<story><title>Computer scientists prove that heat destroys quantum entanglement</title><url>https://www.quantamagazine.org/computer-scientists-prove-that-heat-destroys-entanglement-20240828/</url></story><parent_chain><item><author>danbruc</author><text>A similar result for superposition would be huge, I guess, after a century we could finally understand what qualifies as a measurement device, why we do not observe quantum effects at macroscopic scales, what actually saves or kills Schrödinger&amp;#x27;s cat.</text></item></parent_chain><comment><author>sebzim4500</author><text>There&amp;#x27;s a result in quantum information that demonstrating a superposition of two states is at least as hard as switching between those states.&lt;p&gt;So designing an experiment to show that a cat is in a superposition of alive and dead is at least as hard as bringing a dead cat back to life (obviously in real life it would be much harder, this is just a lower bound).</text></comment>
<story><title>Computer scientists prove that heat destroys quantum entanglement</title><url>https://www.quantamagazine.org/computer-scientists-prove-that-heat-destroys-entanglement-20240828/</url></story><parent_chain><item><author>danbruc</author><text>A similar result for superposition would be huge, I guess, after a century we could finally understand what qualifies as a measurement device, why we do not observe quantum effects at macroscopic scales, what actually saves or kills Schrödinger&amp;#x27;s cat.</text></item></parent_chain><comment><author>marginalia_nu</author><text>We have this result already.  Interaction with thermal noise ruins wave coherence, and causes classical physics to emerge.  This comes when you in a sense replace waves with their average values.&lt;p&gt;It&amp;#x27;s not so much a question of scale, but of statistical noisiness. Quantum effects are primarily observable in the low-temperature domain (this is not necessarily &amp;quot;thermometer temperature&amp;quot;, but a statistical measure)</text></comment>