Sparse interferometry for measuring multiphoton collective phase
arXiv:2205.09780 · doi:10.1103/PhysRevResearch.4.023134
Abstract
A multiphoton collective phase is a multiphoton-scattering feature that cannot be reduced to a sequence of two-photon scattering events, and the three-photon "triad phas" is the smallest nontrivial example. Observing a higher-order collective phase is experimentally challenging, and only triad and four-photon tetrad collective phases have been observed. We introduce a scheme to make higher-order multiphoton collective-phase observations feasible by designing a sparse interferometer, which significantly reduces complexity compared with the current best scheme for observing a multiphoton collective phase. Specifically, our scheme reduces the optical depth from logarithmic to constant and reduces the number of beam splitters from to linear scaling with respect to the collective-phase order . As constant depth reduces loss and dispersion to a fixed rate regardless of collective-phase order, a major obstacle to observing large-scale collective phases is removed.
arXiv comment15 pages, 4 figures
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