What Is Local Realism in Quantum Mechanics?
Local realism in quantum mechanics asserts that objects possess definite properties independent of measurement, which are localized in space.
Takeways• Local realism means objects have definite, pre-existing properties.
• These properties are localized in space and exist independently of measurement.
• Defining 'real' or 'existence' philosophically is complex, but assumed for local realism.
Local realism posits that objects in space have intrinsic, definite properties that exist prior to and independent of any measurement, even if the precise definition of 'real' or 'existence' remains a philosophical challenge. These pre-existing properties interact with measuring devices, which either passively reveal them or engage in a more subtle interplay, establishing an ontology for the physical state of being.
Defining Local Realism
• 00:00:03 Local realism describes the concept that objects localized in space possess definite properties that exist inherently, independent of measurement. These properties are considered 'real' in some sense, meaning they are a definite way that the object is, interacting with measuring devices to yield results. The debate around 'real' versus 'definite' emphasizes the pre-existing nature of these attributes.
Challenges in Definition
• 00:01:05 Defining fundamental concepts like 'real' or 'existence' presents significant philosophical challenges, often leading to circular definitions similar to those encountered with notions like probability, consciousness, or free will. Despite these difficulties, local realism proceeds by assuming a prior understanding of what it means for things to be real, asserting that objects have pre-existing, definite properties separate from what is observed during measurement.