shadbolt peter j (2 risultati)

Soft cover. Condizione: Fine. Alberto Peruzzo, Peter J. Shadbolt, Nicolas Brunner, Sandu Popescu, Jeremy L. O'Brien. "A quantum delayed choice experiment" in "Science" 2 November 2012, American Association for the Advancement of Science, vol 338 no. 6107, pp 634-637 in the full weekly issue. Bound with in this same issue: Florian Kaiser et al., "Entangled-Enabled Delayed-Choice Experiment", pp 637-640. Original wrappers. FINE copy. "Quantum systems exhibit particle-like or wave-like behaviour depending on the experimental apparatus they are confronted by. This wave-particle duality is at the heart of quantum mechanics, and is fully captured in Wheeler's* famous delayed choice gedanken experiment. In this variant of the double slit experiment, the observer chooses to test either the particle or wave nature of a photon after it has passed through the slits. Here we report on a quantum delayed choice experiment, based on a quantum controlled beam-splitter, in which both particle and wave behaviours can be investigated simultaneously. The genuinely quantum nature of the photon's behaviour is tested via a Bell inequality, which here replaces the delayed choice of the observer. We observe strong Bell inequality violations, thus showing that no model in which the photon knows in advance what type of experiment it will be confronted by, hence behaving either as a particle or as wave, can account for the experimental data."--Arxiv (via Cornell University) abstract. [++] "This wave-particle duality is at the heart of quantum mechanics. Its paradoxical nature is best captured in the delayed-choice thought experiment, in which a photon is forced to choose a behavior before the observer decides what to measure."--Wikipedia [++] *John Archibald Wheeler, "The 'Past' and the 'Delayed-Choice Double-Slit Experiment'," in A.R. Marlow, editor, Mathematical Foundations of Quantum Theory, Academic Press (1978), pp 9 48. "The common intention of these several types of experiments is to first do something that, according to some hidden-variable models,  would make each photon "decide" whether it were going to behave as a particle or behave as a wave, and then, before the photon had time to reach the detection device, create another change in the system that would make it seem that the photon had "chosen" to behave in the opposite way. "--Wikipedia.

1st Edition. FIRST EDITION IN ORIGINAL WRAPS OF TWO (withbound) PAPERS RELATED TO WHEELER'S DELAYED CHOICE EXPERIMENT, THESE DEMONSTRATING THE "ULTIMATE" DELAYED CHOICE EXPERIMENT IN WHICH THE CHOICE IS DELAYED UNTIL AFTER THE MEASUREMENT IS MADE. These papers appear in the same November 2, 2012 issue of Science and describe "sophisticated demonstrations of the wave-particle duality of single quanta" (Wikipedia). Both also describe Wheeler delayed choice experiments in which the choice about which path the photon takes is made AFTER the measurement is made. The Peruzzo et al., paper "uses Bell inequalities to replace the delayed choice devices, but it achieves the same experimental purpose in an elegant and convincing way" (Wikipedia). The fourth, by Kaiser et al., specifically notes that "wave and particle behavior can coexist simultaneously" (Kaiser, 2012). The result "underlines the fact that a simple vision of light as a classical wave or a particle is inadequate" (ibid). In 1978, Einstein's last collaborator John Wheeler conducted a milestone thought experiment that has come to be known as Wheeler's delayed choice experiment. Wheeler's paper has generated many subsequent quantum experiments, among them the one offered here. In Wheeler's 1978 experiment, "a single photon has two paths it could take in an interferometer. In its wave character, the photon will take both paths simultaneously. In its particle character, the photon needs to decide which of the two paths it will take. Wheeler proved, in accordance with quantum mechanics, that the decision whether the photon will behave as a wave or as a particle can be [made] even after it has already entered the interferometer" (Science News, January 9, 2013). NOTE: We separately a number of other important works on delayed choice quantum experiments: (1) "Experimental Realization of Wheeler's Delayed-Choice Gedanken Experiment" by Alain Aspect, Philippe Grangier, Jean-François Roch, et al. (Science 315 No. 5814 pp. 966-968, February 6, 2007). (2) "Quantum-enhanced Positioning and Clock Sychronization" (Nature, 412, pp. 417-419, July 26, 2001). (3) "Time and the Quantum: Erasing the Past and Impacting the Future" by Aharonov, Yakir; Zubairy, M. Suhail (Science 307 No. 5711, pp. 875-879, February 11, 2005). CONDITION & DETAILS: New York: American Association for the Advancement of Science. 8vo. Complete. Bright and clean inside and out. Fine condition.