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Quantum frequency conversion, the process of shifting the frequency of anoptical quantum state while preserving quantum coherence, can be used toproduce non-classical light at otherwise unapproachable wavelengths. We presentexperimental results based on highly efficient sum-frequency generation (SFG)between a vacuum squeezed state at 1064 nm and a tunable pump source at 850 nm$\pm$ 50 nm for the generation of bright squeezed light at 472~nm $\pm$ 4~nm,currently limited by the phase-matching of the used nonlinear crystal. Wedemonstrate that the SFG process conserves part of the quantum coherence as a4.2($\pm0.2$)~dB 1064 nm vacuum squeezed state is converted to a1.6($\pm$0.2)~dB tunable bright blue squeezed state. We furthermore demonstratesimultaneous frequency- and spatial-mode conversion of the 1064-nm vacuumsqueezed state, and measure 1.1($\pm$0.2)~dB and 0.4($\pm$0.2)~dB of squeezingin the TEM$_{01}$ and TEM$_{02}$ modes, respectively. With further development,we foresee that the source may find use within fields such as sensing,metrology, spectroscopy, and imaging.

Quantum frequency conversion of vacuum squeezed light to bright tunable blue squeezed light and higher-order spatial modes