Quantum mechanics reimagined: Imaginary numbers may not be essential after all

A team of researchers has challenged a fundamental assumption in quantum mechanics. Their work suggests that quantum states can be described without relying on imaginary numbers, a long-standing convention in the field. The study was led by Professor Dr. Dagmar Bruß and Pedro Barrios Hita from DLR and HHU. They proposed a new approach that uses only real numbers to describe quantum states, breaking from the traditional use of complex numbers with both real and imaginary parts.

Their findings show that this alternative method maintains full consistency with standard quantum mechanics. Both frameworks produce the same predictions for any possible experiment, meaning the new approach does not compromise accuracy.

The American Physical Society recognised the importance of this work by featuring it as a 'Highlight' in Physics Magazine. The research implies that imaginary numbers, while useful, may not be a fundamental requirement for understanding quantum systems. This new formulation offers a potentially more intuitive way to grasp quantum mechanics. It demonstrates that complex numbers can be replaced with real-number alternatives without altering experimental outcomes. The work opens doors for rethinking how quantum systems are mathematically represented.