Entanglement-verified time distribution in a metropolitan network

• URL: http://arxiv.org/abs/2504.00802v1
• Date: Tue, 01 Apr 2025 13:57:11 GMT
• Title: Entanglement-verified time distribution in a metropolitan network
• Authors: Mohammed K. Alqedra, Samuel Gyger, Katharina D. Zeuner, Thomas Lettner, Mattias Hammar, Gemma Vall Llosera, Val Zwiller,
• Abstract summary: 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The precise synchronization of distant clocks is a fundamental requirement for a wide range of applications. Here, we experimentally demonstrate a novel approach of quantum clock synchronization utilizing entangled and correlated photon pairs generated by a quantum dot at telecom wavelength. By distributing these entangled photons through a metropolitan fiber network in the Stockholm area and measuring the remote correlations, we achieve a synchronization accuracy of tens of picoseconds by leveraging the tight time correlation between the entangled photons. We show that our synchronization scheme is secure against spoofing attacks by performing a remote quantum state tomography to verify the origin of the entangled photons. We measured a distributed maximum entanglement fidelity of $0.817 \pm 0.040$ to the $|\Phi^+\rangle$ Bell state and a concurrence of $0.660 \pm 0.086$. These 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.

Related papers

• Heralded entanglement of on-demand spin-wave solid-state quantum memories for multiplexed quantum network links [0.0]
  We show telecom heralded entanglement between spatially separated quantum memories with fully adjustable recall time and temporal multiplexing of 15 modes.<n>Results establish our architecture as a prime candidate for the implementation of scalable high-rate quantum network links.
  arXiv  Detail & Related papers  (2025-01-07T20:26:06Z)
• Finite Pulse-Time Effects in Long-Baseline Quantum Clock Interferometry [45.73541813564926]
  We study the interplay of the quantum center-of-mass $-$ that can become delocalized $-$ together with the internal clock transitions. We show at the example of a Gaussian laser beam that the proposed quantum-clock interferometers are stable against perturbations from varying optical fields.
  arXiv  Detail & Related papers  (2023-09-25T18:00:03Z)
• 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)
• Simulation of Entanglement Generation between Absorptive Quantum Memories [56.24769206561207]
  We use the open-source Simulator of QUantum Network Communication (SeQUeNCe), developed by our team, to simulate entanglement generation between two atomic frequency comb (AFC) absorptive quantum memories. We realize the representation of photonic quantum states within truncated Fock spaces in SeQUeNCe. We observe varying fidelity with SPDC source mean photon number, and varying entanglement generation rate with both mean photon number and memory mode number.
  arXiv  Detail & Related papers  (2022-12-17T05:51:17Z)
• Quantum time transfer: a practical method for lossy and noisy channels [0.0]
  This article explores the utility of low-performance quantum-photon sources for quantum networking. It provides picosecond-level timing precision even under high loss and high noise channel conditions representative of daytime space-Earth links. This method is relevant for daytime space-Earth quantum networking and/or providing high-precision secure timing in GPS denied environments.
  arXiv  Detail & Related papers  (2022-11-01T20:33:52Z)
• 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)
• Picosecond synchronization system for quantum networks [0.0]
  We demonstrate a 200 MHz clock-rate fiber optic-based quantum network using off-the-shelf components combined with custom-made electronics and telecommunication C-band photons. Our demonstration sheds light on the role of noise in quantum communication and represents a key step in realizing co-existing classical-quantum networks.
  arXiv  Detail & Related papers  (2022-03-07T04:38:28Z)
• Telecom-band Hyperentangled Photon Pairs from a Fiber-based Source [49.06242674127539]
  We experimentally demonstrate the generation of telecom-band biphotons hyperentangled in both the polarization and frequency DoFs. The states produced by our hyperentanglement source can enable protocols such as dense coding and high-dimensional quantum key distribution.
  arXiv  Detail & Related papers  (2021-12-06T21:37:43Z)
• Telecom-heralded entanglement between remote multimode solid-state quantum memories [55.41644538483948]
  Future quantum networks will enable the distribution of entanglement between distant locations and allow applications in quantum communication, quantum sensing and distributed quantum computation. Here we report the demonstration of heralded entanglement between two spatially separated quantum nodes, where the entanglement is stored in multimode solid-state quantum memories. We also show that the generated entanglement is robust against loss in the heralding path, and demonstrate temporally multiplexed operation, with 62 temporal modes.
  arXiv  Detail & Related papers  (2021-01-13T14:31:54Z)
• Near-ideal spontaneous photon sources in silicon quantum photonics [55.41644538483948]
  Integrated photonics is a robust platform for quantum information processing. Sources of single photons that are highly indistinguishable and pure, that are either near-deterministic or heralded with high efficiency, have been elusive. Here, we demonstrate on-chip photon sources that simultaneously meet each of these requirements.
  arXiv  Detail & Related papers  (2020-05-19T16:46:44Z)
• 1GHz clocked distribution of electrically generated entangled photon pairs [0.0]
  We show the first electrically pulsed sub-Poissonian entangled photon source compatible with existing fiber networks operating at 1GHz. The LED is based on InAs/InP quantum dots emitting in the main telecom window, with a multi-photon probability of less than 10% per emission cycle. We use this device to demonstrate GHz clocked distribution of entangled qubits over an installed fiber network between two points 4.6km apart.
  arXiv  Detail & Related papers  (2020-04-30T15:32:13Z)
• Frequency-Domain Quantum Interference with Correlated Photons from an Integrated Microresonator [96.25398432840109]
  We report frequency-domain Hong-Ou-Mandel interference with spectrally distinct photons generated from a chip-based microresonator. Our work establishes four-wave mixing as a tool for selective high-fidelity two-photon operations in the frequency domain.
  arXiv  Detail & Related papers  (2020-03-14T01:48:39Z)

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.