Computer Electronics

Quantum computing and its applications

10 January 2024
An IBM Q cryostat used to keep IBM’s 50-qubit quantum computer cold. Source: IBM Research Flickr/CC BY-ND 2.0

Quantum computing uses the principles of quantum mechanics to tackle problems that traditional computers just can't handle. Supercomputers are utilized by scientists and engineers whenever they face challenging problems. These massive classical supercomputers can execute complex artificial intelligence (AI) and calculations thanks to their thousands of classical CPU and GPU cores. But even the most advanced supercomputers use transistor technology from the 20th century and operate on binary code. Some types of problems are particularly difficult for them to solve.

Qubits, derived from the fundamental building block of quantum mechanics, are the building blocks of quantum computers, which depart from classical computing based on bits. This departure opens doors to a plethora of possibilities once deemed unattainable.

Quantum fundamentals

Qubits and superposition

At the core of quantum computing lies the qubit, a contraction for quantum bit. Unlike classical bits constrained to states of 0 or 1, qubits bask in a superposition of states. This unique feature enables a qubit to embody both 0 and 1 concurrently, exponentially enhancing the computational capabilities of a quantum computer.


Another distinctive quantum phenomenon is entanglement, where qubits establish correlations in a manner that the state of one qubit directly influences another, irrespective of their spatial separation. This phenomenon facilitates swift communication and computation.

Quantum gates

Quantum gates, akin to classical logic gates, play a pivotal role in quantum computing. They manipulate the states of qubits, facilitating the construction of quantum circuits. The interplay of quantum gates, superposition, and entanglement forms the bedrock of quantum algorithms.

Quantum algorithms

Shor's algorithm

Among the renowned quantum algorithms, Shor's algorithm stands out. It efficiently factors large numbers at an exponential pace compared to the most advanced classical algorithms. This poses a substantial challenge to prevailing cryptographic systems relying on the complexity of factoring large numbers.

Grover's algorithm

Addressing the search problem, Grover's algorithm provides a quadratic acceleration over classical counterparts. Its applications extend to searching unsorted databases and resolving specific mathematical challenges efficiently.

Quantum machine learning

The intersection of quantum computing and machine learning is noteworthy. Quantum machine learning algorithms, including the Quantum Support Vector Machine (QSVM) and Quantum Neural Networks, offer accelerated processing for intricate tasks, presenting a potential advantage in the era of voluminous data.

Quantum computing in practicality

Quantum cryptography

While Shor's algorithm poses a threat to conventional cryptographic systems, quantum cryptography offers a remedy. Quantum key distribution (QKD) ensures secure communication by leveraging quantum mechanics to detect any illicit interception attempts.

Optimization problems

Quantum computers excel in tackling optimization problems. From logistics and supply chain management to financial portfolio optimization, quantum algorithms navigate expansive solution spaces to deduce optimal solutions more swiftly than classical algorithms.

Drug discovery and material science

The computational demands of molecular interactions in drug discovery and material science make quantum computing indispensable. Quantum computers can model molecular structures with heightened accuracy, hastening drug discovery processes and facilitating the design of novel materials with specific properties.

Climate modeling

The intricate nature of climate systems necessitates advanced simulations. Quantum computers bring accuracy and speed to the modeling of complex climate systems, aiding researchers in devising effective strategies for environmental preservation.


Quantum computing holds the potential to enhance AI capabilities. Quantum algorithms contribute to refining machine learning models, expediting training processes, and improving the precision of predictions in diverse AI applications.

Challenges and future outlook

While quantum computing opens unprecedented avenues, it grapples with substantial challenges. Quantum computers are highly susceptible to environmental factors and demand extremely low temperatures to maintain qubit coherence. The ongoing pursuit of error correction in quantum systems underscores the commitment of researchers to overcome existing obstacles.

It is not something the average person can easily access or utilize in their daily life. Quantum computers are highly specialized machines that require extremely low temperatures and carefully controlled environments to maintain the delicate quantum states of qubits. The technology is still in its early stages, and quantum computers are primarily developed and operated by research institutions, tech companies and organizations with substantial resources. However, the trajectory of quantum computing promises exciting prospects. With advancing technology, we anticipate the evolution of more robust quantum hardware, error-corrected quantum systems and the democratization of quantum computing power.


In summary, quantum computing transcends theoretical abstraction, evolving into a swiftly progressing domain with tangible applications. From revolutionizing cryptography to hastening scientific discoveries and resolving intricate problems, quantum computing is poised to redefine our technological landscape. As we unravel the enigmas of quantum mechanics, the applications of quantum computing will expand, ushering in a new era of computation and problem-solving.

The journey into the quantum realm has just commenced, and the possibilities are as boundless as the superposition of a qubit. As researchers and innovators push the boundaries of quantum computing, we can only anticipate the transformative impact it will have on industries and scientific pursuits globally.

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