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Abstract:
Multimode squeezed light is increasingly popular in photonic quantum technologies, including sensing, imaging, and computation. Existing methods for its characterization are technically complex, often reducing the level of squeezing and typically addressing only a single mode at a time. Here, for the first time, we employ optical parametric amplification to characterize multiple squeezing eigenmodes simultaneously. We retrieve the shapes and squeezing degrees of all modes at once through direct detection followed by modal decomposition. This method is tolerant to inefficient detection and does not require a local oscillator. For a spectrally and spatially multimode squeezed vacuum, we characterize the eight strongest spatial modes, obtaining squeezing and anti-squeezing values of up to −5.2 ± 0.2 dB and 8.6 ± 0.3 dB, respectively, despite 50% detection loss. This work, being the first exploration of an optical parametric amplifier’s multimode capability for squeezing detection, paves the way for real-time multimode squeezing detection.
