What is Erased in the Quantum Erasure?
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In this paper, we re-examine a series of gedanken welcher Weg (WW) experiments introduced by Scully, Englert and Walther that contain the essential ideas underlying the quantum eraser. For this purpose we use the Bohm model which gives a sharp picture of the behaviour of the atoms involved in these experiments. This model supports the thesis that interference disappears in such WW experiments, even though the centre of mass wave function remains coherent throughout the experiment. It also shows exactly what it means to say ‘that the interference can be restored by manipulating the WW detectors long after the atoms have passed’. It does not support Wheeler’s notion that ‘the past is undefined and undefinable without the observation (in the present)’.
KeywordsQuantum erasure welcher Weg experiments Bohm trajectories
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- 3.B. J. Hiley, “Welcher Weg experiments from the Bohm perspective,” in Quantum Theory: Reconsiderations of Foundations-3, G. Adenier, A. Yu. Krennikov, and T. M. Nieuwenhuizen, eds. (AIP, New york, 2006), pp. 154–160.Google Scholar
- 5.Bohm D., Hiley B.J. (1993). The Undivided Universe: An Ontological Interpretation of Quantum Theory. Routledge, LondonGoogle Scholar
- 6.Y. Aharonov and L. Vaidman, “About Position Measurements which do not show the Bohmian Particle Position”, in Bohmian Mechanics and Quantum Theory: an Appraisal, J. T. Cushing, A Fine, and S. Goldstein, eds. Boston Studies in the Philosophy of Science, 184, 141–154 (Kluwer Academic, Dordrecht, 1996).Google Scholar
- 7.Englert J., Scully M.O., Süssman G., Walther H. (1992). “Surrealistic Bohm trajectories”. Z. Naturforsch. 47a, 1175–1186Google Scholar
- 11.J. A. Wheeler, “The “Past”and the “Delayed-Choice” double-slit experiment”, in Mathematical Foundations of Quantum Theory, A. R. Marlow, ed. (Academic, 1978), pp. 9–48.Google Scholar
- 13.N. Erez and M. O. Scully, “Reply to Hiley and Callaghan on the reality/surrealism of the Bohm trajectories”, in Quantum Theory: Reconsideration of Foundations-3, A. Yu. Khrennikov, and Th. M. Nieuwenhuizen, eds. (AIP, New york, 2006), pp. 259–62.Google Scholar
- 14.N. Bohr, Atomic Physics and Human Knowledge (Science Editions, New York, 1961).Google Scholar