What is an observable exactly?

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In summary, physicists use various types of equipment, such as photodetectors and magnets, to make quantum measurements. The exact definition of an observable is a Hermitian operator on a given Hilbert space, but there is ongoing debate about whether wave function collapse occurs during measurements.
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dsaun777
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What is an observable exactly? I hear terms that are used in physics books like an observable or a detection. What types of equipment do physicists use to make all these quantum measurements that are used in books so frequently? How small of a region of space does the wave function "collapse" into when measuring particles?
 
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dsaun777 said:
How small of a region of space does the wave function "collapse" into when measuring particles?
Whether wave function collapse happens at all is an open question (different interpretations of quantum mechanics say different things on this topic).
 
  • #3
dsaun777 said:
What types of equipment do physicists use to make all these quantum measurements that are used in books so frequently?
One example of equipment is photodetectors. But there are other types of equipment used, depending on what is studied. Examples of additional equipment: magnets, polarizers, waveplates etc.
 
  • #4
Technically, an observable is just a Hermitian operator on whatever Hilbert space you're working in.
 

1. What is an observable?

An observable is a term used in science to describe a measurable event or phenomenon. It is something that can be observed and recorded.

2. How is an observable different from a variable?

An observable is a specific type of variable that can be measured or observed, while a variable is a broader term that can refer to any quantity or characteristic that can change.

3. What are some examples of observables?

Some examples of observables include temperature, weight, speed, and pH levels. These are all physical quantities that can be measured and observed.

4. How are observables used in scientific experiments?

Observables are often used as a way to collect data and make observations in scientific experiments. By measuring and recording observables, scientists can gather information and draw conclusions about the phenomenon being studied.

5. Can observables be subjective?

No, observables are objective and can be measured and observed in a consistent and repeatable manner. However, the interpretation of the data collected from observables can be subjective and may vary among individuals.

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