What is a Quantum Object?

An Approach Based on Thisness Bundle Theory

Abstract

What is a quantum object? According to individualism, quantum objects are treated as individual objects. Therefore, we can count quantum objects because they are distinct individuals. However, if the individuality of a quantum object is given by its substratum, or primitively, the object would possess a definite position, which contradicts the orthodox interpretation of quantum mechanics. Given this situation, I propose that quantum objects should be regarded as “indefinite multi-located individuals.” A quantum object can exist wholly at multiple locations simultaneously but is probabilistically located with respect to each of those locations. This view is based on the following metaphysical framework: the ontology of thisness bundle theory for quantum objects, and the ideology of property (co-)instantiation with probability.