April 14 marked World Quantum Day, a global initiative aimed at public understanding of the quantum science and technology that shapes our modern existence. The date itself is a tribute to the fundamental physical constant that birthed this revolution: 4.14 (April 14), representing the first digits of Planck’s constant (eV·s). As India navigates the 21st century, this day serves as a critical juncture to reflect on the transition from classical determinism to a quantum reality ~ a reality that finds a surprising resonance in ancient Indian thought. The story begins in 1900 with Max Planck.
Attempting to solve the ultraviolet catastrophe of blackbody radiation, Planck made a radical assumption: energy is not continuous, but packetized into discrete quanta. This discovery shattered the foundations of classical physics. Planck’s constant became the scale of the universe’s granularity. It was the key that unlocked the door to the subatomic world, leading to the development of quantum mechanics by Bohr, Heisenberg, and Schrödinger. World Quantum Day honours this numerical foundation, reminding us that at the most fundamental level, our universe is governed by discrete values rather than smooth transitions.
For decades, quantum phenomena like superposition ~ where a particle exists in multiple states simultaneously ~ and entanglement ~ the spooky action at a distance where two particles remain connected regardless of separation – were treated as philosophical puzzles or mathematical oddities. Today, these are no longer mysteries; they are experimentally determined facts. Recent breakthroughs in quantum computing and Bell’s theorem experiments have proven that the universe is non-local and probabilistic. We have moved from observing these phenomena to engineering them.
Whether it is through the development of qubits in quantum processors or secure quantum key distribution (QKD) for communication, the weirdness of the quantum world is now the engine of a new industrial revolution. The rise of quantum mechanics signalled the death of Newtonian deterministic materialism. In the Newtonian view, the universe was a giant clockwork mechanism; if you knew the position and momentum of every particle, you could predict the future with absolute certainty. This birthed a rigid causality that left little room for spontaneity or the role of the observer. Quantum mechanics, via the Heisenberg Uncertainty Principle, dismantled this.
It introduced an inherent limit to what can be known. The act of observation itself collapses the wave function, suggesting that the observer is not a detached witness but an active participant in the creation of reality. This shift from a dead materialist machine to a participatory, interconnected universe marks one of the most profound intellectual shifts in human history. While quantum mechanics may sound abstract, it is the silent driver of the modern world. Every time you use a mobile phone, you are harnessing quantum physics. The transistors that form the brain of your device rely on the quantum behaviour of electrons in semiconductors.
Without quantum mechanics, the miniaturization of electronics would have been impossible. Similarly, the Medical Resonance Imaging (MRI) machines in our hospitals are practical applications of nuclear magnetic resonance ~ a quantum mechanical property of atomic nuclei. From the lasers used in eye surgery to the GPS satellites that help us navigate our cities, quantum science is not a futuristic concept; it is the bedrock of our current technological infrastructure. Perhaps the most fascinating aspect of the quantum revolution is its convergence with non-dual philosophy.
Quantum entanglement suggests a fundamental oneness ~ a state where separate entities are, in fact, part of a single, indivisible whole. This mirrors the core tenets of non-dual philosophy aka Advaita Vedanta, which posits that the perceived multiplicity of the world is an appearance (Maya) masking an underlying non-dual reality (Brahman). Renowned physicists like Erwin Schrödinger and Werner Heisenberg were deeply influenced by these Indian philosophical traditions. Schrödinger famously remarked on the parallels between the Upanishadic view of consciousness and the wave-particle duality of quantum states. In the quantum realm, as in Advaita, the distinction between the subject (the observer) and the object (the observed) begins to blur, suggesting that the universe is more like a great thought than a great machine.
In the Indian context, this synthesis was championed by Swami Vivekananda. Long before the term quantum was part of the common lexicon, Vivekananda sought to bridge the gap between ancient wisdom and modern science. He envisioned a Scientific Socialism grounded in the Vedantic principle of equality and the scientific method of inquiry. Vivekananda argued that religion must be as scientific as physics, and science must be as spiritual as religion. He saw in the Advaita philosophy a framework that could accommodate the discoveries of Western science while providing a moral and social structure based on universal brotherhood. For Vivekananda, the realization of oneness was not just a spiritual goal but a prerequisite for a just and progressive society.
His interactions with scientists like Nikola Tesla underscore his belief that the ultimate conclusions of science would eventually align with the insights of the Vedas. As we enter what many call the Second Quantum Revolution, there is an urgent requirement for awareness among India’s Gen-Z. This generation is coming of age at a time when quantum technologies ~ from cryptography to drug discovery ~ will redefine the global economy. However, this revolution requires more than just technical skill; it requires a new way of thinking. Our youth must move beyond the Newtonian mindset of silos and rigid competition and embrace a Quantum mindset of interconnectedness and probability.
Understanding that the universe is fundamentally connected can foster a sense of global responsibility, environmental stewardship, and social empathy. India, with its rich heritage of logic and metaphysics, is uniquely positioned to lead this charge. By integrating the rigorous inquiry of quantum science with the holistic vision of Indian philosophy, Gen-Z can pioneer a future where technology serves humanity without losing its soul. World Quantum Day is not merely a celebration of a constant or a set of equations.
It is a celebration of our evolving understanding of our place in the cosmos. As we acknowledge the transition from the deterministic clockwork of the past to the entangled oneness of the quantum present, India stands at a threshold. By honouring the legacy of Planck and the wisdom of Vivekananda, we can ensure that the quantum dawn leads to a brighter, more integrated future for all.
(The writer is Distinguished Professor, RKMVERI, Belur, and Visiting Professor, IIT-Powa)