We show that it is possible to associate a de Broglie wavelength with a composite system even when the constituent particles are separated spatially. The nonlocal de Broglie wavelength (λ/2) of a two-photon system separated spatially is measured with an appropriate detection system. The two-photon system is prepared in an entangled state in space-momentum variables. We propose that the same result can be obtained for a system of massive particles separated spatially in an entangled state in space-momentum variables.
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Fonseca et al. (2001) studied this question.
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