Physics

Nonlinear system

Mathematics

CMOS

Laser

Nonlinear optics

Noise (video)

Optical amplifier

Image (mathematics)

Parametric statistics

Optics

Statistics

Optical communication

Quantum noise

Limit (mathematics)

Mathematical analysis

Artificial intelligence

Amplifier

Quantum limit

Photonics

Nanophotonics

Computer science

Quantum mechanics

Optoelectronics

Quantum optics

Quantum

Optical parametric amplifier

Science Advances

Optical amplifiers are essential in numerous photonic applications. Parametric amplifiers, relying on a nonlinear material to create amplification, are uniquely promising as they can amplify without generating excess noise. Here, we demonstrate amplification based on the third-order nonlinearity in a single chip while, in addition, reporting a noise figure significantly below the conventional quantum limit when operated in phase-sensitive mode. Our results show the potential of nanophotonics for realizing continuous-wave parametric amplification that can enable applications in optical communications, signal processing, and quantum optics across a wide range of frequencies.

Overcoming the quantum limit of optical amplification in monolithic waveguides