Open AccessTopological protection of highly entangled non-Gaussian two-photon states
Author(s) -
Konrad Tschernig,
Rosario Lo Franco,
Misha Ivanov,
Miguel A. Bandres,
Kurt Busch,
Armando Pérez-Leija
Publication year - 2021
Publication title -
materials for quantum technology
Language(s) - English
Resource type - Journals
ISSN - 2633-4356
DOI - 10.1088/2633-4356/ac11c3
Subject(s) - quantum entanglement , physics , gaussian , photon , topology (electrical circuits) , quantum mechanics , cluster state , quantum state , quantum , mathematics , combinatorics
We study theoretically the evolution of entangled non-Gaussian two-photon states in disordered topological lattices. Specifically, we consider spatially entangled two-photon states, modulated by Laguerre polynomials up to the 3rd order, which feature ring-shaped spatial and spectral correlation patterns. Such states are discrete analogs of photon-subtracted squeezed states, which are ubiquitous in optical quantum information processing or sensing applications. We find that, in general, a higher degree of entanglement coincides with a loss of topological protection against disorder, this is in line with previous results for Gaussian two-photon states. However, we identify a particular regime in the parameter space of the considered non-Gaussian states, where the situation is reversed and an increase of entanglement can be beneficial for the transport of two-photon quantum states through disordered regions.