10-dB squeeze laser tuneable over half a nanometer around 1550 nm

Area of Science:

• Quantum optics
• Quantum information science

Background:

• Optical continuous-variable quantum computers require lasers generating monochromatic light beams with sideband spectra in strongly squeezed vacuum states.
• Previous systems faced limitations in tunability and integration for scalable quantum computing architectures.

Purpose of the Study:

• To develop a novel
• squeeze laser
• capable of producing tunable squeezed vacuum states at 1550 nm for optical quantum computing applications.

Main Methods:

• Utilized parametric down-conversion in a periodically poled KTP crystal within a resonant cavity.
• Achieved double resonance and phase matching by individually optimizing and controlling the temperatures of two crystal sections.
• Integrated a tunable 1550 nm master laser for wavelength control.

Main Results:

• Successfully generated 10 dB squeezed vacuum states at 1550 nm.
• Demonstrated tunability of the output wavelength by 0.5 nm without compromising the squeeze factor.
• Established a foundation for wavelength-division multiplexing by combining multiple identical squeeze lasers.

Conclusions:

• The developed squeeze laser is a key enabling technology for building scalable optical continuous-variable quantum computers.
• The demonstrated tunability and potential for multiplexing offer a significant advancement over previous squeezed light sources.
• Future work will focus on expanding the tunable wavelength range by improving the master laser's tunability.