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We predict a generic manifestation of quantum interference in many-bodybosonic systems resulting in a coherent enhancement of the average returnprobability in Fock space. This enhancement is both robust with respect tovariations of external parameters and genuinely quantum insofar as it cannot bedescribed within mean-field approaches. As a direct manifestation of thesuperposition principle in Fock space, it arises when many-body equilibrationdue to interactions sets in. Using a semiclassical approach based oninterfering paths in Fock space, we calculate the magnitude of thebackscattering peak and its dependence on gauge fields that break time-reversalinvariance. We confirm our predictions by comparing them to exact quantumevolution probabilities in Bose-Hubbard models, and discuss the relevance ofour findings in the context of many-body thermalization.

Coherent Backscattering in Fock Space: a Signature of Quantum Many-Body Interference in Interacting Bosonic Systems