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In quantum mechanics, quantum suicide is a thought experiment, originally published independently by Hans Moravec in 1987〔 (If MWI is true, apocalyptic particle accelerators won't function as advertised).〕 and Bruno Marchal in 1988, and independently developed further by Max Tegmark in 1998.〔Tegmark, Max (The Interpretation of Quantum Mechanics: Many Worlds or Many Words? ), 1998〕 It attempts to distinguish between the Copenhagen interpretation of quantum mechanics and the Everett many-worlds interpretation by means of a variation of the Schrödinger's cat thought experiment, from the cat's point of view. Quantum immortality refers to the subjective experience of surviving quantum suicide regardless of the odds.〔 Keith Lynch recalls that Hugh Everett took great delight in paradoxes such as the unexpected hanging. Everett did not mention quantum suicide or quantum immortality in writing, but his work was intended as a solution to the paradoxes of quantum mechanics. Lynch said "Everett firmly believed that his many-worlds theory guaranteed him immortality: his consciousness, he argued, is bound at each branching to follow whatever path does not lead to death";〔See Eugene Shikhovtsev's Biography of Everett: (Keith Lynch remembers 1979–1980 )〕 Tegmark explains, however, that life and death situations do not normally hinge upon a sequence of binary quantum events like those in the thought experiment.〔 ==Thought experiment== Unlike the Schrödinger's cat thought experiment which used hydrocyanic acid and a radioactive decay trigger, this version involves a life-terminating device and a device that measures the spin value of protons. Every 10 seconds, the spin value of a fresh proton is measured. Conditioned upon that quantum bit, the weapon is either deployed, killing the experimenter, or it makes an audible "click" and the experimenter survives. The theories are distinctive from the point of view of the experimenter only; their predictions are otherwise identical. The probability of surviving the first iteration of the experiment is 50%, under both interpretations, as given by the squared norm of the wave function. At the start of the second iteration, if the Copenhagen interpretation is true, the wave function has already collapsed, so if the experimenter is already dead, there's a 0% chance of survival. However, if the many-worlds interpretation is true, a superposition of the live experimenter ''necessarily'' exists, regardless of how many iterations or how improbable the outcome. Barring life after death, it is not possible for the experimenter to experience having been killed, thus the only possible experience is one of having survived every iteration. Although such an experience remains possible in the Copenhagen interpretation, it gets less and less likely to happen as the number of iterations gets bigger, whereas it always is certain in the many-worlds interpretation, no matter the number of iterations. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quantum suicide and immortality」の詳細全文を読む スポンサード リンク
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