Simultaneous measurement of multimode squeezing

• URL: http://arxiv.org/abs/2402.15786v1
• Date: Sat, 24 Feb 2024 11:01:49 GMT
• Title: Simultaneous measurement of multimode squeezing
• Authors: Ismail Barakat, Mahmoud Kalash, Dennis Scharwald, Polina Sharapova, Norbert Lindlein, Maria Chekhova
• Abstract summary: Multimode squeezed light is an increasingly popular tool in photonic quantum technologies. Here, we demonstrate experimentally how the squeezing can be measured in multiple spatial modes simultaneously. We obtain highest squeezing and anti-squeezing values of $-5.2 pm 0.2$ dB and $8.6 pm 0.3$ dB, respectively.
• Score: 1.2349871196144497
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Multimode squeezed light is an increasingly popular tool in photonic quantum technologies, including sensing, imaging, and computation. Meanwhile, the existing methods of its characterization are technically complicated, and in the best case, deal with a single mode at a time. Here, we demonstrate experimentally how the squeezing can be measured in multiple spatial modes simultaneously, using optical parametric amplification and direct detection followed by modal decomposition based on spatial intensity correlations. We apply this method to a multimode squeezed vacuum generated via high-gain parametric down-conversion. We measure the degrees of squeezing and anti-squeezing for eight strongest spatial modes, obtaining highest squeezing and anti-squeezing values of $-5.2 \pm 0.2$ dB and $8.6 \pm 0.3$ dB, respectively.

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