Coherence via reiterated beam splitting

TL;DR

This paper explores how cascades of beam splitters can generate quantum coherence from both coherent and incoherent states, analyzing different configurations and input sequences.

Contribution

It introduces new configurations of beam splitter cascades and analyzes their ability to increase quantum coherence from various input states.

Findings

Beam splitters can create coherence from incoherent states.

Different cascade configurations have varying coherence-generating capabilities.

The sequence of input states affects the coherence produced.

Abstract

Beam splitters are not-free operations with regard to quantum coherence. As a consequence, they can create coherence from both coherent and incoherent states. We investigate the increase in coherence produced by cascades of beam splitters. To this end, we construct two different configurations and analyze different sequences of input states.