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Enhanced Ground-Satellite Direct Access via Onboard Rydberg Atomic Quantum Receivers

Qihao Peng, Tierui Gong, Zihang Song, Qu Luo, Zihuai Lin, Pei Xiao, Chau Yuen

TL;DR

Ground-satellite direct access for 6G faces severe free-space path loss, SWaP limits, and spectrum congestion. The paper proposes Rydberg Atomic Quantum Receivers (RAQR) as onboard front ends that transduce RF fields to optical signals via Rydberg-EIT, implemented in a hybrid atomic–electronic transceiver capable of both narrowband and wideband operation. System-level simulations show RAQR-enabled links achieve roughly $6.45$ bits/s/Hz higher achievable rate at $d \\approx 1000$ km, extend reliable reception to $\\,2000$ km versus RF-only limits, and yield a two-order-magnitude improvement in sensing CRB. The work outlines scalable network architectures and deployment pathways, and identifies future ISAC integration and space-qualified hardware as key steps toward operational deployment.

Abstract

Ground-satellite links for 6G networks face critical challenges, including severe path loss, tight size-weight-power limits, and congested spectrum, all of which significantly hinder the performance of traditional radio frequency (RF) front ends. This article introduces the Rydberg Atomic Quantum Receiver (RAQR) for onboard satellite systems, a millimeter-scale front end that converts radio fields to optical signals through atomic electromagnetically induced transparency. RAQR's high sensitivity and high frequency selectivity address link budget, payload, and interference challenges while fitting within space constraints. A hybrid atomic-electronic design and supporting signal model demonstrate enhanced data rate, coverage, and sensing accuracy relative to conventional RF receivers. The article concludes with integration strategies, distributed-satellite concepts, and open research problems for bringing RAQR-enabled satellite payloads into service.

Enhanced Ground-Satellite Direct Access via Onboard Rydberg Atomic Quantum Receivers

TL;DR

Ground-satellite direct access for 6G faces severe free-space path loss, SWaP limits, and spectrum congestion. The paper proposes Rydberg Atomic Quantum Receivers (RAQR) as onboard front ends that transduce RF fields to optical signals via Rydberg-EIT, implemented in a hybrid atomic–electronic transceiver capable of both narrowband and wideband operation. System-level simulations show RAQR-enabled links achieve roughly bits/s/Hz higher achievable rate at km, extend reliable reception to km versus RF-only limits, and yield a two-order-magnitude improvement in sensing CRB. The work outlines scalable network architectures and deployment pathways, and identifies future ISAC integration and space-qualified hardware as key steps toward operational deployment.

Abstract

Ground-satellite links for 6G networks face critical challenges, including severe path loss, tight size-weight-power limits, and congested spectrum, all of which significantly hinder the performance of traditional radio frequency (RF) front ends. This article introduces the Rydberg Atomic Quantum Receiver (RAQR) for onboard satellite systems, a millimeter-scale front end that converts radio fields to optical signals through atomic electromagnetically induced transparency. RAQR's high sensitivity and high frequency selectivity address link budget, payload, and interference challenges while fitting within space constraints. A hybrid atomic-electronic design and supporting signal model demonstrate enhanced data rate, coverage, and sensing accuracy relative to conventional RF receivers. The article concludes with integration strategies, distributed-satellite concepts, and open research problems for bringing RAQR-enabled satellite payloads into service.
Paper Structure (20 sections, 5 figures, 1 table)

This paper contains 20 sections, 5 figures, 1 table.

Table of Contents

  1. Introduction
  2. RAQRs for ground-satellite link
  3. Fundamentals of Rydberg Atomic Quantum Receivers
  4. Quantum Sensing Principles
  5. Representative Implementations
  6. Typical Photodetection Schemes
  7. Mathematical Theories
  8. Natural Benefits of RAQRs for Satellite Applications
  9. RAQR-assisted Satellite System Architectures
  10. Hybrid Transceiver Architecture
  11. Scalable RAQR-Based Satellite Networks
  12. Performance Evaluations of Direct Access
  13. Achievable Rate
  14. Coverage Area
  15. Sensing Performance
  16. ...and 5 more sections

Figures (5)

  • Figure 1: Fundamentals of RAQRs
  • Figure 2: Hybrid Architecture of RF and RQA transceiver
  • Figure 3: Hybrid signal processing for RAQR-based satellites.
  • Figure 4: Scalable RAQR-based satellite networks.
  • Figure 5: Performance of RAQR-enabled satellite systems: (a) achievable rate, (b) coverage area, and (c) sensing accuracy.