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In this perspective we discuss recent theoretical and experimental conceptsgiving a route to a better understanding of conventional and unconventionalpairing mechanisms between opposite-spin fermions arising in one-dimensionalmesoscopic systems. With special attention, we focus on the problem ofexperimental detectability of correlations between particles. We argue thatstate-of-the-art experiments with few ultracold fermions may finally break animpasse and give pioneering and unquestionable verification of the existence ofcorrelated pairs with non-zero center-of-mass momentum.

Few-body perspective on fermionic pairing in one spatial dimension