5G, IoT, Blockchain and Quantum Computing Notes for UPSC

Information and communication technology (ICT) is changing the way we work, learn, pay, travel and govern. New technologies such as 5G networks, the Internet of Things, blockchain and quantum computing are being talked about in the news, in government schemes and in the examination. In the UPSC Prelims, you are asked about the meaning and the use of these technologies and the related government missions; in the Mains, you may be asked about their benefits, risks and policy challenges. This note explains each technology in simple words, with tables, India's initiatives and a Mains structure.

5G and the Evolution of Mobile Networks

Each generation of mobile technology brought a new capability. 1G gave analogue voice calls, 2G introduced digital voice and SMS (GSM and CDMA), 3G brought mobile internet, 4G (LTE) gave high-speed broadband, video streaming and apps. 5G gives much higher speed (theoretically many times faster than 4G), very low delay (latency) of a few milliseconds, and the capacity to connect a huge number of devices in a small area.

5G works on three kinds of spectrum bands: the low band (wide coverage, moderate speed), the mid band (a balance of speed and coverage) and the high or millimetre-wave band (very high speed but short range). India held its 5G spectrum auction in 2022, and the services were launched on 1 October 2022 at the India Mobile Congress, and spread to most districts within two years. The government has announced the Bharat 6G Vision (2023) to prepare for the next generation, with local research and standards. The telecom sector is regulated by the Department of Telecommunications and the Telecom Regulatory Authority of India (TRAI, 1997), and a new Telecom Act was passed in 2023. The BharatNet project aims to bring optical fibre broadband to the gram panchayats.

Internet of Things (IoT)

The Internet of Things means connecting physical objects, such as sensors, machines, vehicles, meters and appliances, to the internet, so that they can collect and exchange data without human help. A smart watch, a smart electricity meter and a soil moisture sensor in a farm are examples. The uses are many: smart homes, smart cities (traffic and waste management), precision agriculture, health monitoring, industrial automation (called Industry 4.0), logistics tracking and energy management. The challenges are the security of billions of devices that can be hacked, the privacy of the data, standards that differ between makers and the high energy use. 5G and cloud computing give IoT a strong support.

Blockchain Technology

A blockchain is a distributed digital ledger that records transactions in blocks, which are linked together in a chain by a cryptographic code called a hash. The ledger is shared among many computers (nodes), and all must agree on a new record through a consensus mechanism such as proof of work or proof of stake. Once a block is added, it is almost impossible to change or delete it, so the record is transparent and tamper-resistant, and no central authority is needed.

• Cryptocurrencies: Bitcoin, the first one, was described in 2008 by a person or group using the name Satoshi Nakamoto, and started working in 2009.
• Smart contracts: Programs on the blockchain that execute automatically when the conditions are met, made popular by the Ethereum platform (2015).
• Other uses: Land records and property registration, academic certificates, supply chain tracking, voting systems, health records and the payment systems.

In India, cryptocurrencies are not legal tender. The government has treated them as "virtual digital assets" and taxes the income from their transfer at 30 per cent with a tax deducted at source of 1 per cent, since the Budget of 2022. The Reserve Bank of India has launched the Central Bank Digital Currency (CBDC), called the digital rupee or e-rupee, which is the digital form of the legal currency issued by the central bank, with the pilot starting in late 2022. The challenges of blockchain are the high energy use of some systems, the lack of legal clarity, scalability and the risk of fraud and money laundering.

Quantum Computing

A normal computer uses bits, which can be either 0 or 1. A quantum computer uses qubits, which can be 0, 1 or both at the same time (superposition), and qubits can be linked in such a way that the state of one depends on the other (entanglement). This allows quantum computers to solve some special problems, such as simulating molecules, optimising complex systems and breaking some of today's encryption, much faster than any classical computer. In 2019, Google claimed "quantum supremacy" with its Sycamore processor. The big challenges are decoherence (qubits lose their state very easily because of noise and heat), the need for very low temperatures and error correction.

India approved the National Quantum Mission in April 2023 with an outlay of about Rs 6,000 crore for the period 2023 to 2031, to develop quantum computers, communication, sensing and materials, with hubs in leading institutions. Quantum technology is also a security issue: future quantum computers could break the current encryption, so countries are working on post-quantum cryptography and quantum key distribution.

Other Related Technologies

• Cloud computing: Using remote servers on the internet to store and process data instead of local computers.
• Edge computing: Processing the data near its source (for example, on the device) to reduce the delay.
• Big data and analytics: Analysing huge sets of data to find patterns and make decisions.
• Augmented and virtual reality (AR and VR): Technologies that add digital objects to the real world or create a fully digital world; used in education, training and gaming.
• Semiconductors: The chips that power all digital devices; the India Semiconductor Mission (2021), with a support of Rs 76,000 crore, aims to build a chip manufacturing and design ecosystem.

Digital India and Data Protection

The government has built digital public infrastructure, such as Aadhaar, UPI and DigiLocker, and the Digital India programme (2015) promotes the use of technology in governance. The Digital Personal Data Protection Act, 2023 sets the rules on how the personal data of citizens is collected and used, and creates a Data Protection Board. CERT-In (the Indian Computer Emergency Response Team) handles the cyber security incidents. Our notes on cyber security explain these in more detail.

Mains Angle: Benefits and Risks of Emerging ICT

List the benefits first: faster and wider access to services such as telemedicine and online education, higher productivity in industry and agriculture, transparent governance through digital records, and new jobs in the technology sector. Then discuss the risks: the digital divide that leaves the rural and poor behind, job losses from automation, cyber attacks on critical systems, privacy and data misuse, and the dependence on imported hardware and chips. The way forward includes investment in digital infrastructure and skills, strong data protection and cyber security laws, support to domestic research and manufacturing, and ethical standards for new technologies.

Memory Tip

Remember the four technologies with one word each: 5G - speed and delay; IoT - connected things; blockchain - trust without a middleman; quantum - qubits. Add one Indian initiative to each: the 5G launch of 2022, BharatNet, the digital rupee and the National Quantum Mission.

Practice Questions

• Q1. When were the 5G services launched in India? Answer: 1 October 2022.
• Q2. What is a qubit? Answer: The basic unit of quantum information, which can be 0, 1 or both together.
• Q3. What does CBDC stand for? Answer: Central Bank Digital Currency.
• Q4. Which mission was approved in 2023 for quantum technology? Answer: The National Quantum Mission.

Read it along with our notes on artificial intelligence and green hydrogen and EVs.

Quick Revision

• 5G: high speed, low latency, massive IoT; launched in India on 1 October 2022.
• IoT: sensors and devices connected to the internet; Industry 4.0.
• Blockchain: distributed ledger with hashes and consensus; CBDC is the digital rupee.
• Quantum: qubits, superposition, entanglement; National Quantum Mission (2023).
• DPDP Act 2023; India Semiconductor Mission 2021.

Frequently Asked Questions (FAQ)

What is 5G?

5G is the fifth generation of mobile network, with very high speed, low latency and the capacity to connect many devices.

When were the 5G services launched in India?

The 5G services were launched in India on 1 October 2022.

What is the Internet of Things?

It is the network of physical objects with sensors that collect and exchange data over the internet.

What is a blockchain?

A blockchain is a distributed digital ledger in which records are stored in blocks linked by cryptographic hashes.

What is a smart contract?

A smart contract is a program on a blockchain that executes automatically when its conditions are met.

Is cryptocurrency legal tender in India?

No. Cryptocurrencies are not legal tender in India, and they are treated as virtual digital assets for taxation.

What is a CBDC?

A Central Bank Digital Currency is the digital form of a country's legal currency issued by its central bank, such as the digital rupee.

What is a qubit?

A qubit is the unit of quantum information that can be in a state of 0, 1 or both at once.

What is quantum entanglement?

It is a property where two qubits are linked so that the state of one is related to the state of the other.

What is the National Quantum Mission?

It is the mission approved in 2023 to develop quantum computing, communication, sensing and materials in India.

What is edge computing?

Edge computing means processing the data near its source to reduce delay and bandwidth use.

What is the aim of the India Semiconductor Mission?

It aims to build a chip manufacturing and design ecosystem in India.