum mechanics. This finding suggests that imaginary numbers are not fundamentally necessary in quantum mechanics and can be replaced by alternative formulations. ## Sources covering this story - https://www.sciencedaily.com/releases/2026/07/260713000807.htm — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._