Polarization Entanglement by Time-Reversed Hong-Ou-Mandel Interference

Area of Science:

• Quantum optics
• Quantum information science

Background:

• Entanglement sources are crucial for quantum technology.
• Improving generation rate and quality is essential for practical applications.

Purpose of the Study:

• To present an ultrabright source of polarization-entangled photon pairs.
• To overcome limitations of existing entanglement generation methods.

Main Methods:

• Utilizing time-reversed Hong-Ou-Mandel interference.
• Superimposing four pair-creation events on a polarization beam splitter.
• Achieving indistinguishable photons without wavelength or angular constraints.

Main Results:

• High-fidelity polarization entanglement achieved.
• High photon pair-generation rates demonstrated.
• No active interferometric stabilization required.

Conclusions:

• The developed source is an ideal candidate for quantum applications.
• Enables practical applications requiring indistinguishable photons.
• Advances the development of quantum technologies.