Creation of a Photonic Time-bin Qubit via Parametric Interaction of Photons in a Driven Resonant Medium

TL;DR

This paper proposes a method to generate time-bin-entangled single-photon states using parametric interactions in a driven resonant medium, enabling controllable entanglement for quantum information applications.

Contribution

It introduces a novel technique for creating temporally-delocalized entangled photon modes via parametric interaction in a driven medium, with tunable entanglement.

Findings

Generation of well-separated time-bin entangled states

Control of entanglement through driving field intensity

Discussion of nonclassical features and nonlocality

Abstract

A novel method of preparing a single photon in temporally-delocalized entangled modes is proposed and analyzed. We show that two single-photon pulses propagating in a driven nonabsorbing medium with different group velocities are temporally split under parametric interaction into well-separated pulses. As a consequence, the single-photon "time-bin-entangled" states are generatedwith a programmable entanglement, which is easily controlled by driving field intensity. The experimental study of nonclassical features and nonlocality in generated states by means of balanced homodyne tomography is discussed.