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A piezoelectric "tuning fork" has been constructed, which can be placed into a superposition of vibrating and non vibrating states. The resonator comprises about 10 trillion atoms. [34] Smolin, Lee (October 2012). "A real ensemble interpretation of quantum mechanics". Foundations of Physics. 42 (10): 1239–1261. arXiv: 1104.2822. Bibcode: 2012FoPh...42.1239S. doi: 10.1007/s10701-012-9666-4. ISSN 0015-9018. S2CID 118505566.

In Schrödinger's original formulation, a cat, a flask of poison, and a radioactive source are placed in a sealed box. If an internal radiation monitor (e.g. a Geiger counter) detects radioactivity (i.e. a single atom decaying), the flask is shattered, releasing the poison, which kills the cat. The Copenhagen interpretation implies that, after a while, the cat is simultaneously alive and dead. Yet, when one looks in the box, one sees the cat either alive or dead, not both alive and dead. This poses the question of when exactly quantum superposition ends and reality resolves into one possibility or the other.

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a b Hobson, Art (2017). Tales of the Quantum: Understanding Physics' Most Fundamental Theory. New York, NY: Oxford University Press. pp.200–202. ISBN 9780190679637 . Retrieved April 8, 2022. Okon, Elias; Sudarsky, Daniel (2014-02-01). "Benefits of Objective Collapse Models for Cosmology and Quantum Gravity". Foundations of Physics. 44 (2): 114–143. arXiv: 1309.1730. Bibcode: 2014FoPh...44..114O. doi: 10.1007/s10701-014-9772-6. ISSN 1572-9516. S2CID 67831520. Speaker Nancy Pelosi seemingly concedes that the articles of impeachment are just a low opening bid to get the game going.

The relational interpretation makes no fundamental distinction between the human experimenter, the cat, and the apparatus or between animate and inanimate systems; all are quantum systems governed by the same rules of wavefunction evolution, and all may be considered "observers". But the relational interpretation allows that different observers can give different accounts of the same series of events, depending on the information they have about the system. [25] The cat can be considered an observer of the apparatus; meanwhile, the experimenter can be considered another observer of the system in the box (the cat plus the apparatus). Before the box is opened, the cat, by nature of its being alive or dead, has information about the state of the apparatus (the atom has either decayed or not decayed); but the experimenter does not have information about the state of the box contents. In this way, the two observers simultaneously have different accounts of the situation: To the cat, the wavefunction of the apparatus has appeared to "collapse"; to the experimenter, the contents of the box appear to be in superposition. Not until the box is opened, and both observers have the same information about what happened, do both system states appear to "collapse" into the same definite result, a cat that is either alive or dead. That’s not how it works. The House is supposed to pass such a serious matter upon proof, not wishful thinking by those followers of the Schrodinger’s pussy theory. Patekar, Kartik; Hofmann, Holger F. (2019). "The role of system–meter entanglement in controlling the resolution and decoherence of quantum measurements". New Journal of Physics. 21 (10): 103006. arXiv: 1905.09978. Bibcode: 2019NJPh...21j3006P. doi: 10.1088/1367-2630/ab4451.a b Levin, Frank S. (2017). Surfing the Quantum World. New York, NY: Oxford University Press. pp.229–232. ISBN 978-0-19-880827-5 . Retrieved April 8, 2022. Schrödinger's Cat Now Made Of Light". www.science20.com. 27 August 2014. Archived from the original on 18 March 2012.

To further illustrate, Schrödinger described how one could, in principle, create a superposition in a large-scale system by making it dependent on a quantum particle that was in a superposition. He proposed a scenario with a cat in a closed steel chamber, wherein the cat's life or death depended on the state of a radioactive atom, whether it had decayed and emitted radiation or not. According to Schrödinger, the Copenhagen interpretation implies that the cat remains both alive and dead until the state has been observed. Schrödinger did not wish to promote the idea of dead-and-live cats as a serious possibility; on the contrary, he intended the example to illustrate the absurdity of the existing view of quantum mechanics. [1]According to at least one proposal, it may be possible to determine the state of the cat before observing it. [37] [38] Extensions In 1957, Hugh Everett formulated the many-worlds interpretation of quantum mechanics, which does not single out observation as a special process. In the many-worlds interpretation, both alive and dead states of the cat persist after the box is opened, but are decoherent from each other. In other words, when the box is opened, the observer and the possibly-dead cat split into an observer looking at a box with a dead cat and an observer looking at a box with a live cat. But since the dead and alive states are decoherent, there is no effective communication or interaction between them.