Efficient and Robust Spatial-to-Fiber Coupling forMultimode Quantum Networks via CascadedAdaptive Feedback Control

• URL: http://arxiv.org/abs/2510.11086v1
• Date: Mon, 13 Oct 2025 07:30:30 GMT
• Title: Efficient and Robust Spatial-to-Fiber Coupling forMultimode Quantum Networks via CascadedAdaptive Feedback Control
• Authors: Ya Li, WanRu Wang, Weizhe Qiao, Qizhou Wu, Changqing Niu, Xiaolong Zou, Youxing Chen, Xin Guo,
• Abstract summary: We develop a cascaded adaptive feedback control system integrated into the quantum entanglement source preparation path.<n>It boosts single-mode fiber (SMF) coupling efficieneyto over 70% within 20 seconds and enters the most efficient andstable transmission state after 75 seconds.
• Score: 10.079540858511077
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Duan-Lukin-Cirac-Zoller (DLCZ)-based multimodequantum networks rely on efficient spatial-to-fiber coupling, yetenvironmental perturbations compromise this performance. Wedevelop a cascaded adaptive feedback control system integratedinto the quantum entanglement source preparation path.Leveraging a power-feedback hillclimbing algorithm, itdynamically regulates piezoelectric-actuated mirrors to achieveautonomous multi-dimensional beam alignment, Experimentsshow it rapidly boosts single-mode fiber (SMF) coupling efficieneyto over 70% within 20 seconds and entering the most efficient andstable transmission state after 75 seconds.Importantly, it enhancesthe stability of the atom-photon interfacecritical for quantumlight-matter interactionsproviding a practical framework forefficient, robust spatial light transmission in scalable quantumnetworks.

Related papers

• Self-stabilized high-dimensional quantum key distribution on a metropolitan free-space link [0.0]
  We demonstrate high-dimensional time-bin-encoded quantum key distribution over a hybrid metropolitan link.<n>We implement both 2- and 4-dimensional protocols, and obtain estimated secure finite-key rates of (95 +- 28) kbit/s for 4D at (25.0 +- 2.0) dB loss.<n>Our results thus establish a practical and versatile platform for hybrid free-space-to-fiber quantum communication.
  arXiv  Detail & Related papers  (2026-02-25T16:51:05Z)
• Intermodal quantum key distribution over an 18 km free-space channel with adaptive optics and room-temperature detectors [0.0]
  Intermodal quantum key distribution at telecom wavelengths provides a hybrid interface between fiber connections and free-space links.<n>We demonstrate a real-time intermodal quantum key distribution field trial over an 18 km free-space link.<n>An adaptive optics system, implementing direct wavefront sensing and high-order aberration correction, enables efficient single-mode fiber coupling.
  arXiv  Detail & Related papers  (2026-02-18T18:21:12Z)
• Integrated polarization-entangled photon source for wavelength-multiplexed quantum networks [49.82426139329382]
  We present a simple yet high-performance on-chip polarization-entangled photon-pair source on thin-film lithium niobate (TFLN)<n>Our device employs dual quasi-phase matching (D-QPM) that sequentially supports type-0 and type-I spontaneous parametric down-conversion in a single nanophotonic waveguide.<n>We realize wavelength-multiplexed entanglement distribution in a four-user quantum network deployed over metropolitan fiber links up to 50 km.
  arXiv  Detail & Related papers  (2025-11-27T18:30:01Z)
• PASS-Enhanced MEC: Joint Optimization of Task Offloading and Uplink PASS Beamforming [67.78883135636657]
  pinching-antenna system (PASS)-enhanced mobile edge computing (MEC) architecture is investigated.<n>PASS establishes short-distance line-of-sight (LoS) links while effectively mitigating the significant path loss and potential signal blockage.<n>We formulate a network latency minimization problem to joint optimize uplink PASS beamforming and task offloading.
  arXiv  Detail & Related papers  (2025-10-27T03:04:46Z)
• Cavity QED based on strongly localized modes: exponentially enhancing single-atom cooperativity [6.107781681150055]
  We exploit the strongly localized effect of modes in cavity quantum electrodynamics.<n>We show the occurrence of ultra-long vacuum Rabi oscillations and the generation of strong photon blockade.<n>This work holds significant potential for applications in establishing longer-distance quantum communication networks.
  arXiv  Detail & Related papers  (2025-09-05T01:40:25Z)
• Continuous variable quantum communication with 40 pairs of entangled sideband [8.448182970777625]
  We present an efficient extraction and stable control scheme of 40 pairs of entangled sideband modes from the squeezed light.<n>The feasibility of large-capacity quantum dense coding based on these entangled sideband modes is proved experimentally.
  arXiv  Detail & Related papers  (2025-07-14T09:43:17Z)
• Function Approximation for Reinforcement Learning Controller for Energy from Spread Waves [69.9104427437916]
  Multi-generator Wave Energy Converters (WEC) must handle multiple simultaneous waves coming from different directions called spread waves. These complex devices need controllers with multiple objectives of energy capture efficiency, reduction of structural stress to limit maintenance, and proactive protection against high waves. In this paper, we explore different function approximations for the policy and critic networks in modeling the sequential nature of the system dynamics.
  arXiv  Detail & Related papers  (2024-04-17T02:04:10Z)
• Shaping Single Photons through Multimode Optical Fibers using Mechanical Perturbations [55.41644538483948]
  We show an all-fiber approach for controlling the shape of single photons and the spatial correlations between entangled photon pairs. We optimize these perturbations to localize the spatial distribution of a single photon or the spatial correlations of photon pairs in a single spot.
  arXiv  Detail & Related papers  (2023-06-04T07:33:39Z)
• Hyper-entanglement between pulse modes and frequency bins [101.18253437732933]
  Hyper-entanglement between two or more photonic degrees of freedom (DOF) can enhance and enable new quantum protocols. We demonstrate the generation of photon pairs hyper-entangled between pulse modes and frequency bins.
  arXiv  Detail & Related papers  (2023-04-24T15:43:08Z)
• Towards Fully Passive Time-Bin Quantum Key Distribution over Moving Free-Space Channels [36.136619420474766]
  Quantum information in photonic time-bin states is typically considered impractical for moving free-space quantum communication.<n>We demonstrate a novel approach using reference frame independent time-bin quantum key distribution.<n>The scheme can be readily applied over various spatially multi-mode and fluctuating channels involving rapidly moving platforms.
  arXiv  Detail & Related papers  (2023-02-10T03:53:21Z)
• Storage and analysis of light-matter entanglement in a fibre-integrated system [48.7576911714538]
  We demonstrate a fiber-integrated quantum memory entangled with a photon at telecommunication wavelength. The storage device is based on a fiber-pigtailed laser written waveguide in a rare-earth doped solid and allows an all-fiber stable adressing of the memory. Our results feature orders of magnitude advances in terms of storage time and efficiency for integrated storage of light-matter entanglement, and constitute a significant step forward towards quantum networks using integrated devices.
  arXiv  Detail & Related papers  (2022-01-10T14:28:04Z)
• Coherent phase transfer for real-world twin-field quantum key distribution [0.0]
  We develop a solution for the simultaneous key streaming and channel length control, and demonstrate it on a 206 km field-deployed fiber with 65 dB loss. Our technique reduces the quantum-bit-error-rate contributed by channel length variations to 1%, representing an effective solution for real-world quantum communications.
  arXiv  Detail & Related papers  (2020-12-30T15:40:07Z)
• Single-mode fiber coupling with a M-SPGD algorithm for long-range quantum communications [4.329318122553747]
  Single-mode fiber coupling is important for improving signal-to-noise ratio of daylight quantum key distribution (QKD) We develop a single-mode receiver with an adaptive optics (AO) system based on a modal version of the parallel descent algorithm. Under strong atmospheric turbulence, the M-SPGD AO system obtains about 3.7 dB in the single-mode fiber coupling efficiency and a significant suppression of fluctuation.
  arXiv  Detail & Related papers  (2020-12-08T12:16:55Z)
• Tunable quantum photonics platform based on fiber-cavity enhanced single photon emission from two-dimensional hBN [52.915502553459724]
  In this work we present a hybrid system consisting of defect centers in few-layer hBN grown by chemical vapor deposition and a fiber-based Fabry-Perot cavity. We achieve very large cavity-assisted signal enhancement up to 50-fold and equally strong linewidth narrowing owing to cavity funneling. Our work marks an important milestone for the deployment of 2D materials coupled to fiber-based cavities in practical quantum technologies.
  arXiv  Detail & Related papers  (2020-06-23T14:20:46Z)

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.