Clock Synchronization with Weakly Correlated Photons

• URL: http://arxiv.org/abs/2602.18147v1
• Date: Fri, 20 Feb 2026 11:24:19 GMT
• Title: Clock Synchronization with Weakly Correlated Photons
• Authors: Justin Yu Xiang Peh, Darren Ming Zhi Koh, Zifang Xu, Xi Jie Yeo, Peng Kian Tan, Christian Kurtsiefer,
• Abstract summary: We demonstrate successful synchronization of crystal clocks using weakly time-correlated photons of 180 ns coherence time from a bunched light source.<n>A synchronization timing jitter of 10 ns is achieved over symmetric -102 dB optical channel loss between two parties, over a span of 25 hours.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Clock synchronization is necessary for communication and distributed computing tasks. Previous schemes based on photon timing correlations use pulsed light or photon pairs for their strong timing correlations. In this work, we demonstrate successful synchronization of crystal clocks using weakly time-correlated photons of 180 ns coherence time from a bunched light source. A synchronization timing jitter of 10 ns is achieved over symmetric -102 dB optical channel loss between two parties, over a span of 25 hours. We also present a model that gives better estimates to the coherence peak finding success probabilities under low signal.

Related papers

• Asynchronous Multi-photon Interference for Quantum Networks [0.0]
  Advanced quantum communication protocols require high-visibility quantum interference between photons generated at distant nodes.<n>An alternative approach employs continuous-wave (CW) photon-pair sources, where temporal indistinguishability is enforced by post-selecting detection events.<n>We develop a theoretical framework that quantitatively describes time-resolved multi-photon interference in the CW regime.
  arXiv  Detail & Related papers  (2026-02-24T16:07:38Z)
• Picosecond Wireless Synchronization with Entangled Photons via Grid-Based Quantum Coverage in Indoor Optical Systems [12.035454349591085]
  We propose a novel entanglement-assisted synchronization framework for indoor optical wireless systems based on grid-based beam steering.<n>A two-stage synchronization algorithm is developed to address the inherent sparsity and randomness of photon detection.<n>Results show that finer grid configurations and optimal photon-pair rates significantly reduce synchronization error.
  arXiv  Detail & Related papers  (2025-10-23T17:49:46Z)
• Enhancing optical lattice clock coherence times with erasure conversion [34.198838606333545]
  We experimentally demonstrate a hyperfine-resolved readout technique for $87$Sr optical lattice clocks.<n>By employing hyperfine-resolved readout in synchronous differential comparisons, we achieve enhanced atomic coherence times exceeding 100 s and 150 s.
  arXiv  Detail & Related papers  (2025-05-09T21:13:05Z)
• Entanglement-verified time distribution in a metropolitan network [0.0]
  We experimentally demonstrate a novel approach of quantum clock synchronization utilizing entangled and correlated photon pairs generated by a quantum dot at telecom wavelength.<n>We achieve a synchronization accuracy of tens of picoseconds by leveraging the tight time correlation between the entangled photons.<n>Results highlight the potential of quantum dot-generated entangled pairs as a shared resource for secure time synchronization and quantum key distribution in real-world quantum networks.
  arXiv  Detail & Related papers  (2025-04-01T13:57:11Z)
• Synchformer: Efficient Synchronization from Sparse Cues [100.89656994681934]
  Our contributions include a novel audio-visual synchronization model, and training that decouples extraction from synchronization modelling. This approach achieves state-of-the-art performance in both dense and sparse settings. We also extend synchronization model training to AudioSet a million-scale 'in-the-wild' dataset, investigate evidence attribution techniques for interpretability, and explore a new capability for synchronization models: audio-visual synchronizability.
  arXiv  Detail & Related papers  (2024-01-29T18:59:55Z)
• Clock synchronization with pulsed single photon sources [0.0]
  Photonic quantum technology requires precise, time-resolved identification of photodetection events. Here we build on recent advances of using single-photons for time transfer and employ and quantify a fast postprocessing scheme designed to pulsed single-photon sources. We achieve an average root mean square synchronization jitter of 3.0 ps and a stability comparable to systems with ultra-stable clocks.
  arXiv  Detail & Related papers  (2022-12-23T21:10:25Z)
• On-chip quantum information processing with distinguishable photons [55.41644538483948]
  Multi-photon interference is at the heart of photonic quantum technologies. Here, we experimentally demonstrate that detection can be implemented with a temporal resolution sufficient to interfere photons detuned on the scales necessary for cavity-based integrated photon sources. We show how time-resolved detection of non-ideal photons can be used to improve the fidelity of an entangling operation and to mitigate the reduction of computational complexity in boson sampling experiments.
  arXiv  Detail & Related papers  (2022-10-14T18:16:49Z)
• Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power [51.961447341691]
  Nonclassical photon sources of high brightness are key components of quantum communication technologies. We here demonstrate the generation of narrowband, nonclassical photon pairs by employing spontaneous four-wave mixing in an optically-dense ensemble of cold atoms within a hollow-core fiber.
  arXiv  Detail & Related papers  (2022-08-10T09:04:15Z)
• Auto-heterodyne characterization of narrow-band photon pairs [68.8204255655161]
  We describe a technique to measure photon pair joint spectra by detecting the time-correlation beat note when non-degenerate photon pairs interfere at a beamsplitter. The technique is well suited to characterize pairs of photons, each of which can interact with a single atomic species.
  arXiv  Detail & Related papers  (2021-01-08T18:21:30Z)
• Absolute clock synchronization with a single time-correlated photon pair source over 10km [0.0]
  We show a point-to-point clock synchronization protocol based on bidirectionally propagating photons generated in a single spontaneous parametric down-conversion source. Tight timing correlations between photon pairs are used to determine the single and round-trip times measured by two separate clocks.
  arXiv  Detail & Related papers  (2020-09-09T08:52:49Z)
• Synchronisation phase as an indicator of persistent quantum correlations between subsystems [68.8204255655161]
  Spontaneous synchronisation is a collective phenomenon that can occur in both dynamical classical and quantum systems. We show that our analysis applies to a variety of spontaneously synchronising open quantum systems.
  arXiv  Detail & Related papers  (2020-06-29T17:21:32Z)
• Thermal coupling and effect of subharmonic synchronization in a system of two VO2 based oscillators [55.41644538483948]
  We explore a prototype of an oscillatory neural network (ONN) based on vanadium dioxide switching devices. The effective action radius RTC of coupling depends both on the total energy released during switching and on the average power. In the case of a strong thermal coupling, the limit of the supply current parameters, for which the oscillations exist, expands by 10 %. The effect of subharmonic synchronization hold promise for application in classification and pattern recognition.
  arXiv  Detail & Related papers  (2020-01-06T03:26:53Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.