Time-bin entangled photon pair generation from Si micro-ring resonator

TL;DR

This paper demonstrates the generation of time-bin entangled photon pairs at telecom wavelengths using a silicon micro-ring resonator, achieving high visibility and wavelength tunability with low pump power.

Contribution

It introduces a silicon micro-ring resonator for efficient, tunable time-bin entangled photon pair generation at telecom wavelengths, with high visibility and low pump power.

Findings

Photon pair generation rate of 90-100 Hz at -3.92 dBm pump power

Time-bin entanglement visibility over 92%

Wavelength tunability achieved by temperature control

Abstract

We demonstrate time-bin entanglement generation in telecom wavelength using a 7 {\mu}m radius Si micro-ring resonator pumped by a continuous wave laser. The resonator structure can enhance spontaneous four wave mixing, leading to a photon pair generation rate of about 90-100 Hz with a laser pump power of as low as -3.92 dBm (0.41 mW). We succeed in observing time-bin entanglement with the visibility over 92%. Moreover, wavelength-tunability of the entangled photon pair is demonstrated by changing the operation temperature.