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In this work we strictly and accurately (within standard quantum mechanicalformalism) consider basic part of any single photon interference experiment.Namely we consider quantum dynamical interaction between single photon andphotographic plate (for photon described by superposition or by statisticalmixture of two quantum trajectories or when single photon is entangled withsome other quantum system (photon trajectories detector)). Moreover we considerbasic problem of the quantum mechanics foundation, problem of the transition(collapse) from quantum superposition or entanglement in statistical mixture ofquantum states. Also we use model of the collapse according to which collapserepresents a quantum-classical continuous phase transition with spontaneous(non-dynamical) unitary symmetry (superposition) breaking (effective hiding).(Practically, collapse can be considered as an especial case of the generalformalism of spontaneous symmetry breaking that can be successfully applied inmany different domains of the physics.) All this (that can be simplygeneralized for arbitrary quantum system) is in full agreement with existingexperimental facts. More over it admits existence of the entanglement betweenphoton (quantum system) and detector (Schrodinger cat effect) which clearlydemonstrates that detection procedure (collapse) has no any absolute character.It admits a simple solution of the quantum mechanics foundation problem.

Quantum-classical phase transition with spontaneous superposition breaking and single photon detection