Robustness of WDM technique for the co-propagation of quantum with classical signals in an optical fiber

• URL: http://arxiv.org/abs/2411.16942v2
• Date: Fri, 25 Apr 2025 11:35:26 GMT
• Title: Robustness of WDM technique for the co-propagation of quantum with classical signals in an optical fiber
• Authors: Sumit Chaudhary, Shahram Dehdashti, Igor Litvin, Janis Nötzel,
• Abstract summary: We study the evolution of co-propagating quantum and classical signals that are launched using WDM.<n> calculations show that only the first two nearest channels from the classical channel experience noticeable crosstalk.<n>This reflects the WDM technique is in principle robust in the integration of weak quantum links into classical data traffic.
• Score: 1.6999370482438731
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Many quantum communication systems operate based on weak light pulses which by design are assumed to operate in isolation from regular data traffic. With the widespread availability and commercialization of these systems comes a need for seamless integration already at the physical layer. In particular for optical fiber links where wavelength division multiplexing (WDM) is the dominant data transmission technique this results in the propagation of very weak quantum signals against a strong data signal background. With this work, we present a novel theoretical approach that studies the evolution of co-propagating quantum and classical signals that are launched using WDM. The important factors that contribute to crosstalk, such as the launch power of the classical signal and the separation between the two signals in terms of wavelength, are comprehensively analyzed. Interestingly, calculations show that only the first two nearest channels from the classical channel experience noticeable crosstalk whereas other distant channels have negligible crosstalk effect. This reflects the WDM technique is in principle robust in the integration of weak quantum links into classical data traffic.

Related papers

• Secret Key Rate Limits in Coexisting Classical-Quantum Optical Links [0.0]
  We derive expressions for evaluating the accumulated interference power from coexisting classical signals in a quantum frequency channel.<n>Our model enables effective design of classical-quantum systems in single-mode fibers.
  arXiv  Detail & Related papers  (2026-02-25T08:08:52Z)
• Simultaneous Classical and Quantum Communications: Recent Progress and Three Challenges [52.931372025288844]
  We explore novel protocols that enable simultaneous classical and quantum communications.<n>We extend quantum communication capabilities beyond traditional optical bands into the terahertz.<n>We identify open problems that must be addressed to facilitate practical implementation.
  arXiv  Detail & Related papers  (2025-12-11T00:27:08Z)
• 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)
• Accurate and Effective Model for Coexistence of Classical and Quantum Signals In Optical Fibers [5.450971469135477]
  We discuss the main interference mechanisms in coexistence scenarios and provide a model to quantify their impact on the quantum signal quality.<n>The model accounts for out-of-band non-linear interference effects, namely spontaneous Raman scattering (SpRS) and four-wave-mixing (FWM)<n>Our model reveals that FWM has negligible impact in counter-propagating schemes, but can be relevant in co-propagating schemes under certain scenarios.
  arXiv  Detail & Related papers  (2025-10-03T08:22:41Z)
• Anticipating Decoherence: a Predictive Framework for Enhancing Coherence in Quantum Emitters [96.41185946460115]
  We develop an anticipatory framework for forecasting and decoherence engineering in remote quantum emitters.<n>We show that a machine learning model trained on limited data can accurately forecast unseen spectral behavior.<n>These results pave the way for real-time decoherence engineering in scalable quantum systems.
  arXiv  Detail & Related papers  (2025-08-04T17:23:14Z)
• Crosstalk-Resilient Quantum MIMO for Scalable Quantum Communications [40.44880302154388]
  Crosstalk arises when physically coupled quantum modes interfere, degrading signal fidelity.<n>We propose a mitigation strategy based on encoding discrete-variable quantum information into continuous-variable modes.<n>We prove the existence of a gauge-fixing decoder enabling recovery of the logical information.
  arXiv  Detail & Related papers  (2025-06-26T18:40:26Z)
• Crosstalk Analysis in Quantum Networks: Detection and Localization Insights with photon counting OTDR [0.8864713498989825]
  Crosstalk from sub-milliwatt classical-channel power into quantum channels presents a significant challenge in quantum network development. We report a demonstration using photon counting optical time-domain reflectometry (nu-OTDR) to precisely identify and localize crosstalk.
  arXiv  Detail & Related papers  (2025-02-20T15:02:48Z)
• Increasing the secret key rate of satellite-to-ground entanglement-based QKD assisted by adaptive optics [0.48182159227299687]
  Future quantum networks will be composed of both terrestrial links for metropolitan and continent-scale connections and space-based links for global coverage and infrastructure resilience. The propagation of quantum signals through the atmosphere is severely impacted by the effects of turbulence. This is even more the case for entanglement-based quantum communication protocols requiring two free-space channels to be considered simultaneously. We show in particular that this improves the performance of entanglement-based quantum key distribution by up to a few hundred bits per second when compared with the uncorrected scenario.
  arXiv  Detail & Related papers  (2024-11-14T16:16:10Z)
• 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)
• Routing and wavelength assignment in hybrid networks with classical and quantum signals [0.0]
  We propose a simple method for routing and wavelength assignment in wavelength multiplexed networks in which classical and quantum channels coexist. Theses reduce the shared path between classical and quantum channels and improve the signal-to-noise ratio in the quantum channels, improving their quantum key rate.
  arXiv  Detail & Related papers  (2023-11-17T12:04:00Z)
• Synchronization of quantum communication over an optical classical communication channel [0.0]
  We introduce a synchronization technique that exploits a co-propagating classical optical communication link. Our method exploits classical and quantum signals locked to the same master clock, allowing the receiver to synchronize both the classical and quantum communication links. Our approach is suitable for both satellite and fiber infrastructures, where a classical and quantum channel can be transmitted through the same link.
  arXiv  Detail & Related papers  (2023-06-30T12:23:52Z)
• Eavesdropper localization for quantum and classical channels via nonlinear scattering [58.720142291102135]
  Quantum key distribution (QKD) offers theoretical security based on the laws of physics. We present a novel approach to eavesdropper location that can be employed in quantum as well as classical channels. We demonstrate that our approach outperforms conventional OTDR in the task of localizing an evanescent outcoupling of 1% with cm precision inside standard optical fibers.
  arXiv  Detail & Related papers  (2023-06-25T21:06:27Z)
• Joint Channel Estimation and Feedback with Masked Token Transformers in Massive MIMO Systems [74.52117784544758]
  This paper proposes an encoder-decoder based network that unveils the intrinsic frequency-domain correlation within the CSI matrix. The entire encoder-decoder network is utilized for channel compression. Our method outperforms state-of-the-art channel estimation and feedback techniques in joint tasks.
  arXiv  Detail & Related papers  (2023-06-08T06:15:17Z)
• On Neural Architectures for Deep Learning-based Source Separation of Co-Channel OFDM Signals [104.11663769306566]
  We study the single-channel source separation problem involving frequency-division multiplexing (OFDM) signals. We propose critical domain-informed modifications to the network parameterization, based on insights from OFDM structures.
  arXiv  Detail & Related papers  (2023-03-11T16:29:13Z)
• Random Orthogonalization for Federated Learning in Massive MIMO Systems [85.71432283670114]
  We propose a novel communication design for federated learning (FL) in a massive multiple-input and multiple-output (MIMO) wireless system. Key novelty of random orthogonalization comes from the tight coupling of FL and two unique characteristics of massive MIMO -- channel hardening and favorable propagation. We extend this principle to the downlink communication phase and develop a simple but highly effective model broadcast method for FL.
  arXiv  Detail & Related papers  (2022-10-18T14:17:10Z)
• Coexistent quantum channel characterization using spectrally resolved Bayesian quantum process tomography [0.0]
  Coexistence of quantum and classical signals over same optical fiber is critical for operating quantum networks. We systematically characterize the quantum channel that results from simultaneously distributing approximate single-photon polarization-encoded qubits.
  arXiv  Detail & Related papers  (2022-08-30T19:57:45Z)
• Quantum Semantic Communications for Resource-Efficient Quantum Networking [52.3355619190963]
  This letter proposes a novel quantum semantic communications (QSC) framework exploiting advancements in quantum machine learning and quantum semantic representations. The proposed framework achieves approximately 50-75% reduction in quantum communication resources needed, while achieving a higher quantum semantic fidelity.
  arXiv  Detail & Related papers  (2022-05-05T03:49:19Z)
• 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)

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.