Wavelength division multiplexed and double-port pumped time-bin entangled photon pair generation using Si ring...

Area of Science:

• Quantum optics
• Integrated photonics

Background:

• Time-bin entanglement is crucial for quantum communication.
• Silicon ring resonators offer compact and efficient platforms for photon generation.

Purpose of the Study:

• To develop a wavelength division multiplexed time-bin entangled photon pair source using a silicon ring resonator.
• To investigate the effect of double-port pumping on photon pair generation efficiency.

Main Methods:

• Utilized a 10 μm radius silicon ring resonator with two add and two drop ports.
• Employed continuous laser pumping at one add port for single-port pumping.
• Implemented counter-propagating pump lights injected into two add ports for double-port pumping.
• Used a wavelength filter to split signal and idler photons.

Main Results:

• Achieved efficient generation of two wavelength division multiplexed time-bin entangled photon pairs in the telecom C-band.
• Demonstrated simultaneous entanglement generation from both drop ports using double-port pumping.
• Observed a twofold increase in photon pair count rate at each drop port with double-port pumping compared to single-port pumping.

Conclusions:

• The silicon ring resonator is an efficient platform for generating WDM time-bin entangled photon pairs.
• Double-port pumping significantly enhances photon pair generation efficiency.
• The developed source has potential for various quantum information applications.