Demonstration of Lossy Linear Transformations and Two-Photon Interference on a Photonic Chip

TL;DR

This paper demonstrates how engineered loss in a photonic chip can control quantum correlations between entangled photons, enabling the inversion of spatial statistics and providing insights for quantum photonic device design.

Contribution

It introduces a method to control quantum correlations via lossy linear transformations on a photonic chip, using singular value decomposition for design.

Findings

Engineered loss can invert photon spatial correlations from bunching to antibunching.

Photon coincidences within lossy channels offer insights into quantum photonic chip design.

Controlled loss enables manipulation of quantum states on integrated photonic platforms.

Abstract

Studying quantum correlations in the presence of loss is of critical importance for the physical modeling of real quantum systems. Here, we demonstrate the control of spatial correlations between entangled photons in a photonic chip, designed and modeled using the singular value decomposition approach. We show that engineered loss, using an auxiliary waveguide, allows one to invert the spatial statistics from bunching to antibunching. Furthermore, we study the photon statistics within the loss-emulating channel and observe photon coincidences, which may provide insights into the design of quantum photonic integrated chips.