Quantum physics is the study of matter and energy at the primary level. It aspires to uncover the properties and behaviours of the very building blocks of nature. While many quantum experiments inspect tiny objects, such as electrons and photons, quantum phenomena are all in the region of us, acting on every scale. Quantum physics is hard to believe. It’s really mind-blowing. It’s a science of the very small. The branch of physics that studies the bizarre world of atoms, particles, and waves.
Introduction to Quantum Physics
Nowadays, it is a fascinating thing to learn about quantum physics. Some fundamental questions arise in science, like how objects behave in the quantum world. Albert Einstein won a Nobel Prize for proving that energy is quantised. The quanta here are the Planck constant, named after Max Planck, the godfather of quantum physics. He was trying to get to the bottom of a problem with our understanding of hot objects like the Sun. Our most fantastic theories couldn’t match the observations of the energy they emitted. By proposing that energy is quantised, he was able to get theory neatly into line with experiments.
Here are just ten facts about quantum physics that might blow your mind also in 2023
Matter exists as both particle and wave
1906, J. J. Thomson won the Nobel Prize for showing that electrons are particles. In 1937, his son George won the same prize for showing that electrons are waves. Both were right – the phenomenon is now known as wave-particle duality and is a keystone in quantum physics. At times the light is best understood as an electromagnetic wave, but at other times it’s more beneficial to see it as a stream of photons.
Like a giant light bucket, a telescope collects photons from distant stars. But it can also focus light waves from those stars and exert pressure on an object. In fact, we are by now using this phenomenon, launching spacecraft with solar sails, with the chairman of the B612 Foundation, Rusty Schweickart, indicating that we may be able to manoeuvre asteroids off collision courses with Earth.
Energy comes in multiples of quanta
The quantum world is like a shoe store. The connection between the quantum world and shoes is comparable to the relationship between the subatomic world and energy. Shoes don’t come in sizes that match your feet accurately, so you must choose between pairs in predetermined sizes. The same goes for energy; it only comes in multiples of the same “quanta” — hence the name quantum physics.
Something can exist in two dimensions at the same time
One of the main known theories regarding quantum physics is that objects can be in two places simultaneously. This is well-known as superposition, first discovered in 1927 by physicist Erwin Schrödinger, and it proposes that an object’s existence is spread out over time and space. This means that if you were to measure the position of an electron on one side of a barrier, it could, in fact, be in two locations at once. The idea that an object can exist in multiple states at once seems like something out of science fiction but is the basis of the famous Schrödinger’s cat thought experiment. The cat’s fate is governed by a quantum device, illustrating how quantum mechanics is counterintuitive and that the cat can exist in two states – dead and alive.
Stars are characterised by quantum physics
Danish Physicist Niels Bohr showed us that electrons in atoms come in clusters like grapes on a vine, known as energy levels. When an electron jumps from a higher to a lower energy level, it releases energy as light. In the same way, if you put more electrons into an atom at high energy levels, it absorbs light of those frequencies. Astronomers use this effect to identify the composition of distant stars. When we break up their light into a rainbow-like spectrum, we see missing colours – representing the presence of specific chemical elements and permitting us to work out the constituents of stars and what elements they contain, clues to their age, and other characteristics.
There is strong evidence pointing towards a possible multiverse
Quantum physics suggests that parallel universes may exist where every probable outcome has happened and continues to happen in some other universe. It also proposes that we could travel between these parallel universes by manipulating the fabric of space-time itself! An explanation of quantum physics, Copenhagen, states that observation collapses the wave function and forces reality to formulate a quantum choice. The many-worlds interpretation argues that there isn’t really a choice. In its place, at the moment of measurement, reality splits into two versions in which we witness two different outcomes.
Imagine a quantum particle as a ball being bounced between two mirrors. Every time the ball hits one of the mirrors, it bounces off in a different direction and continues bouncing for an infinite amount of time. Physicists call this phenomenon decoherence.
It is the basis behind why the sun shines
When you look up at the sun, you see the light created by nuclear fusion in its core. Nuclear fusion is the process of two protons coming together to create a larger particle. This larger particle can be anything from helium to heavier elements like carbon, oxygen, and iron. When these exact charges repel one another (which physicists term the Coulomb barrier), this causes them to give off light in a process called fluorescence, hence helping the sunshine.
Stars don’t really go away, I completely
Eventually, the sun will die. Our star will collapse from gravity, but not completely. As it gets smaller, more particles are crammed together. Here, the Pauli Exclusion Principle, which states that certain particles, like electrons, cannot stay in the same state, comes into play. This means that quantum physics prevents the star from collapsing beyond a certain point by releasing extra energy whenever gravity tries to crush it further down. Essentially, dead stars don’t actually collapse into black holes as we might expect – instead, they take on the form of what we now know as a white dwarf.
Black holes disappear over time
The Heisenberg uncertainty principle states that you can’t wholly know two properties of a system at the same time. For example, if you want to know exactly where something is in space, you can’t know exactly how fast it moves. In 1974, Stephen Hawking understood that black holes are not entirely black but emit radiation. This happens at a black hole’s boundaries, where some particles escape while others are swallowed by the black hole. Eventually, the black hole will evaporate as it is constantly shedding mass and energy.
It accounts for the size of the universe
In the beginning, there was the Big Bang Theory. Then in the 1980s, that theory was modified to comprise a different theory, inflation. A new idea was formed that the universe grew rapidly before quantum fluctuations linked to the Heisenberg uncertainty principle could disappear. As a result, energy is concentrated in some areas rather than others – seeds around which material can gather to form the clusters of galaxies we can watch now. In fact, everything from galaxies to planets is formed from quantum fluctuations in space-time itself!
Things can get disturbing
Quantum physics also has some bizarre implications for our everyday lives. These include weird effects like quantum entanglement, where two particles can be connected to affect each other no matter how far apart, and quantum tunnelling, where an object can pass through an energy barrier with faster-than-light communication. These bizarre phenomena permit particles separated by vast distances to be or stay connected at a quantum level; it’s like an invisible force connecting them, almost like magic!
Conclusion
Quantum physics is a blend of math and logic, so it is the right subject for people who love solving puzzles.
So what’s next?
Although we’re still in the early stages of quantum technology, the potential is becoming clear. Quantum use will enable scientists and researchers to:
- Accelerate drug and material development in healthcare.
- Enhance national security and support defence.
- Boost productive mineral exploration and water resource management for mining and other sectors.
- Improve secure communications for industries like Space.
