Noiseless photonic non-reciprocity via optically-induced magnetization

Area of Science:

• Quantum optics
• Photonics
• Atomic physics

Background:

• Optical non-reciprocity is vital for photon manipulation and protection.
• Existing magnetic-free methods face challenges with signal isolation and quantum noise.
• The Faraday effect requires strong magnetic fields, limiting applications.

Purpose of the Study:

• To demonstrate a novel magnetic-free non-reciprocity approach.
• To achieve high isolation performance and investigate quantum noise properties.
• To develop a method applicable to integrated photonic devices.

Main Methods:

• Utilizing optically-induced magnetization in an atom ensemble.
• Employing quantum statistics measurements to verify noiseless properties.
• Testing isolation performance over a wide power dynamic range.

Main Results:

• Achieved excellent optical non-reciprocity with high isolation ratios.
• Demonstrated a power dynamic range of 7 orders of magnitude for isolation.
• Verified the noiseless nature of the device through quantum measurements.

Conclusions:

• The optically-induced magnetization method offers a promising route to magnetic-free non-reciprocity.
• This approach overcomes limitations of previous methods regarding isolation and noise.
• The technique is adaptable for various atom-like emitters, enabling future integrated photonic devices.