Kvanttimääryst

Kvanttimääryst is a Finnish term that translates to "quantum measurement" in English. It refers to the process of obtaining information about a quantum mechanical system. In quantum mechanics, measurement is not a passive observation as it is in classical physics. Instead, the act of measurement fundamentally influences the state of the system being measured.

Before a measurement, a quantum system can exist in a superposition of multiple states simultaneously. For example, an electron's spin can be both "up" and "down" at the same time until measured. When a measurement is performed, the system is forced to collapse into one definite state. The outcome of this collapse is probabilistic, governed by the probabilities associated with each possible state in the superposition.

The measurement problem in quantum mechanics is a long-standing theoretical challenge that explores the nature of this collapse and the transition from quantum superposition to definite classical outcomes. Different interpretations of quantum mechanics offer varying explanations for this phenomenon. Key concepts related to kvanttimääryst include wave function collapse, observable quantities, and the uncertainty principle, which states that certain pairs of physical properties, like position and momentum, cannot be simultaneously known with arbitrary precision. The act of measuring one property inevitably disturbs the other.