Multi-parameter two-photon polarimetry at the quantum limit

• URL: http://arxiv.org/abs/2606.27428v1
• Date: Thu, 25 Jun 2026 18:00:05 GMT
• Title: Multi-parameter two-photon polarimetry at the quantum limit
• Abstract summary: Photonic quantum metrology has demonstrated advantages in precision and resource efficiency for a wide range of applications.<n>We present an experimental protocol approaching the fundamental quantum Cramér-Rao precision bound (QCRB) simultaneously in two polarisation parameters.
• Score: 35.37072154335033
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Photonic quantum metrology has demonstrated advantages in precision and resource efficiency for a wide range of applications, with several schemes approaching the fundamental quantum Cramér-Rao precision bound (QCRB). However, the intrinsic incompatibility of quantum measurements represents a hurdle in extending these advantages to the simultaneous estimation of multiple parameters. In this paper, we present an experimental protocol approaching the QCRB simultaneously in two polarisation parameters, across a wide range of the parameter space, with as few as $\sim 200$ photon pairs, offering advantages for polarimetric sensing for dim sources such as in X-ray astronomy or photosensitive samples.

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