Schrödinger's cat

English

Alternative forms

• Schrödinger cat, Schrodinger's cat, Schrodinger cat, Schroedinger's cat, Schroedinger cat

Etymology

Named after Austrian physicist Erwin Schrödinger (1887–1961).

Noun

Schrödinger's cat (plural Schrödinger's cats)

A depiction of the Schrödinger's cat (sense 1). Here the cat might be poisoned to death if a Geiger counter detects nuclear radiation; it might be alive vice versa.

1. A hypothetical cat that is depicted as being surrounded by perfectly uncertain circumstances that make an external observer absolutely unable to deem the cat either alive or dead, especially if the possibilities of survival of the cat are expected to be analysed from the point of view of quantum mechanics. Typically, these circumstances involve the cat being inside a box while being the victim of a danger that may or may not kill it, such as radiation.
   • 2000, Thalia Field, Point and line, New Directions Publishing, →ISBN, page 8:

     A cat like yours is a Schrödinger's cat, sealed up in an office where someone's disintegration provides a 50-50 chance of its death.

2. (by extension) Any hypothetical situation whose circumstances make it impossible to see which among two contrary propositions is correct, especially if the situation is expected to be analysed from the point of view of quantum mechanics.
   • 2004, Colin Bruce, Schrödinger's Rabbits: The Many Worlds of Quantum, page 83:

     To see how, let us consider a nested system of Schrödinger's cats.

Derived terms

• Schrödinger's kitten
• Schrödinger's douchebag

Proper noun

Schrödinger's cat

1. The thought experiment which was devised by Erwin Schrödinger, is usually considered a paradox, involves a Schrödinger's cat and is typically supposed to be analysed from the point of view of quantum mechanics.
2. A Schrödinger's cat (a hypothetical cat that may or may not be dead) in particular, especially when implied to be the only Schrödinger's cat in the world.
   • 2005, Jürgen Pafel, Quantifier scope in German, illustrated edition, John Benjamins Publishing Company, →ISBN, page 21:

     Schrödinger's cat is necessarily alive or dead.

   • 2009, João Magueijo, A brilliant darkness, Basic Books, →ISBN, page 179:

     And you thought Schrödinger's cat was schizophrenic, unsure about life and death.

   • 2010, Rodrigo Enrico, The Physics of Stargates, Eridanus Press, →ISBN, page 80:

     Let us return to the laboratory, where Bob is about to lift the tarp off of the transparent box containing Schrödinger's cat.

Translations

thought experiment

• Arabic: قِطَّة شْرُودِنْغِر f (qiṭṭa(t) šrūdinḡir)
• Basque: Schrodingeren katu
• Bulgarian: ко́тка на Шрьо́дингер f (kótka na Šrjódinger)
• Catalan: gat de Schrödinger m
• Chinese:

  Mandarin: 薛定諤的貓 / 薛定谔的猫 (zh) (Xuēdìng'è de māo)

• Czech: Schrödingerova kočka f
• Danish: Schrödingers kat c
• Dutch: Schrödingers kat
• Esperanto: Kato de Schrödinger
• Finnish: Schrödingerin kissa
• French: chat de Schrödinger (fr) m
• Galician: gato de Schrödinger m
• Georgian: შრედინგერის კატა (šredingeris ḳaṭa)
• German: Schrödingers Katze (de) f
• Hebrew: החתול של שרדינגר m (he'ħatul šel šredinger)
• Hungarian: Schrödinger macskája (hu)
• Italian: paradosso del gatto di Schrödinger m
• Japanese: シュレーディンガーの猫 (shurēdingā no neko)
• Korean: 슈뢰딩거의 고양이 (Syuroedinggeoui goyang'i)
• Norwegian: Schrödingers katt
• Persian: گربه شرودینگر
• Polish: kot Schrödingera m
• Portuguese: gato de Schrödinger m
• Romanian: pisica lui Schrödinger f
• Russian: кот Шрёдингера m (kot Šrjódingera)
• Slovene: Schrödingerjeva mačka f
• Spanish: gato de Schrödinger m
• Swedish: Schrödingers katt c
• Tagalog: pusa ni Schrödinger
• Vietnamese: con mèo của Schrödinger

Further reading

• Schrödinger's cat on Wikipedia.Wikipedia