Introduction
It seems that quantum physics is one of the strangest and most mind-bending areas of science. It is a part of physics that studies the behavior of matter and energy at the tiniest scales possible, such as atoms, electrons, photons, and other subatomic particles.
There are various statements you may have heard, such as “Particles can exist in two places at once,” “Observation changes reality,” and “Two particles can communicate instantly across vast distances.” These are some of the strangest ideas associated with quantum physics.
Even though these ideas may seem bizarre, the truth of the matter is that without quantum physics, much of modern civilization wouldn’t exist. Believe it or not, the smartphones in our pockets, the computers we use, GPS navigation, medical imaging devices, lasers, and much of the internet all rely on technologies built upon quantum principles.
In this blog, I will take a look at what quantum physics is, why it appears so strange, and how it quietly shapes the modern world around us every day.
What Is Quantum Physics?
Quantum physics is the study of nature at extremely small scales. Classical physics is a little different and was developed by people like Isaac Newton. Classical physics works extremely well when describing soft balls, stars, cars, and other larger material things.
When scientists began looking at atoms and subatomic particles, they found out that the universe acts very differently at extremely small scales. The old rules of classical physics seemed to no longer work.
It seemed that particles behaved in ways that went against common sense. This is what led to the development of quantum mechanics, which ended up being one of the most successful scientific theories ever created.
The Quantum Revolution
There were several scientists who helped with quantum theory, such as Max Planck, Albert Einstein, Niels Bohr, Werner Heisenberg, and Erwin Schrödinger. These discoveries showed that energy and matter are not always continuous. Rather, many physical properties occur in discrete packets called quanta. These ideas helped to completely transform physics.
Wave-Particle Duality
One of the strangest ideas of quantum physics was that particles like electrons could operate as both a particle and a wave. Light also demonstrates a similar behavior. Sometimes light acts like a wave; sometimes it behaves like individual particles called photons. This idea is called wave-particle duality. This challenged our everyday intuition because objects in our normal experience are usually either particles or waves, but not both.
The Double-Slit Experiment
One experiment that became popular in quantum physics is something called the Double-Slit Experiment. This is where scientists fired particles like electrons to a barrier containing two slits (small openings). The particles produced an interference pattern similar to waves, which surprised scientists. Even stranger yet, when scientists tried to determine which slit each particle passed through, the interference pattern disappeared. This was weird because it seemed to suggest that observation somehow affects outcomes. This is one of the most fascinating and debated findings in science.
Quantum Superposition
Superposition is another strange concept. When it comes to quantum theory, a particle can exist in a variety of possible states simultaneously until measurement occurs. There is a common illustration in the thought experiment known as Schrödinger’s Cat. In this scenario, the cat is described as being both dead and alive until the box is opened and observed. This parallels the idea of particles behaving differently when observed than when not observed. The example isn’t literal. However, it demonstrates how quantum systems can exist in multiple possibilities at once.
Quantum Entanglement
Quantum entanglement is one of the most mind-bending phenomena out there. When particles become entangled they remain connected regardless of distance. In other words, changing the state of one particle will immediately influence the description of the other. Einstein found this quite troubling. He referred to it as “spooky action at a distance.” This entanglement has been repeatedly confirmed through many experiments and is helping to build the foundation of future technologies.
How Quantum Physics Is Used Today
Quantum physics is quite practical which may be surprising for some. There are many things in modern technologies that exist because scientists learned how to harness quantum effects.
1. Computers and Semiconductors
All computers, smartphones, and tablets rely on semiconductors. The reason semiconductors function is because of the quantum behavior within materials. A world without quantum physics would be a world without laptops, smartphones, and modern computing. Quantum physics plays a large part in the digital revolution.
2. Lasers
There are many things that lasers are used in such as fiber-optic communication, manufacturing, barcode scanners, entertainment, and medicine. Laser technologies rely directly on quantum transitions with atoms. Lasers wouldn’t be possible without quantum physics.
3. Medical Imaging
Quantum ideas are used in modern medicine when it comes to such things as MRI machines, PET scans, and advanced diagnostic equipment. Technologies such as these allow doctors to see internal structures without the use of invasive surgery. There have been many lives that have benefitted from quantum-based medical tools.
4. GPS Navigation
You may be amazed at the idea that quantum physics helps your GPS function correctly. Satellites that use GPS rely on extremely precise atomic clocks. Quantum principles are what operate atomic clocks. If it weren’t for these clocks, GPS systems would become inaccurate. Any time you use your phone for navigation, you’re benefitting from quantum physics.
5. Solar Panels
The photoelectric effect is how solar panels convert sunlight into electricity. When it comes to renewable energy expansion, quantum mechanics continues to play an increasingly important role.
The Future: Quantum Computing
Quantum computing is one of the most exciting developments today. Ordinary computers use bits represented as “0, 1.” However, quantum computers use such things as qubits (quantum bits). Since qubits can exist in superpositions, there is a chance that they may eventually solve certain problems a lot quicker than regular computers. Potential applications of quantum computers could have applications when it comes to drug discovery, artificial intelligence, climate modeling, cryptography, materials science, and climate modeling. Quantum computing is in its early stages, but it could become one of the most important technologies of this century.
Does Quantum Physics Mean Reality Is Weird?
One of the things that quantum physics does is that it raises profound philosophical questions. This has attracted a lot of public interest. Scientist still debate on how quantum mechanics should be interpreted. A few interpretations include: the Many-Worlds Interpretation, The Copenhagen Interpretation, Objective Collapse Theories, Pilot Wave Theory. Each of these things is trying to explain what quantum physics is telling us about reality. What makes things strange is that these interpretations often make the same predictions while offering extremely different explanations. Scientists still disagree about what quantum theory ultimately means.
Common Misconceptions
When it comes to pop culture, quantum physics is often misunderstood. It does not prove magick, manifestation, telepathy, or supernatural powers. While it can’t be denied that quantum physics is weird, its predictions are based on careful experiments and mathematics.
Conclusion
Quantum physics remains one of humanity’s greatest achievements. It shows that reality acts in ways that are far stranger than our everyday mundane experience suggests. It gives us ideas such as that particles can behave like waves, objects can exist in superpositions, and entangled particles can remain connected across a wide distance. It helps with our electronical devices. It seems that modern society is built upon discoveries that were one time viewed as impossible.
Quantum physics will likely become more important in shaping the future. It is weird and it is fun to research. However, it is exciting that it will likely lead to new discoveries that can be used to improve the world.
See Also
The Insane Reality of Neutron Stars
The Parallel Universe Question: Is There Evidence for Other Realities?
The Double Slit Experiment: When Reality Stops Making Sense
The Theory of Relativity Explained: Why Time Isn’t What You Think
Why is the universe bigger than it should be?
Further Reading (Affiliate Links):
QED: The Strange Theory of Light and Matter by Richard P. Feynman and Anthony Zee
Six Easy Pieces by Richard P. Feynman, Robert B. Leighton, and Matthew Sands
In Search of Schrödinger’s Cat by John Gribbin
Beyond Weird by Philip Ball
Something Deeply Hidden by Sean Carroll
What Is Real? by Adam Becker
Helgoland by Carlo Rovelli
The Quantum Story by Jim Baggott
Introduction to Quantum Mechanics by David J. Griffiths