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Non-classical states of light, such as number-squeezed light, withfluctuations below the classical shot noise level, have important uses inmetrology, communication, quantum information processing, and quantumsimulation. However, generating these non-classical states of light, especiallywith high intensity and high degree of squeezing, is challenging. To addressthis problem, we introduce a new concept which uses gain to generate intensesub-Poissonian light at optical frequencies. It exploits a strongly nonlineargain for photons which arises from a combination of frequency-dependent gainand Kerr nonlinearity. In this laser architecture, the interaction between thegain medium and Kerr nonlinearity suppresses the spontaneous emission at highphoton number states, leading to a strong "negative feedback" that suppressesphoton-number fluctuations. We discuss realistic implementations of thisconcept based on the use of solid-state gain media in laser cavities with Kerrnonlinear materials, showing how 90% squeezing of photon number fluctuationsbelow the shot noise level can be realized.

Intense squeezed light from lasers with sharply nonlinear gain at optical frequencies