Multimode squeezed light

What is it about?

This paper present the experimental generation of multimode squeezed states of light for quantum information. It uses a nonlinear waveguide pumped with a femtosecond mode-locked laser to produce the quantum states, and the state characterization is performed with a homodyne detection coupled with ultrafast pulse shaping to target specific squeezed modes.

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Why is it important?

Light fields squeezed in different spatial, spectral and temporal shapes are a versatile and promising resource for quantum information protocols such as measurement-based quantum computing (MBQC), quantum-enhanced sensing or secure multiparty communication, among other. The advantage of the continuous-variable (CV)-approach is the deterministic generation of multipartite entangled states exhibiting two crucial features: a) scalability, i.e., the number of entangled parties, and b) reconfigurability, i.e., the capability to reshape the entanglement links at will.