Near-video frame rate quantum sensing using Hong-Ou-Mandel interferometry

• URL: http://arxiv.org/abs/2304.13300v2
• Date: Wed, 17 May 2023 19:07:33 GMT
• Title: Near-video frame rate quantum sensing using Hong-Ou-Mandel interferometry
• Authors: Sandeep Singh, Vimlesh Kumar, Varun Sharma, Daniele Faccio, G. K. Samanta
• Abstract summary: Hong-Ou-Mandel interference has emerged as a promising tool for quantum sensing. We show the generation of photon-pairs with flexible spectral-bandwidth using single-frequency, continuous-wave diode laser.
• Score: 3.882519884342634
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Hong-Ou-Mandel (HOM) interference, the bunching of two indistinguishable photons on a balanced beam-splitter, has emerged as a promising tool for quantum sensing. There is a need for wide spectral-bandwidth photon pairs (for high-resolution sensing) with high brightness (for fast sensing). Here we show the generation of photon-pairs with flexible spectral-bandwidth even using single-frequency, continuous-wave diode laser enabling high-precision, real-time sensing. Using 1-mm-long periodically-poled KTP crystal, we produced degenerate, photon-pairs with spectral-bandwidth of 163.42$\pm$1.68 nm resulting in a HOM-dip width of 4.01$\pm$0.04 $\mu$m to measure a displacement of 60 nm, and sufficiently high brightness to enable the measurement of vibrations with amplitude of $205\pm0.75$ nm and frequency of 8 Hz. Fisher-information and maximum likelihood estimation enables optical delay measurements as small as 4.97 nm with precision (Cram\'er-Rao bound) and accuracy of 0.89 and 0.54 nm, respectively, therefore showing HOM sensing capability for real-time, precision-augmented, in-field quantum sensing applications.

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