SGER: Compact waveguide based source of quadrature squeezing and entanglement

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0533472SaffmanThis SGER research project will demonstrate a compact source of squeezed and entangled light forapplications in quantum communication and measurement. Applications of non-classical light have takenon increased importance in recent years due to the emergence of quantum information and communicationas major areas of research and development. The research proposed here will result in compact sources ofcontinuous variable squeezing and entanglement based on second harmonic generation in a KNbO3 waveguide embedded in an optimized self-imaging ring resonator. There are several novel features of this project that distinguish it from other existing research. All prior demonstrations of entangled sources have used parametric downconversion. Spatial squeezing and entanglement in second harmonic generation have been predicted in intracavity and single pass geometries, but never observed. The use of harmonic generation greatly widens the scope of applications since it will make quantum sources available at new wavelengths.The intellectual merit of the proposed activity is the study and demonstration of spatial nonclassicallight and entanglement in X(2) nonlinear interactions. The PI will investigate a new mechanism of squeezing and entanglement generation that is the result of a spatial modulational instability. Extension of quantum optical effects to the spatial domain is of fundamental interest in the study of non-classical fields and may enable new applications in quantum information transmission, and precision measurements.The broader impact of the proposed activity will be in the furthering of the PI's ability to manipulate andcontrol optical fields. Success in this endeavor may result in new compact sources of nonclassical light forapplications in quantum communication and quantum limited measurements. The research to be performedat The University of Wisconsin - Madison will expose undergraduate and graduate students to state of theart techniques and tools, and train them to contribute to the technological and scientific development ofsociety.