Multimode amplitude squeezing through cascaded nonlinear optical processes
arxiv(2024)
摘要
Multimode squeezed light is enticing for several applications, from squeezed
frequency combs for spectroscopy to signal multiplexing in optical computing.
To generate squeezing in multiple frequency modes, optical parametric
oscillators have been vital in realizing multimode squeezed vacuum states
through second-order nonlinear processes. However, most work has focused on
generating multimode squeezed vacua and squeezing in mode superpositions
(supermodes). Bright squeezing in multiple discrete frequency modes, if
realized, could unlock novel applications in quantum-enhanced spectroscopy and
optical quantum computing. Here, we show how Q factor engineering of a
multimode nonlinear cavity with cascaded three wave mixing processes creates
strong, spectrally tunable single mode output amplitude noise squeezing over 10
dB below the shot noise limit. In addition, we demonstrate squeezing for
multiple discrete frequency modes above threshold. This bright squeezing arises
from enhancement of the (noiseless) nonlinear rate relative to decay rates in
the system due to the cascaded generation of photons in a single idler "bath"
mode. A natural consequence of the strong nonlinear coupling in our system is
the creation of an effective cavity in the synthetic frequency dimension that
sustains Bloch oscillations in the modal energy distribution. Bloch mode
engineering could provide an opportunity to better control nonlinear energy
flow in the synthetic frequency dimension, with exciting applications in
quantum random walks and topological photonics. Lastly, we show evidence of
long-range correlations in amplitude noise between discrete frequency modes,
pointing towards the potential of long-range entanglement in a synthetic
frequency dimension.
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