The delayed choice experiment is a thought experiment in quantum mechanics that explores the wave-particle duality of light and the role of measurement and observation in determining its behavior. While the experiment raises interesting questions about the nature of reality, it does not provide direct evidence supporting John Wheeler's idea that reality is created by the observer.
In the delayed choice experiment, light can be observed to behave either as a particle or a wave depending on how the experiment is set up. The key idea is that the observer's choice of whether to measure the wave or particle properties of light affects the outcome of the experiment. This suggests that the act of measurement or observation has a significant influence on the behavior of quantum particles.
However, it is important to note that this effect is observed at the quantum level and does not necessarily extend to the macroscopic world. While quantum mechanics has been very successful in describing the behavior of particles at the microscopic scale, it does not provide a complete description of reality at the macroscopic level. The notion that reality is created solely by the observer is not widely accepted in the scientific community and is more of a philosophical interpretation of quantum mechanics.
It is worth mentioning that interpretations of quantum mechanics, such as the Copenhagen interpretation or the many-worlds interpretation, offer different explanations for the observations in the delayed choice experiment. These interpretations provide different ways of understanding the behavior of quantum particles, but none of them definitively prove that reality is created by the observer.
In summary, while the delayed choice experiment raises intriguing questions about the role of observation and measurement in quantum mechanics, it does not offer direct evidence to support the idea that reality is created by the observer. This concept remains a topic of philosophical speculation and interpretation rather than a scientifically established fact.