Programmable Bell state generation in an integrated thin film lithium niobate circuit.

ABSTRACT: Entanglement is central to quantum technologies such as cryptography, sensing, and computing. Photon pairs generated via nonlinear optical processes are excellent for preparing entangled states due to their long coherence times and compatibility with fiber optic networks. Steady progress in nanofabrication has positioned lithium niobate-on-insulator (LNOI) as a leading platform for monolithic integration of photon pair sources into optical circuits, leveraging its strong second-order nonlinearity. Here, we present a reconfigurable photonic integrated circuit on LNOI, which combines two on-chip photon pair sources with programmable interferometers, enabling the generation of entangled states. The photon pair sources achieve a source brightness of 26 MHz nm^-1mW^-1 while

SUBMITTER: Maeder A 

PROVIDER: S-EPMC12764773 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature