Fast path and polarisation manipulation of telecom wavelength single photons in lithium niobate waveguide devices

TL;DR

This paper demonstrates fast polarization and path control of 1550 nm single photons in lithium niobate waveguides, enabling integrated quantum photonic functionalities for quantum information processing.

Contribution

It introduces a platform for rapid, reconfigurable manipulation of single photons using electro-optic effects in lithium niobate waveguides, combining source integration and control.

Findings

Successful heralded single photon state engineering

Quantum interference and entanglement demonstrated

Fast feedback control of quantum states achieved

Abstract

We demonstrate fast polarisation and path control of photons at 1550 nm in lithium niobate waveguide devices using the electro-optic effect. We show heralded single photon state engineering, quantum interference, fast state preparation of two entangled photons and feedback control of quantum interference. These results point the way to a single platform that will enable the integration of nonlinear single photon sources and fast reconfigurable circuits for future photonic quantum information science and technology.