High-Precision Measurement of Time Delay with Frequency-Resolved Hong-Ou-Mandel Interference of Weak Coherent States
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| Main Authors: | , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917140161888256 |
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| author | Di Lena, Francesco Sgobba, Fabrizio Triggiani, Danilo Andrisani, Andrea Lupo, Cosmo Daniele, Piergiorgio Fratta, Gennaro Acconcia, Giulia Rech, Ivan Amato, Luigi Santamaria |
| author_facet | Di Lena, Francesco Sgobba, Fabrizio Triggiani, Danilo Andrisani, Andrea Lupo, Cosmo Daniele, Piergiorgio Fratta, Gennaro Acconcia, Giulia Rech, Ivan Amato, Luigi Santamaria |
| contents | We demonstrate a scheme for high-precision measurements of time delay based on frequency-resolved Hong-Ou-Mandel (HOM) interference. Our approach is applied to weak coherent states and exploits an array of single-photon avalanche diodes (SPADs). Unlike conventional HOM experiments, our setup enables high-precision measurements producing an uncertainty per coincidence of about $\sim 10$ ps even for photons separated by delays up to $\sim 4$ ps so much greater than their coherence time where ordinary non-resolved HOM fails. This result confirms our newly developed theoretical predictions that consider, differently from previous theoretical results, a finite frequency resolution in the detection. We compare the performance of this scheme against the conventional non-resolved case. Experimental data align well with the predictions of quantum estimation theory, demonstrating a significant reduction in the uncertainty. Due to the physics of the frequency-resolved HOM effect, the gain in precision is particularly high when the estimated time delay is much longer than the coherence time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_03098 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-Precision Measurement of Time Delay with Frequency-Resolved Hong-Ou-Mandel Interference of Weak Coherent States Di Lena, Francesco Sgobba, Fabrizio Triggiani, Danilo Andrisani, Andrea Lupo, Cosmo Daniele, Piergiorgio Fratta, Gennaro Acconcia, Giulia Rech, Ivan Amato, Luigi Santamaria Quantum Physics We demonstrate a scheme for high-precision measurements of time delay based on frequency-resolved Hong-Ou-Mandel (HOM) interference. Our approach is applied to weak coherent states and exploits an array of single-photon avalanche diodes (SPADs). Unlike conventional HOM experiments, our setup enables high-precision measurements producing an uncertainty per coincidence of about $\sim 10$ ps even for photons separated by delays up to $\sim 4$ ps so much greater than their coherence time where ordinary non-resolved HOM fails. This result confirms our newly developed theoretical predictions that consider, differently from previous theoretical results, a finite frequency resolution in the detection. We compare the performance of this scheme against the conventional non-resolved case. Experimental data align well with the predictions of quantum estimation theory, demonstrating a significant reduction in the uncertainty. Due to the physics of the frequency-resolved HOM effect, the gain in precision is particularly high when the estimated time delay is much longer than the coherence time. |
| title | High-Precision Measurement of Time Delay with Frequency-Resolved Hong-Ou-Mandel Interference of Weak Coherent States |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.03098 |