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Single-Pass Generation and Detection of Ultrafast Multimode Squeezed Light

Abstract : We present the generation of multimode continuous-variable entangled states featuring spatio-spectral correlations at a repetition rate of 156 MHz via a single-pass and non-collinear spontaneous parametric down conversion (SPDC) process in a bulk BBO crystal pumped by an optical frequency comb. The states are building blocks of highly entangled states called dual-rail cluster states and are useful for measurement-based quantum computation. It is a protocol for quantum information based on the successive measurement of the modes of a cluster state. We characterize the states generated in our experiment with a mode-selective homodyne detection where we shape the spectrum and spatial profile of a reference beam to unveil the multimode structure of the parametric light. This way, we measured squeezing in several spectral modes and and revealed non-classical correlations between spatio-spectral modes. Because of the configuration of the parametric process, the states generated are highly multimode both spatially and spectrally and they display a low level of squeezing par mode, i.e. just above the resolution of our homodyne detector. As squeezing is an important resource for measurement-based quantum computation, we decided to develop a new SPDC setup based on wavguides of periodically-poled KTP to replace the bulk BBO crystal. Thanks to the increased nonlinearity, light confinement inside the waveguide and the use of quasi-phase matching, the squeezing per mode of the generated states should be increased. In the meantime, we developed a wideband homodyne detector operating with pulsed light in order to perform pulse-by-pulse homodyne measurements.
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Submitted on : Tuesday, November 30, 2021 - 5:25:10 PM
Last modification on : Tuesday, January 4, 2022 - 5:52:30 AM


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  • HAL Id : tel-03457838, version 1


Tiphaine Kouadou. Single-Pass Generation and Detection of Ultrafast Multimode Squeezed Light. Optics [physics.optics]. Sorbonne Université, 2021. English. ⟨NNT : 2021SORUS105⟩. ⟨tel-03457838⟩



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