Waveguided sources of consistent, single-temporal-mode squeezed light: The good, the bad, and the ugly

We study theoretically how the brightness of pumps, with fixed profiles, affects temporal mode structure squeezed states generated by parametric waveguided sources. find that modes these can be partially mismatched and thus distinguishable, which is undesirable when using as resources for quantum computing or heralded state generation. By studying common frequency filtering techniques used experimentally, we although one regain indistinguishability, it comes at price potentially greatly reducing purity state. consider three different source configurations: unapodized single pass, apodized double pass. pass configuration produces optimal results almost perfectly indistinguishable over varying degrees brightness.