# Modified Two-Photon Interference Achieved by the Manipulation of Entanglement

## TL;DR

This theoretical study shows that manipulating entanglement in a modified two-photon interference setup can produce richer interference patterns, including anti-bunching peaks and high-frequency fringes, enhancing the capabilities of HOM interferometers.

## Contribution

The paper introduces a method to extend HOM interferometer functionality by generating superpositions of entangled photons, resulting in more complex interference patterns.

## Key findings

- Coincidence probability exhibits anti-bunching peaks.
- Interference fringes with twice the optical frequency are observed.
- System can be implemented on a LiNbO3 chip using current waveguide technology.

## Abstract

In this theoretical study we demonstrate that entangled states are able to significantly extend the functionality of Hong-Ou-Mandel (HOM) interferometers. By generating a coherent superposition of parametric-down-conversion photons and spatial entanglement in the input channel, the coincidence probability measured at the output changes from a typical HOM-type dip (photon bunching) into much richer patterns including an anti-bunching peak and rapid oscillation fringes with twice the optical frequency. The considered system should be realizable on a single chip using current waveguide technology in the $LiNbO_3$ platform.