Continuous Automatic Polarization Channel Stabilization from Heterodyne Detection of Coexisting Dim Reference Signals

• URL: http://arxiv.org/abs/2411.15135v1
• Date: Fri, 22 Nov 2024 18:58:01 GMT
• Title: Continuous Automatic Polarization Channel Stabilization from Heterodyne Detection of Coexisting Dim Reference Signals
• Authors: Joseph C. Chapman, Muneer Alshowkan, Kazi Reaz, Tian Li, Mariam Kiran,
• Abstract summary: Quantum networking continues to encode information in polarization states due to ease and precision. variable environmental polarization transformations induced by deployed fiber need correction for deployed quantum networking. We present a new method for automatic polarization compensation ( APC) and demonstrate its performance on a metropolitan quantum network.
• Score: 5.602886645159814
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Quantum networking continues to encode information in polarization states due to ease and precision. The variable environmental polarization transformations induced by deployed fiber need correction for deployed quantum networking. Here we present a new method for automatic polarization compensation (APC) and demonstrate its performance on a metropolitan quantum network. Designing an APC involves many design decisions indicated by the diversity of previous solutions in the literature. Our design leverages heterodyne detection of wavelength-multiplexed dim classical references for continuous high-bandwidth polarization measurements used by newly developed multi-axis (non-)linear control algorithm(s) for complete polarization channel stabilization with no downtime. This enables continuous relatively high-bandwidth correction without significant added noise from classical reference signals. We demonstrate the performance of our APC using a variety of classical and quantum characterizations. Finally, we use C-band and L-band APC versions to demonstrate continuous high-fidelity entanglement distribution on a metropolitan quantum network with average relative fidelity of $0.94\pm0.03$ for over 30 hrs

Related papers

• High-brightness fiber-based Sagnac source of entangled photon pairs for multiplexed quantum networks [0.0]
  A fully fibered source of entangled photon pairs based on a nonlinear Sagnac interferometer is reported.<n>Generation stage supports both polarization and energy-time entanglement without modification.<n>Results demonstrate that the proposed Sagnac source is a practical and scalable building block for future plug-and-play quantum communication and quantum networking platforms.
  arXiv  Detail & Related papers  (2026-02-09T16:26:56Z)
• SKANet: A Cognitive Dual-Stream Framework with Adaptive Modality Fusion for Robust Compound GNSS Interference Classification [47.20483076887704]
  Global Navigation Satellite Systems (GNSS) face growing threats from sophisticated jamming interference.<n>We propose a cognitive deep learning framework built upon a dual-stream architecture that integrates Time-Frequency Images (TFIs) and Power Spectral Density (PSD)<n>We show that SKANet achieves an overall accuracy of 96.99%, exhibiting superior robustness for compound jamming classification.
  arXiv  Detail & Related papers  (2026-01-19T07:42:45Z)
• Continual Quantum Architecture Search with Tensor-Train Encoding: Theory and Applications to Signal Processing [68.35481158940401]
  CL-QAS is a continual quantum architecture search framework.<n>It mitigates challenges of costly encoding amplitude and forgetting in variational quantum circuits.<n>It achieves controllable robustness expressivity, sample-efficient generalization, and smooth convergence without barren plateaus.
  arXiv  Detail & Related papers  (2026-01-10T02:36:03Z)
• 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)
• In situ quantum verification of polarization-stabilized optical channels [0.712813885457233]
  We introduce a novel in situ benchmarking approach that augments a classical polarization tracking system.<n>The method uses the reconstructed map both to validate the classical compensation and to expose noise sources it fails to capture.<n>Our results should unlock new opportunities for in situ channel characterization in quantum-classical coexistence networks.
  arXiv  Detail & Related papers  (2025-10-30T00:19:59Z)
• 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)
• Joint Transmit and Pinching Beamforming for Pinching Antenna Systems (PASS): Optimization-Based or Learning-Based? [89.05848771674773]
  A novel antenna system ()-enabled downlink multi-user multiple-input single-output (MISO) framework is proposed. It consists of multiple waveguides, which equip numerous low-cost antennas, named (PAs) The positions of PAs can be reconfigured to both spanning large-scale path and space.
  arXiv  Detail & Related papers  (2025-02-12T18:54:10Z)
• Hybrid encoder for discrete and continuous variable QKD [0.0]
  This study presents a new hybrid encoder based on an iPOGNAC modulator, ensuring compatibility with Discrete Variable (DV) and Continuous Variable (CV) QKD systems.<n>The proposed scheme is the first supporting DV polarization protocols, thus making it an appealing candidate for space nodes of a future quantum network.
  arXiv  Detail & Related papers  (2024-08-30T16:59:17Z)
• Passive photonic CZ gate with two-level emitters in chiral multi-mode waveguide QED [41.94295877935867]
  We design a passive conditional gate between co-propagating photons using an array of only two-level emitters. The key resource is to harness the effective photon-photon interaction induced by the chiral coupling of the emitter array to two waveguide modes. We show how to harness this non-linear phase shift to engineer a conditional, deterministic photonic gate in different qubit encodings.
  arXiv  Detail & Related papers  (2024-07-08T18:00:25Z)
• Procrustean entanglement concentration in quantum-classical networking [0.605746798865181]
  We describe and experimentally implement Procrustean entanglement concentration for polarization-entangled states contaminated with classical light. We demonstrate our technique both on the tabletop and over a deployed quantum local area network, finding a substantial improvement of two-qubit entangled state fidelity.
  arXiv  Detail & Related papers  (2024-01-02T17:53:57Z)
• Enhancing Dispersive Readout of Superconducting Qubits Through Dynamic Control of the Dispersive Shift: Experiment and Theory [47.00474212574662]
  A superconducting qubit is coupled to a large-bandwidth readout resonator. We show a beyond-state-of-the-art two-state-readout error of only 0.25,%$ in 100 ns integration time. The presented results are expected to further boost the performance of new and existing algorithms and protocols.
  arXiv  Detail & Related papers  (2023-07-15T10:30:10Z)
• Towards Fully Passive Time-Bin Quantum Key Distribution over Multi-Mode Channels [37.69303106863453]
  Phase stabilization of distant quantum time-bin interferometers is a major challenge for quantum communication networks. We demonstrate a novel approach using reference frame independent time-bin quantum key distribution. This is achieved without any mode filtering, mode sorting, adaptive optics, active basis selection, or active phase alignment.
  arXiv  Detail & Related papers  (2023-02-10T03:53:21Z)
• Blind Equalization and Channel Estimation in Coherent Optical Communications Using Variational Autoencoders [1.7188280334580193]
  We investigate the potential of adaptive blind equalizers based on variational inference for carrier recovery in optical communications. We generalize the concept of variational autoencoder (VAE) equalizers to higher order modulation formats.
  arXiv  Detail & Related papers  (2022-04-25T16:46:03Z)
• An Optimal Polarization-Entanglement Source: Frequency-Converted SPDC with Degeneracy, Indistinguishability, and Ultra-High Purity Configurable Over a Large Spectral Range [0.0]
  We present a new SPDC method which circumvents the trade-off problem for polarization-entangled states. Our method can in principle generate optimal polarization-entangled states for polarization-entanglement-based quantum-networking protocols.
  arXiv  Detail & Related papers  (2021-07-16T18:23:55Z)
• Fibre polarization state compensation in entanglement-based quantum key distribution [62.997667081978825]
  Quantum Key Distribution (QKD) using polarisation encoding can be hard to implement over deployed telecom fibres. We show a technique for dynamically compensating fibre-induced alteration in a QKD system over deployed fibre.
  arXiv  Detail & Related papers  (2021-07-16T00:53:48Z)
• Towards fully-fledged quantum and classical communication over deployed fiber with up-conversion module [47.187609203210705]
  We propose and demonstrate a new method, based on up-conversion assisted receiver, for co-propagating classical light and QKD signals. Our proposal exhibits higher tolerance for noise in comparison to the standard receiver, thus enabling the distribution of secret keys in the condition of 4 dB-higher classical power.
  arXiv  Detail & Related papers  (2021-06-09T13:52:27Z)
• Transmon platform for quantum computing challenged by chaotic fluctuations [55.41644538483948]
  We investigate the stability of a variant of a many-body localized (MBL) phase for system parameters relevant to current quantum processors. We find that these computing platforms are dangerously close to a phase of uncontrollable chaotic fluctuations.
  arXiv  Detail & Related papers  (2020-12-10T19:00:03Z)
• Efficient and robust certification of genuine multipartite entanglement in noisy quantum error correction circuits [58.720142291102135]
  We introduce a conditional witnessing technique to certify genuine multipartite entanglement (GME) We prove that the detection of entanglement in a linear number of bipartitions by a number of measurements scales linearly, suffices to certify GME. We apply our method to the noisy readout of stabilizer operators of the distance-three topological color code and its flag-based fault-tolerant version.
  arXiv  Detail & Related papers  (2020-10-06T18:00:07Z)

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.