Similar to that in the Schrodinger's cat thought experiment the cat remains in superposition unless observed by an observer, also in the double slit experiment an electron is passing through both the slits until we observe one of it. Therefore, does an observer make significance in the outcome of quantum events.

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    $\begingroup$ Hi Ajinkya, your title imo, does not reflect your question, by the "state of observer", instead do you mean the "presence of an observer". Also, I think there will be lots of duplicates of this question, the answer to which really depends on which interpretation of QM you find most persuasive. en.wikipedia.org/wiki/Interpretations_of_quantum_mechanics $\endgroup$ – user154420 Jul 7 '17 at 18:48
  • $\begingroup$ yes I tried searching the sites but didnt found any duplicates. $\endgroup$ – Ajinkya Naik Jul 8 '17 at 5:31

The answer is ultimately yes, but the definition of observer in quantum mechanics is counterintuitively far from its colloquial definition, which is typically taken as "some conscious entity that does not interfere with a process." Instead, a quantum-mechanical observer is anything that interacts with a quantum system in such a way as to extract information from that system.

When you substitute the quantum-mechanical definition of observer in your statement, it reads: "Quantum systems are influenced by things that interact with them," which is now obviously true.

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    $\begingroup$ This answer is good but it leaves out an important point. Interaction with the environment (i.e. decoherence) explains why the system's density matrix diagonalizes, but it doesn't explain why we see one of the possible results represented by the diagonal terms in that density matrix. $\endgroup$ – DanielSank Jul 8 '17 at 6:39
  • $\begingroup$ It means that the Standard Quantum Results are always the same, but is breached in different ways for different observers, the observers would not influence the outcome or the effects caused due to Quantum Events. $\endgroup$ – Ajinkya Naik Jul 8 '17 at 8:07
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    $\begingroup$ @AjinkyaNaik Not entirely sure how you got that from my answer... $\endgroup$ – probably_someone Jul 8 '17 at 8:18
  • $\begingroup$ I dont know but your answer didnt satisfied me, how can an observer interact with Quantum Systems and change its results $\endgroup$ – Ajinkya Naik Jul 8 '17 at 8:19
  • $\begingroup$ I meant to say consciousness cannot change the outcomes of Quantum Events. $\endgroup$ – Ajinkya Naik Jul 8 '17 at 8:20

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