Vacuum squeezed light for atomic memories at the D2 cesium line.

Area of Science:

• Quantum optics
• Atomic physics
• Nonlinear optics

Background:

• Squeezed light is crucial for advancing quantum technologies.
• Cesium D(2) line is a key atomic transition for quantum information processing.
• Optical parametric oscillators are vital for generating non-classical light states.

Purpose of the Study:

• To experimentally generate squeezed light at 852 nm.
• To achieve significant noise reduction for quantum applications.
• To demonstrate the utility of this light with Cesium atomic ensembles.

Main Methods:

• Utilized a doubly resonant optical parametric oscillator (OPO) below threshold.
• Employed a periodically-poled potassium titanyl phosphate (PPKTP) crystal.
• Locked the generated light to the Cesium D(2) atomic transition at 852 nm.

Main Results:

• Achieved squeezed light generation at 852 nm.
• Demonstrated 50% noise reduction down to the 50 kHz frequency range.
• Confirmed the light's direct usability with Cesium atomic ensembles.

Conclusions:

• Successfully generated usable squeezed light for quantum networking.
• The developed method offers a practical approach for quantum-enhanced sensing and communication.
• This work paves the way for improved quantum network protocols.