What is the true meaning of observing in quantum mechanics?

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Discussion Overview

The discussion revolves around the concept of "observing" in quantum mechanics, particularly in relation to wavefunction collapse and the implications of observation on quantum states. Participants explore the definitions and interpretations of observation, its connection to information, and the role of consciousness.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions the appropriateness of the term "observing," suggesting that human consciousness is not involved in the process of wavefunction collapse.
  • Another participant proposes that observing refers to gathering information, emphasizing that this process is independent of human consciousness but related to the concept of information.
  • A different viewpoint suggests that "observation" involves interaction with the environment, leading to decoherence and the perception of wavefunction collapse, while also raising the question of why a particular branch perceives anything at all.
  • One participant clarifies that in quantum mechanics, observation equates to interaction, which inherently alters experimental outcomes.

Areas of Agreement / Disagreement

Participants express differing interpretations of what constitutes "observation" in quantum mechanics, with no consensus reached on the implications of consciousness or the nature of interaction involved in the process.

Contextual Notes

The discussion highlights various interpretations of quantum mechanics, including the many-world interpretation and Bohmian interpretation, without resolving the underlying questions about observation and consciousness.

Mukilab
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Hi,

Please can anyone tell me what 'observing' means for example when we 'observe' a particle its wavefunction collapses, however surely observation is the wrong word as human conscience has absolutely nothing to do with this.

Any help is greatly appreciated, thank you
 
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I'm no expert, I only have a basic understanding of QM, but I think observing means gathering information about something. It has nothing to do with human consciousness, but it does have something to do with the concept of information. Say a computer program gathers information about a particle and deduces stuff based on that. Its wave function will collapse. The weirdest thing (again, this could be wrong) is that if some sensor picks up stuff and then the information is deleted or made inaccessible before it's gathered by anything, the wave function won't collapse?
 
"Observation" means that the particle interacts with the environment containing many degrees of freedom, which causes decoherence of the particle state. Decoherence can be visualized as a split of the wave function into separate branches which do not communicate with each other. In this way each particular branch perceives the rest of the of the world as if other branches did not exist, which looks like collapse to the branch.

The unsolved problem is why should a particular branch perceive anything in the first place. One of the possibilities is that it DOES have something to do with conscience, but there are other (more "physical" in spirit) possibilities too. The prominent examples of such possibilities are many-world interpretation and Bohmian interpretation.
 
Whenever I hear or read the word "observation" in relation to quantum mechanics, I always take it to really mean "interacting," because in the quantum world, observations can only come about through an interaction. So of course it makes sense that observations change the results of the experiments.
 

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