Quantum Computers Explained: How Quantum Computing Works

Quantum Computing is the ability to predict the outcome of all possible paths simultaneously and choosing the best path to achieve the desired goal.

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Current quantum computers actually require enormous amounts of energy, but not for the computing itself - rather for the cooling system needed to maintain the quantum bits (qubits) at their operational temperatures. Quantum computers typically need to operate at temperatures near absolute zero - around 0.015 Kelvin (-273.135°C) for superconducting quantum computers. This requires specialized dilution refrigerators and extensive cooling infrastructure that consumes significant power. For example: A typical quantum computing system might use 25-50 kW of power The majority goes to cooling systems, not the quantum processor itself Conventional data centers might use comparable or greater total power, but can run many more computations simultaneously This energy requirement presents one of the major challenges for scaling quantum computers to practical sizes. Current research focuses on: More energy-efficient cooling technologies Alternative qubit technologies that might operate at higher temperatures Quantum processors that require less error correction overhead As the technology matures, we may see improvements in energy efficiency, but the fundamental requirement for extremely low temperatures will likely remain a significant energy consideration for many quantum computing approaches.

This explains what's already explained everywhere. I thought you could explain with a simple example how qbits perform a simple operation like adding two numbers.

Nowhere in this video is it shown how quantum calculations take place. Only the example of coin tossing and entanglement is given. Nothing is explained in this video to satisfy curiosity.

The comparison between a supercomputer and a quantum computer, even if the supercomputer is the fastest ever built, hinges on the fundamental differences in how they operate and the types of problems they can solve. 1. *Supercomputers:* - Supercomputers are built using classical computing principles, where they process information in bits (0s and 1s). They perform operations by executing instructions in a sequential or parallel manner, depending on how many processors are used. - The "fastest supercomputer" would still be bound by the limits of classical computation, no matter how advanced. For example, while they can solve complex calculations incredibly fast, certain types of problems (like factoring large numbers, simulating molecular interactions, or optimizing large-scale problems) become exponentially harder as the size of the problem increases. 2. *Quantum Computers:* - Quantum computers, on the other hand, leverage quantum bits (qubits), which can exist in a superposition of states (both 0 and 1 simultaneously). They also take advantage of quantum entanglement and quantum interference to process information in a fundamentally different way. - A quantum computer can potentially solve specific problems far faster than any classical supercomputer, especially for problems that scale exponentially in difficulty with classical computation. For instance, quantum computers are expected to revolutionize fields like cryptography, materials science, and drug discovery by solving problems that classical computers would take thousands or millions of years to complete. Can the fastest supercomputer compare to a quantum computer? In terms of raw power for solving classical problems, a supercomputer will always be more powerful than a quantum computer simply because supercomputers are designed to handle a broader range of tasks efficiently. But when it comes to certain specialized problems—like factoring large numbers (which is important for cryptography), simulating quantum systems (which classical computers struggle with), or other quantum-related problems—quantum computers have the potential to outperform supercomputers by orders of magnitude. *Conclusion:* Even the fastest supercomputer likely can't "compete" with a quantum computer on problems tailored to quantum algorithms. However, for general-purpose tasks, supercomputers are still the dominant force, and quantum computers are expected to complement classical computing, rather than fully replace it, at least for the foreseeable future.

So a regular computer thinkings steps-by-steps, but a quantum computer overthinks and has solutions for each over thinking thought

I understand the theory. But what I dont understand is how to actually make the computer work physically. How to control each eletron's state as what you want? How to control if you want two qubits to entangle or not? How do you interpet all 0001 0000 0010 etc...into something meaningful?

Why are there videos about them but no videos of demonstrations

All they say is it'll be faster but they don't say exactly how.

you explained it very well.. The state of simultaneous existence of both 0 and 1 is - property of Superposition, which could be well understood by "Schrodinger cat" analogy.. And - the property of multiple qubits linked with multiple states is "entanglement". Very well put in an easier way. Thanks

The spinning coin analogy for superposition made this so much easier to visualize, Great breakdown of such a complex topic. ⚛

0:15 stockfish laughing in corner😂😂😂

Quantum computing reminds me of the very first computers we had they were huge machines now we have a computer the size of a cellphone 📲 some day someone will be looking 👀 back at this video and say the same thing!

that was one of the most underestandable vids about Q-bits that anyone can find all over the internet

Quantum computer: "Would you like to play a game?"

Congrats on the video, i liked the analogy with the coin. I think the smartest question here and its the reason why people do not understand it is this. Why our basic computers cannot recognize a coin as both and the quantum computers do? We understand the concept of both states but why werent all computers did that from the start? What was the obstacle then and the solution now?

Wow a clear and useful explanation

Whats wolverine deadpool superman doing there who had them there has a example but nice explanation

If you had access to a quantum computer for one day, what problem would you solve? Cure a disease? Break an encryption? Predict the stock market? Fun fact: Google's Sycamore processor solved in 200 seconds what would take the world's fastest supercomputer 10,000 years! Want to understand the quantum physics behind it all? ▶ Start here: Quantum Mechanics Explained – /p9pPjASnnxw Drop your answer below!