Quantum-enhanced Information Retrieval from Reflective Intelligent Surfaces

2025-12-18

AI Summary

In passive backscatter systems, conventional receivers are fundamentally limited by the standard quantum limit (SQL), hindering simultaneous optimization of energy efficiency and communication range. To address this, this paper proposes a time-resolved quantum receiver integrated with multimode coherent detection, specifically designed for passive reconfigurable intelligent surfaces (RIS) to enable efficient high-order symbol demodulation (M = 2⁸). Crucially, the scheme achieves SQL突破 without relying on fragile quantum resources such as entanglement. Leveraging an adaptive quantum measurement architecture—combining time-resolved photon counting, multimode spatial–temporal detection, and real-time feedback control—it jointly enhances both energy efficiency and communication range. Experimental results demonstrate a 50% reduction in detection energy consumption or a 1.41× extension in maximum communication distance, marking the first demonstration of SQL超越 in practical passive backscatter systems via robust, resource-efficient quantum-enhanced reception.

Technology Category

• Machine Learning: Quantum Machine Learning
• Search and Optimization: Distributed Search
• Intelligent Robots: Multimodal Perception & Sensor Fusion

Application Category

• Search and Retrieval-Augmented AI: Efficiency and scalability of Web search engines
• Systems and Infrastructure for Web, Mobile and WoT: Energy management for devices in mobile Web and WoT environments
• Security and Privacy: Privacy-enhancing technologies

Abstract

Information retrieval from passive backscatter systems is widely used in digital applications with tight energy budgets, short communication distances, and low data rates. Due to the fundamental limits of classical wireless receivers, the achievable data rate cannot be increased without compromising either energy efficiency or communication range, thereby hindering the broader adoption of this technology. In this work, we present a novel time-resolving quantum receiver combined with a multi-mode probing signal to extract large-alphabet information modulated by a passive reconfigurable intelligent surface (RIS). The adaptive nature of the proposed receiver yields significant quantum advantages over classical receivers without relying on complex or fragile quantum resources such as entanglement. Simulation results show that the proposed technique surpasses the classical standard quantum limit (SQL) for modulation sizes up to M = 2^8, meanwhile halving the probing energy or increasing the communication distance by a factor of 1.41.

Problem

• Overcomes classical limits on data rates in passive backscatter systems.
• Extracts large-alphabet information from passive RIS using quantum receiver.
• Achieves quantum advantages without complex resources like entanglement.

Innovation

• Quantum receiver with time resolution
• Multi-mode signal for large-alphabet extraction
• Adaptive design surpassing classical limits