Open AccessQuantum frequency conversion of vacuum squeezed light to bright tunable blue squeezed light and higher-order spatial modes
Author(s) -
Hugo Kerdoncuff,
Jesper B. Christensen,
Mikael Lassen
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.436325
Subject(s) - squeezed coherent state , optics , coherence (philosophical gambling strategy) , quantum optics , physics , quantum metrology , spontaneous parametric down conversion , sum frequency generation , nonlinear optics , vacuum state , quantum , optoelectronics , coherent states , quantum information , laser , quantum network , quantum entanglement , quantum mechanics
Quantum frequency conversion, the process of shifting the frequency of an optical quantum state while preserving quantum coherence, can be used to produce non-classical light at otherwise unapproachable wavelengths. We present experimental 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 ± 50 nm for the generation of bright squeezed light at 472 nm ± 4 nm, currently limited by the phase-matching of the used nonlinear crystal. We demonstrate that the SFG process conserves part of the quantum coherence as a 4.2(±0.2) dB 1064 nm vacuum squeezed state is converted to a 1.6(±0.2) dB tunable bright blue squeezed state. We furthermore demonstrate simultaneous frequency- and spatial-mode conversion of the 1064-nm vacuum squeezed state, and measure 1.1(±0.2) dB and 0.4(±0.2) dB of squeezing in 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.