Even though India’s telecom industry is rapidly transitioning to 5G, users continue to encounter uneven speeds, latency spikes, and dropped calls. Concerns regarding data security are also growing at the same time. This chapter explores the ways in which quantum interventions, such as quantum key distribution (QKD), post-quantum cryptography (PQC), and quantum/quantum-inspired network optimization, can improve perceived service quality as well as objective quality of service (QoS). We only use secondary data, such as user-experience metrics from Opensignal (June 2025) and city-level QoS from TRAI Independent Drive Tests (May 2025). We also define an operator-level Quantum Readiness Index based on public pilots and existing standards. We present the QASQ—Quantum-Assured Service Quality model, which builds upon SERVQUAL and UTAUT-3. According to the model, perceived assurance and responsiveness → trust, satisfaction, and loyalty → quantum readiness → QoS outcomes (call drops, latency/jitter, throughput stability, CSSR). Descriptive comparisons, basic correlations, and fixed-effects regressions at the operator × city level, with an optional composite path view for reporting, comprise our transparent and reproducible analysis plan. The data shows where quantum levers can provide the biggest service gains and where performance dispersion is highest. The chapter offers a framework tailored to India, a clean measurement recipe utilizing publicly available datasets, and a workable pilot roadmap (including metro QKD routes, quantum-inspired optimization on known pain corridors, and crypto-inventory and PQC migration). The objective is simple: increase security and dependability in ways that consumers can relate to and trust.
Even though India’s telecom industry is rapidly transitioning to 5G, users continue to encounter uneven speeds, latency spikes, and dropped calls. Concerns regarding data security are also growing at the same time. This chapter explores the ways in which quantum interventions, such as quantum key distribution (QKD), post-quantum cryptography (PQC), and quantum/quantum-inspired network optimization, can improve perceived service quality as well as objective quality of service (QoS). We only use secondary data, such as user-experience metrics from Opensignal (June 2025) and city-level QoS from TRAI Independent Drive Tests (May 2025). We also define an operator-level Quantum Readiness Index based on public pilots and existing standards. We present the QASQ—Quantum-Assured Service Quality model, which builds upon SERVQUAL and UTAUT-3. According to the model, perceived assurance and responsiveness → trust, satisfaction, and loyalty → quantum readiness → QoS outcomes (call drops, latency/jitter, throughput stability, CSSR). Descriptive comparisons, basic correlations, and fixed-effects regressions at the operator × city level, with an optional composite path view for reporting, comprise our transparent and reproducible analysis plan. The data shows where quantum levers can provide the biggest service gains and where performance dispersion is highest. The chapter offers a framework tailored to India, a clean measurement recipe utilizing publicly available datasets, and a workable pilot roadmap (including metro QKD routes, quantum-inspired optimization on known pain corridors, and crypto-inventory and PQC migration). The objective is simple: increase security and dependability in ways that consumers can relate to and trust.
Abstract: This study advances a unifying systems perspective on quantum-safe network security by synthesizing recent progress in quantum cryptography with practical integration patterns across carrier-grade infrastructures. Concept analysis distinguishes the roles of quantum key distribution (QKD), device-independent variants, quantum authentication, and post-quantum cryptography (PQC) within zero-trust architectures. Building on this, a layered framework—spanning physical/entanglement resources, key management, crypto-agility, control plane orchestration, and policy/compliance—is articulated to support end-to-end, composable guarantees. The problem addressed is the realization of verifiable, quantum-resilient security under operational constraints involving latency, key-rate variability, and heterogeneous trust assumptions. Methodology combines a structured literature synthesis with formal composability mapping to universal composability principles, adversarial threat modeling for quantum-enabled attackers, and testbed/simulation evaluation of hybrid QKD–PQC pipelines across L2–L3 segments and 5G/6G backhaul scenarios. Key results indicate that (i) selective QKD deployment on high-value links coupled with PQC at endpoints enhances resilience while preserving crypto-agility; (ii) automated key-lifecycle orchestration reduces exposure windows; and (iii) device-independent assurances strengthen guarantees where trust relaxation is necessary. The impact is a deployment-ready reference architecture, measurable integration metrics, and guidance aligned with emerging standards for critical infrastructure and national networks. The implications extend to procurement, compliance, and roadmap planning for quantum-era network security. Keywords: quantum-safe cryptography, quantum key distribution (QKD), post-quantum cryptography (PQC), hybrid QKD–PQC, composable security, device-independent QKD, zero-trust networks, key management and orchestration, 5G/6G backhaul, network security architecture, standards and interoperability
India's digital governance infrastructure, spanning Aadhaar, UPI, DigiLocker, and critical sectors such as defence, finance, and telecommunications, is built upon classical publickey cryptography (RSA, ECC). The emergence of fault-tolerant quantum computers threatens to dismantle these foundations through Shor's algorithm, which solves integer factorisation and discrete logarithm problems in polynomial time, while Grover's algorithm reduces symmetric key security. The "harvest now, decrypt later" strategy magnifies the urgency, as adversaries can store encrypted data today for future decryption. This paper provides a comprehensive analysis of the post-quantum cryptography (PQC) migration imperative for India. We examine the quantum threat landscape, review candidate PQC families (lattice-, code-, multivariate-, hash-, and isogeny-based) and the newly standardised NIST algorithms, and detail the technical, regulatory, and economic challenges of large-scale PQC adoption in India's heterogeneous e-governance ecosystem. A phased implementation roadmap aligned with the National Quantum Mission (2026 to 2035) is presented, prioritising critical sectors (defence, banking, telecom, Aadhaar/UPI). The paper further highlights strategic opportunities for indigenous capability building, global certification leadership, and the reinforcement of digital sovereignty. By synthesising official reports, international standards, and sector-specific requirements, this work offers actionable guidance for transitioning India's governance to a quantum-resilient future. The paper further proposes the Quantum Governance Readiness and Infrastructure Decision Framework (Q-GRID), an India-specific, measurable decision framework that integrates quantum exposure, data longevity, systemic criticality, dependency, migration complexity, and regulatory urgency into a composite Quantum Risk Index to prioritise migration actions.
In recent years, noticeable progress has been made in the development of quantum equipment, reflected through the number of successful demonstrations of Quantum Key Distribution (QKD) technology. Although they showcase the great achievements of QKD, many practical difficulties still need to be resolved. Inspired by the significant similarity between mobile ad-hoc networks and QKD technology, we propose a novel quality of service (QoS) model including new metrics for determining the states of public and quantum channels as well as a comprehensive metric of the QKD link. We also propose a novel routing protocol to achieve high-level scalability and minimize consumption of cryptographic keys. Given the limited mobility of nodes in QKD networks, our routing protocol uses the geographical distance and calculated link states to determine the optimal route. It also benefits from a caching mechanism and detection of returning loops to provide effective forwarding while minimizing key consumption and achieving the desired utilization of network links. Simulation results are presented to demonstrate the validity and accuracy of the proposed solutions.
Modern connectivity has changed significantly as a result of wireless mobile networks’ utilization of continuous communication across an international infrastructure. Data protection and cyber attacks are two issues that continue to arise as mobile computing and wireless communication networks develop. As 5G networks give way to 6G networks, terahertz communication, artificial intelligence integration, and quantum technologies are introduced to provide high-speed data transfer and communications, along with improved security. In contrast, post-quantum cryptography (PQC) and quantum key distribution (QKD) are two remote methods for addressing the need to adjust cryptographic systems in the current infrastructures to fight impending quantum threats. The fundamental ideas, real-world uses, and ways that PQC and QKD operate together to provide strong security for next-generation networks are all examined in this chapter.
5G is a fifth-generation mobile network that provides efficient wireless communication over the previous generation. It provides faster data speeds, lower delays, and more capacity to connect with many devices simultaneously. In this work, network slicing in 5G networks is discussed with regard to security measures which include QKD(Quantum Key Distribution) and PQC(Post-Quantum Cryptographic). It allows for the formation of numerous granular and independent virtual networks based on a shared physical network. The model explores security where QKD keys address links and encompass PQC to counter other quantum technology threats in the future. Furthermore, there are reliability measures introduced, including route adjustments, with a self repairing capability for link failure in multi-slice networks. In this approach, the security and reliability features are incorporated in 5G network slicing to address the delivery of the services in the next-generation networks.
India's digital public infrastructure — identity, payments, data exchange and online services — was built over a decade under the Digital India programme. A second technology transition is now under way. Quantum computing, quantum communication and quantum sensing are moving from laboratories into early applications, and the National Quantum Mission (2023) commits public funds to building national capability. For governments, the question is no longer whether quantum technologies matter but how to prepare public institutions for them in an orderly way. This policy paper argues that states and central ministries should treat "quantum readiness" as a governance agenda rather than a purely scientific one. It reviews the lessons of Digital India that carry over, identifies four areas in which quantum technologies will affect government (security of digital public infrastructure, decision support, sensing for public services, and the skills base), and proposes a phased roadmap with ten actions across three horizons: protect (2026–2028), pilot (2027–2030) and scale (2030 onwards). The most urgent action is cryptographic: government systems that hold long-lived citizen data should begin inventorying and planning migration to post-quantum cryptography now. The paper is a perspective drawn from the author's experience in state e-governance programmes and in quantum-enabled health technology; it does not report empirical results.