Generation of massively entangled bright states of light during harmonic generation in resonant media
arxiv(2024)
摘要
At the fundamental level, full description of light-matter interaction
requires quantum treatment of both matter and light. However, for standard
light sources generating intense laser pulses carrying quadrillions of photons
in a coherent state, classical description of light during intense laser-matter
interaction has been expected to be adequate. Here we show how nonlinear
optical response of matter can be controlled to generate dramatic deviations
from this standard picture, including generation of multiple harmonics of the
incident laser light entangled across many octaves. In particular, non-trivial
quantum states of harmonics are generated as soon as one of the harmonics
induces a transition between different laser-dressed states of the material
system. Such transitions generate an entangled light-matter wavefunction, which
emerges as the key condition for generating quantum states of harmonics,
sufficient even in the absence of a quantum driving field or material
correlations. In turn, entanglement of the material system with a single
harmonic generates and controls entanglement between different harmonics.
Hence, nonlinear media that are near-resonant with at least one of the
harmonics appear to be most attractive for controlled generation of massively
entangled quantum states of light. Our analysis opens remarkable opportunities
at the interface of attosecond physics and quantum optics, with implications
for quantum information science.
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