Quantum Mirrors and Crossing Symmetry as Heart of Ghost Imaging
D. B. Ion (1), M. L. Ion (2), L. Rusu (1) ((1) Institute for, Physics, Nuclear Engineering, Department of Fundamental Physics, POB MG 6,, Bucharest, (2) Bucharest University, Department for Nuclear Physics, POB MG, 11, Bucharest, Romania)

TL;DR
This paper demonstrates that ghost imaging can be explained through crossing symmetric photon reactions and quantum mirror laws derived from energy-momentum conservation, challenging the entanglement-based explanation.
Contribution
It introduces a novel explanation of ghost imaging based on crossing symmetry and quantum mirror laws, independent of photon entanglement.
Findings
Ghost imaging laws follow from energy-momentum conservation.
Quantum mirror laws explain observed ghost imaging phenomena.
Proposes experiments to test the quantum mirror hypothesis.
Abstract
In this paper it is proved that the key to understanding the ghost imaging mystery are the crossing symmetric photon reactions in the nonlinear media. Hence, the laws of the plane quantum mirror (QM) and that of spherical quantum mirror, observed in the ghost imaging experiments, are obtained as natural consequences of the energy-momentum conservation laws. So, it is shown that the ghost imaging laws depend only on the energy-momentum conservation and not on the photons entanglement. The extension of these results to the ghost imaging with other kind of light is discussed. Some fundamental experiments for a decisive tests of the [SPDC-DFG]-quantum mirror are suggested.
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