You may wonder, what do I mean by objective reality doesn’t exist? In the quantum world, the observation is subjective and for example, two different observations on the same experiment give a different result and yet both are correct. The particles in the quantum world are at different places at the same time. I know this sounds strange. I mean when you compare with real-life example it would sound crazy.
It is like saying that a glass of water which “is” on the table is somewhere else as well. This sound crazy right? I mean the glass of water is either on the table or somewhere else. It cannot be at two places (or several for that matter) at the same time. This is what is happening in the quantum world. Quantum computers are based on this fact.