BIJU Dharmapalan

The scientific community celebrated April 14 as World Quantum Day to raise awareness of quantum science’s impact across diverse fields

 The world of science is on the cusp of a transformative era driven by the burgeoning field of quantum technology. Quantum science is founded on several key principles that underpin the behaviour of particles and systems at the quantum scale.

 The term “quantum scale” refers to the realm of physics that deals with phenomena occurring at very small scales, typically at the level of atoms, subatomic particles and fundamental particles. It encompasses the principles of quantum mechanics, which govern the behaviour of particles and systems at these tiny dimensions. At the heart of quantum technology lies the principles of quantum mechanics, a branch of physics that describes the behaviour of particles at the smallest scales. Quantum mechanics introduces uncertainty and the notion of superposition, where particles can exist in multiple States simultaneously. Furthermore, entanglement, another fundamental quantum phenomenon, links the properties of particles regardless of distance, enabling instantaneous communication between them. These counterintuitive phenomena, once relegated to the realm of theory, are now being harnessed to create groundbreaking technologies with the potential to revolutionise numerous fields. India has a long and rich history in quantum science. Pioneering work by Satyendra Nath Bose on quantum statistics laid the groundwork for many modern quantum technologies, including Bose-Einstein condensation, quantum superconductivity and quantum information theory.

 Over the past few decades, advancements in quantum science have surged, laying the groundwork for a new era characterised by unparalleled computational power, secure communication and transformative applications across various sectors. One of the most captivating applications of quantum mechanics is the development of quantum computers. These machines leverage the power of superposition to perform calculations exponentially faster than traditional computers. By manipulating qubits (quantum bits) that can be 0, 1, or both simultaneously, quantum computers can explore a vast array of possibilities concurrently. This unparalleled processing power holds immense promise for drug discovery, where simulating complex molecules can accelerate the development of life-saving medications.

 Another revolutionary application of quantum technology is in secure communication. Quantum key distribution (QKD) utilises the principles of quantum mechanics to establish secure cryptographic keys between parties. By encoding information into the quantum States of particles and leveraging entanglement properties, QKD ensures that any attempt to intercept or eavesdrop on the communication would disturb the quantum State, thereby alerting the parties involved.

Quantum cryptography safeguards sensitive information in critical areas like financial transactions, national security communications and protecting intellectual property.

By exploiting the extreme sensitivity of quantum systems to minute changes, scientists are developing sensors capable of detecting the subtlest variations in magnetic fields, gravity and temperature. This has profound implications for medical imaging, where ultra-high-resolution MRIs can provide detailed analyses of tissues and organs, aiding in early disease detection and personalised medicine. In navigation, quantum sensors can lead to more precise GPS and navigation systems, which are crucial for autonomous vehicles and various scientific endeavours. The Government of India, under the Department of Science and Technology, has initiated the National Quantum Mission (NQM), which aims to harness the transformative potential of quantum technology to address national challenges and foster innovation.