Strongly squeezed states at 532 nm based on frequency up-conversion

Area of Science:

• Quantum optics
• Quantum metrology
• Nonlinear optics

Background:

• Nonclassical states of light are crucial for enhancing measurement precision in quantum metrology.
• Strongly squeezed vacuum states are valuable resources but have been difficult to generate at shorter wavelengths.
• Existing methods are limited by the lack of suitable nonlinear materials for shorter wavelengths.

Purpose of the Study:

• To report the generation of strongly squeezed vacuum states at a shorter wavelength (532 nm).
• To demonstrate a novel method for producing these states via frequency up-conversion.
• To illustrate the application of these states in quantum metrology.

Main Methods:

• Frequency up-conversion of 1550 nm telecommunication wavelength light.
• Generation of strongly squeezed vacuum states at 532 nm.
• Utilizing a model Mach-Zehnder interferometer to test the generated states.

Main Results:

• Successfully generated strongly squeezed vacuum states at 532 nm.
• Achieved 5.5 dB noise suppression, indicating a high degree of squeezing.
• Demonstrated the utility of these up-converted states in a quantum metrology setup.

Conclusions:

• Frequency up-conversion is a viable method for generating strongly squeezed vacuum states at shorter wavelengths.
• This work overcomes previous limitations in generating these states at visible wavelengths.
• The generated states hold significant potential for advancing precision measurements in quantum metrology.