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What is Quantum Computing and How it Works? Examples & Applications

Published on 1/12/2025

What is Quantum Computing and How it Works? Examples & Applications

Quantum Computing is an innovative technology that possesses and analyzes data at speed faster than traditional computers. It works using the special rules of physics, like superposition and entanglement to solve problems where regular computers can’t handle easily. This technology has the potential to improve supply chain, healthcare, medicine, machine learning and cyber security. As more businesses explore its possibilities, quantum computing reshape our digital world and open up new opportunities in future.

Quantum Computing Definition and Explanation

Quantum Computing is a comprehensive field containing aspects of Mathematics, Computer Science and physics that uses quantum mechanics to solve complex problems. Unlike traditional computers that rely on bits which are either 0 or 1, here quantum computers use “qubits” that can be 0 or 1 or both. This is because “superposition” allows quantum computers to handle vast amounts of information at once.

Quantum Computers also use “entanglement”, a special connection between qubits and helps them to work together in unique and capable ways. These features make quantum computers solve complex problems much faster. These technologies have the potential to transform areas such as AI, machine learning, scientific research, and cyber security by enhancing efficiency and easy to process vast amounts of data. 

How Quantum Computing Works?

Quantum Computing is based on the principles of quantum mechanics, which describes how tiny particles, such as atoms and electrons behave. Here’s the steps of how it works-

Qubits, Gates & Quantum Circuit:

In quantum computing quantum gates are used to manipulate qubits, which are fundamental components of quantum circuits. Quantum gates perform the operations on qubits, which are similar to classic logic gates. Quantum gates manipulate the probability of qubits through rotations in multi-dimensional, unlike the classical logic gates which operate on bits.

Quantum Processor utilizes qubits to possess and manage the information based on the quantum mechanics. 

By integrating quantum gates, quantum circuits are formed, these circuits enable qubits to implement a series of operations unlocking the complex problem solving capabilities. 

Who are the Major 5 Players in Quantum Computing?

Advancement of Quantum Computing companies are emerging globally. However, this landscape has been packed with innovative startups, and few industry giants have placed themselves as pioneers in this quantum space. Here is a list of a few companies that are driving this advanced technology forward. 

  1. IBM

IBM is one of the top leaders in quantum computing and a modular quantum computer powered by an IBM introduced “Heron Chip” which features error correction to combat decoherence. Recently, it introduced Condor, a 1,121-qubit processor using cross resonance gate technology, also it aims to develop a 1,00,000-qubit quantum by 2033. 

  1. Google Quantum AI

Google Quantum AI announced that it has achieved “Quantum Supremacy” in 2019 with its quantum computer Sycamore by sampling a problem faster than supercomputers do. IBM challenged this, saying its supercomputers could perform the task faster. Google plans to develop 1 million qubits within a next decade. Additionally, it also created Cirq, an open source framework created to develop new quantum algorithms for near term quantum computers. 

  1. Amazon

Amazon Web Services (AWS) set up a quantum computing center at Caltech in 2019. AWS provides Amazon Braket, a managed service that grants access to quantum hardware from Rigetti, IonQ, Oxford quantum circuits which allows users to explore different  hardware options to meet their specific requirements. 

  1. Microsoft

Microsoft Azure offers tools and resources for quantum computing and is actively developing a scalable and fault- tolerant quantum computer. The Azure Quantum offers access to quantum hardwares, simulators and tools for experimenting with quantum algorithms and their possibilities.  

  1. Intel

Intel has been focused on creating a comprehensive full stack commercial computing system. Recently, it released a  12 qubit silicon chip named “Tunnel Falls”, aimed to boost silicon spin qubit research. This chip will be accommodated into Intel’s quantum system  using quantum software development kit.

Applications Of Quantum Computing with Examples

Quantum Computing has the ability to own huge amounts of information simultaneously. It is composed to revolutionize industries with its problem solving ability that are currently unmanageable for traditional computers. 

  1. Drug Discovery: Quantum Computers can efficiently simulate molecular interactions, allows the researchers to identify potential treatments faster and helps in designing new drugs. 

Example- 

TCS has been exploring quantum computing to advance molecular and chemical simulations. By utilizing quantum algorithms TCS seeks to accelerate the discovery and design of new drug molecules, particularly for challenging diseases like cancer. Their efforts focus on developing hybrid quantum classical models to boost computational efficiency.

  1. Financial Modelling: Quantum Computing transforms the financial sector with its exceptional ability to analyze and process huge amounts of data. It is ideal for complex tasks like risk analysis, fraud detection and portfolio management. 

Example-

One of the world’s largest banks JP Morgan Chase collaborates with IBM through it’s quantum network.They focus on developing quantum algorithms for risk analysis and understanding how quantum computing can be used for financial by-product pricing and error reducing techniques in quantum systems. 

  1. Cryptography and Cybersecurity: With the approach of quantum computing, classical encryption methods could become a challenge due to its vulnerability to quantum attacks. As a result, the development of quantum resistant algorithms has become crucial to secure sensitive data against future threats. 

Example-  

Wipro is in collaboration with global partners, in advancing post quantum cryptographic techniques to protect data security across industries like banking, e-commerce and healthcare. 

  1. Artificial Intelligence: Quantum Computing holds the potential to transform AI by predominantly accelerating AI model training and optimization processes, resulting in faster and more accurate predictions. 

Example-

QpiAi, an Indian start up combines AI and Quantum Computing to highlight the challenges in fields such as drug discovery. With the help of quantum machine learning they aim to reduce the cost and time which is associated with developing new medicine. 

Advantages of Quantum Computing

  1. Rapid Calculations At Unwanted Speed: Quantum Computers can perform calculations more quickly than classical computers by utilizing the principles of quantum mechanics to process information in parallel. This capability allows them to run complex algorithms faster, allows them to tackle problems that are currently beyond the reach of classical computers due to computational limitations.
  2. Efficient Data Management: Quantum Computing uses a quantum memory system for storing data. Qubits can store and process huge amounts of data in quantum states, which allows high density storage and quicker access compared to classical storage systems. This enables quantum computers to manage large datasets with greater efficiency, making data intensive applications like machine learning and data analysis. 
  3. Mastery In Solving Complex Problems: Using Mathematical calculations, optimisation and simulation quantum computing solves intricate problems. Here, with the help of quantum mechanics, quantum algorithms  find optimal solutions to optimization problems, affect quantum systems with high accuracy and solve cryptographic challenges efficiently. 
  4. Transforming Google Searches: Quantum Computers has the capability to transform search algorithms and information retrieval systems, including google searches. By utilizing quantum algorithms large datasets can be processed more efficiently, which could improve user experiences, enhance search engine performance and enable new capabilities like personalized recommendations and predictive search. 
  5. Improving Privacy Standards: Quantum Computing elevates privacy through advanced encryption and cryptographic methods. Quantum Cryptography uses the method of quantum mechanics to build secure communication channels that are extremely difficult for unauthorized parties to spy on or hak into. This results in privacy and data security in digital networks, securing sensitive information from unauthorised access and interception.

Disadvantages Of Quantum Computing

  1. Inconsistency & Error Rates: Quantum Computers operate using qubits, which are highly sensitive to environmental disruptions like temperature fluctuations or electromagnetic interference which leads to computational errors. It works in extremely cold temperatures which are close to “Zero”. Quantum Error correction techniques are essential, however they require additional qubits, adding complexity. 
  2. Lack of accessibility to public: Quantum Computing resources are scarce and have restricted access to the Universities, research centers and large tech players, leaving individuals and small organizations which exclusively face significant barriers to gain access.  This limitation affects the broader adoption and innovation in the quantum computing space. 
  3. Designing Algorithms with Quantum Precision: The development of quantum computer algorithms necessities a strong foundation in quantum mechanics and specialized technical skills. Researchers must carefully craft the algorithms to utilize unique properties of qubits. Additionally,  the abstract nature of quantum computing systems makes complexities like debugging and optimization which makes this field more challenging. 
  4. Tackling Challenges In Internet Security: Quantum Computing poses a challenge or threat to existing cryptographic systems which are used to secure digital communications and data. Shor’s algorithm can efficiently jeopardize popular encryption methods such as RSA and ECC. To counter this, it is essential to develop quantum- resistant cryptographic algorithms and adopt quantum- safe encryption solutions, ensuring strong cyber security in this quantum space. 
  5. Complexity In Construction: Quantum Computing requires a high cost to build a quantum hardware and the necessary infrastructure such as cryogenic cooling systems, can be substantial. Moreover, the continuous maintenance and expertise required to quantum systems further add to the expense. As a result, adoption of quantum computing remains a distant prospect rather than an immediate possibility. 

Future Of Quantum Computing

Although quantum computing faces challenges, its future looks promising. Quantum computing adoption will undoubtedly gain momentum by 2025. The future of “Quantum Computing” has the potential for revolutionizing industries like healthcare, finance and algorithms. In India, initiatives such as TCS “Quantum Computing Lab” and IISC Bengaluru’s Quantum Technology programs are driving advancing research in this field. Startup’s like QNu labs are working on quantum-secure communication technologies to secure cybersecurity. The Government Of India invested Rs.8000 crore in the “National Mission on Quantum Technologies and Applications” aiming to build quantum algorithms and infrastructure. With the continuous adoption of quantum computing, transform technology and redefine problem solving in the decades ahead.

Conclusion

In Conclusion, Quantum Computing stands at the forefront of innovation in diverse fields, from healthcare to finance and even in space exploration. Although it's still developing, it has a potential to address the world's hardest problems is undeniable. As research continues it’s set to revolutionize problems, opening doors to innovations and reconsidering how we approach data processing and problem solving in the future. Major tech players and startups alike utilizing this technology on the other side governments are also highly investing in its growth. The journey has just began, and the possibilities are immense.

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