## Comments about "Quantum superposition" in Wikipedia

This document contains comments about the article Quantum superposition in Wikipedia
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In the last paragraph I explain my own opinion.

### Introduction

The article starts with the following sentence.
It states that, much like waves in classical physics, any two (or more) quantum states can be added together ("superposed") and the result will be another valid quantum state; and conversely, that every quantum state can be represented as a sum of two or more other distinct states.
This is mathematical easy but physical tricky. Specific the second half of the sentence.
An example of a physically observable manifestation of superposition is interference peaks from an electron wave in a double-slit experiment.
In the double slit experiment the issue is the interference peaks observed when individual particles go through the double-slit. Mathematically this can be described as a supperposition of two waves, but physical there is no wave.

### 2 Experiments and applications

Successful experiments involving superpositions of relatively large (by the standards of quantum physics) objects have been performed.
The issue is how superpositions are measured.

### 4. Physical interpretation

It is natural to ask why ordinary everyday objects and events do not seem to display quantum mechanical features such as superposition. Indeed, this is sometimes regarded as "mysterious", for instance by Richard Feynman
How can you answer a question when the question is not clear?
What means superposition?
In 1935, Erwin Schrödinger devised a well-known thought experiment, now known as Schrödinger's cat, which highlighted this dissonance between quantum mechanics and classical physics.
This thought experiment is tricky because the answer can only be found when you perform the experiment in reality.
The modern view is that this mystery is explained by quantum decoherence.
That means you solve the mystery by creating a new mystery.

Following is a list with "Comments in Wikipedia" about related subjects

### Reflection 1 - Superposition

There is a hugh difference between what is called superposition with a double slit experiment and the Schrödinger Cat (thought) experiment.
The issue is that the double slit experiment is very easy to perform to show interference but the the Schrödinger Cat experiment not. The last to show that the cat is in both states at the same time.

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Created: 28 July 2017
Updated: 28 October 2017

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