2024
DOI: 10.1364/opticaq.501218
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Correlations for subsets of particles in symmetric states: what photons are doing within a beam of light when the rest are ignored

Aaron Z. Goldberg

Abstract: Given a state of light, how do its properties change when only some of the constituent photons are observed and the rest are neglected (traced out)? By developing formulas for mode-agnostic removal of photons from a beam, we show how the expectation value of any operator changes when only q photons are inspected from a beam, ignoring the rest. We use this to re-express expectation values of operators in terms of the state obtained by randomly selecting q photons. Remarkably, this only equals the true expectati… Show more

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