Quantum complementarity of microcavity polaritons
Salvatore Savasta, Omar Di Stefano, Vincenzo Savona, Wolfgang Langbein
TL;DR
This paper demonstrates that polariton quantum correlations can be probed through quantum complementarity, revealing that interference occurs only when 'which-way' information is unavailable, supported by experimental and theoretical analysis.
Contribution
It provides the first experimental verification of polariton pair correlations related to quantum complementarity using interference measurements.
Findings
Polariton interference depends on shared signal modes.
Existence of polariton pair correlations storing 'which-way' information.
Theoretical analysis confirms experimental observations.
Abstract
We present an experiment that probes polariton quantum correlations by exploiting quantum complementarity. Specifically, we find that polaritons in two distinct idler-modes interfere if and only if they share the same signal-mode so that "which-way" information cannot be gathered. The experimental results prove the existence of polariton pair correlations that store the "which-way" information. This interpretation is confirmed by a theoretical analysis of the measured interference visibility in terms of quantum Langevin equations.
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