Explaining quantum coherence to a layman

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Explaining quantum coherence to a lay audience can be challenging, especially for those with limited physics background. Visual analogies, such as the constructive and destructive interference of waves, are effective for illustrating the concept. Another useful analogy involves comparing wave packet rephasing to people racing around a track at different speeds, converging at the starting point over time. Suggestions for additional visual aids, like using arrows in a large space, may help clarify these concepts further. Engaging and relatable explanations are key to making quantum coherence accessible to diverse disciplines.
Einstein Mcfly
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Hey folks. I'm giving a poster at a conference in a month or so and I'm supposed to explain my research (optimal control of quantum systems in dissipative environments) to people from many other disciplines (psychology, biology, etc). I'd like to hear any tips those on this board have on how to explain quantum coherence to people who may have never had more than high school physics, if that.

There is always the pictorial representation of adding two waves constructively to get a larger amplitude or destructively to get a smaller one, but that's the best I can think of so far. As for wave packet rephasing, there is the analogy of people racing around a track at speeds that are integer multiples of one another and showing that at a certain time later they'll all be at the starting point together.

Other ideas? Thanks in advance.
 
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Einstein Mcfly said:
Other ideas? Thanks in advance.

Adding arrows in a large space ?
 
Time reversal invariant Hamiltonians must satisfy ##[H,\Theta]=0## where ##\Theta## is time reversal operator. However, in some texts (for example see Many-body Quantum Theory in Condensed Matter Physics an introduction, HENRIK BRUUS and KARSTEN FLENSBERG, Corrected version: 14 January 2016, section 7.1.4) the time reversal invariant condition is introduced as ##H=H^*##. How these two conditions are identical?

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