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Quantum Technology: National Quantum Mission & Qubit Roadmaps ​

UPSC Mains PYQs
  • Quantum Computing & NQM (2021): "What is quantum computing? Explain how it differs from traditional classical computing. Discuss the objectives and strategic importance of the National Quantum Mission (NQM) in securing India's critical digital infrastructure." (15 Marks, 250 Words)
📊 High-Yield Data & Statistical Fact Sheet
  • Quantum Tech & Mission Metrics:
    • Sovereign Budget: ₹6,003.65 Crore allocated over 8 years (2023-2031), placing India among 6 global nations with dedicated quantum funding.
    • Qubit Scale Roadmap: Targets building physical quantum computers scaling from 50 to 1,000 physical qubits by 2031.
    • NQM Structure: Focuses on 4 thematic hubs (T-Hubs) across premier research institutes.
    • Entangled QKD Range: Free-space QKD demonstrated over 300 meters (ISRO/DRDO) and fiber-based QKD over 100+ kilometers.
    • Decryption Threat: Shor's algorithm running on a 4,000 logical qubit machine can break 2048-bit RSA keys in under 10 seconds.

India's Qubit Scaling Pathway (Physical Qubits)

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NQM Thematic Distribution (Thematic Hubs)

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1. CLASSICAL VS QUANTUM COMPUTING ​

  • Qubits vs Bits: Classical computers process data using binary bits (either 0 or 1). Quantum computers use quantum bits (qubits), which can process data far more efficiently.
  • Key Quantum Principles:
    • Superposition: Qubits represent 0, 1, or a combination of both simultaneously, enabling parallel computational paths.
    • Entanglement: A quantum state where paired qubits remain linked regardless of physical distance, allowing secure and fast data transmission.
  • The Decoherence Challenge: Environmental noise (temperature shifts, electromagnetic interference) causes qubits to lose their quantum state, requiring sub-Kelvin dilution refrigerators.

2. THE NATIONAL QUANTUM MISSION (NQM) TIERS ​

  • T-Hub 1: Quantum Computing: Focused on building superconducting, ion-trap, and photonic platforms, targeting a 1,000 physical qubit machine by 2031.
  • T-Hub 2: Quantum Communication: Establishing secure, long-distance Quantum Key Distribution (QKD) links over satellite (inter-city) and fiber-optic networks.
  • T-Hub 3: Quantum Sensing & Metrology: Developing high-accuracy atomic clocks for NavIC satellites, and quantum gravity sensors for precise underground mineral mapping.
  • T-Hub 4: Quantum Materials: Engineering topological insulators and novel materials to manufacture high-coherence indigenous quantum computer chips.

3. GEOPOLITICS, CRYPTOGRAPHY & SECURITY ​

  • RSA Decryption Vulnerability: The future deployment of cryptanalytically relevant quantum computers running Shor's algorithm threatens to crack modern encryption, endangering state intelligence and financial ledgers.
  • Post-Quantum Cryptography (PQC): Developing quantum-safe mathematical algorithms to protect existing databases before quantum advantage is reached ("harvest now, decrypt later" threat).
  • Supply Chain Decoupling: Quantum components (e.g., cryo-refrigerators, stable isotopes, specialized lasers) face export restrictions. ANRF and NQM promote local manufacturing to secure technological sovereignty.

QUICK REVISION BOX ​

  • Classical Basic Unit: Bit (0 or 1).
  • Quantum Basic Unit: Qubit (in superposition).
  • Subatomic Interlinkage Property: Entanglement.
  • Quantum Hardware Loss Event: Decoherence (noise-induced).
  • RSA Cryptography Breaker: Shor's Algorithm.
  • Secure Key Exchange Tech: QKD (Quantum Key Distribution).
  • NQM Total Outlay: ₹6,003.65 Crore (over 8 years).

Notes updated up to March 2026. Sources: DST NQM Secretariat, WIPO Patent Statistics.

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