## Definition

A Quantum Computer is a type of innovative computing system that leverages quantum mechanics, the theory of physics that governs the smallest particles in the universe. Unlike classical computers that use bits (0s and 1s) to process information, Quantum Computers use quantum bits (qubits), which can exist in both states simultaneously due to a principle known as superposition. This allows quantum computers to process a vast number of possibilities all at once, providing exponential computational power compared to traditional computing systems.

### Phonetic

**The phonetic pronunciation of the keyword “Quantum Computer” is: Kwahn-tuhm Kuhm-pyoo-tuhr**

## Key Takeaways

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- Quantum Computers use Quantum Bits (Qubits) – Unlike classical computers that use bits (0s and 1s) for computing, Quantum Computers use Qubits. A Qubit is a quantum system that encodes a 0, 1, or both at the same time, thanks to a principle called Superposition.
- Quantum Computers are incredibly powerful – Due to another principle called Entanglement, Qubits that are entangled can influence each other instantly no matter how far apart they are. This makes Quantum Computers exponentially faster and more powerful than classical computers for certain types of calculations.
- Quantum Computers have great potential but are still in early stages – While Quantum Computers hold promise in fields like cryptography, data analysis, and machine learning, they are currently fragile, expensive, and not yet ready for widespread, practical use. Thorough research and development is still ongoing.

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## Importance

Quantum computing is important because it represents a major leap forward in how we process and compute data. Instead of using traditional bits, quantum computers use quantum bits, or qubits, which have the ability to exist in multiple states at once due to the principles of quantum mechanics. This significant increase in computing power allows quantum computers to perform complex calculations and solve certain types of problems many orders of magnitude faster than classical computers. It holds immense potential for developments in fields like cryptography, AI, drug discovery, financial modeling, weather forecasting, and many more. As such, the technology term: Quantum Computer points to a future with unprecedented computational capabilities, making it highly significant.

## Explanation

Quantum computers are designed with the purpose of harnessing the peculiar mechanics of quantum physics to process information in ways that classical computers cannot. Existing computers, including supercomputers, operate under what’s called “classical” physics. Quantum computers, on the other hand, perform calculations based on quantum mechanics, which is a set of principles that explain the bizarre, particle-level phenomena that scientists began unraveling in the early 20th century. This variation in the foundational mechanics of operation allows quantum computers to handle much more complex computations at a faster rate.Several fields stand to benefit significantly from this unprecedented computational capability. In cryptography, quantum computers could potentially crack codes and encryption impossible for classical computers, thus necessaritating a whole new level of cyber security. Similarly, they could revolutionize fields like drug discovery by simulating the unique quantum properties of molecules, a task classical computers struggle with. In financial modeling, they could find new ways to model financial data and isolate key global risk factors more efficiently. Lastly, in artificial intelligence, quantum computing could enhance machine learning capabilities by facilitating faster and more complex model training.

## Examples

1. **Google’s Quantum Computer (Sycamore):** In 2019, Google announced it had achieved “quantum supremacy” with their quantum computer called Sycamore. This 53-qubit machine performed a calculation in 200 seconds, which Google claimed would take the world’s fastest supercomputer 10,000 years to complete.2. **IBM Quantum Computing:** IBM has been at the forefront of quantum computing for years. They’ve created several quantum computers and have made them accessible to the public through their “IBM Q Experience,” an online platform that allows registered users to run algorithms and experiments on IBM’s quantum processors. In 2021, IBM unveiled its Eagle quantum computer, a 127-qubit system, the company’s largest as of yet.3. **D-Wave Systems:** D-Wave Systems is a quantum computing company, based in Canada. They’ve commercialized quantum computers and made them accessible to businesses and research institutions. In 2020, D-Wave introduced the Advantage quantum computer which consists of over 5000 qubits. It’s designed to enable developers to embed quantum computing power into existing workflows to tackle complex problems such as logistics optimization, drug discovery, and predictive modeling.

## Frequently Asked Questions(FAQ)

**Q1: What is a Quantum Computer?**A1: A Quantum Computer is a type of computer that uses the principles of quantum mechanics to process data. It operates using the unique phenomena of quantum physics like superposition and entanglement, enabling it to work on millions of computations simultaneously. **Q2: How is a Quantum Computer different from a Classical Computer?**A2: Classical computers use bits as their most basic unit of data, which is either a 0 or a 1. On the other hand, quantum computers use quantum bits, known as qubits, which can be both 0 and 1 at the same time thanks to the principle of superposition. This allows quantum computers to process information much faster and perform complex calculations that are beyond the capacity of classical computers.**Q3: What is a Qubit?** A3: A qubit, or quantum bit, is the basic unit of information in quantum computing. Unlike a standard bit, which can be either 0 or 1, a qubit can be both at the same time due to the quantum concept of superposition.**Q4: What is Quantum Supremacy?** A4: Quantum supremacy or quantum advantage refers to the point where a quantum computer can perform a calculation that would be prohibitively difficult or impossible for a classical computer to solve within a reasonable timeframe. **Q5: What are the potential applications of Quantum Computing?**A5: Some potential applications include drug discovery, material science, financial modeling, climate modeling, cryptography, and even enhancing artificial intelligence algorithms. Essentially, any complex problem that requires the processing of vast amounts of data could potentially benefit from quantum computing.**Q6: What are the challenges in developing Quantum Computers?**A6: While the potential of quantum computing is vast, it comes with unique challenges including quantum decoherence, error correction, and the current need for extremely low temperatures. Additionally, programming quantum computers is challenging as it requires a fundamental rethinking of algorithm design.**Q7: Are Quantum Computers available now?** A7: Some tech companies like IBM, Google, and Microsoft have developed primitive quantum computers and are allowing certain members of the public to access them over the internet for research and learning purposes. However, a universally accessible and fully functional quantum computer for everyday use is still a goal for the future.**Q8: How can one learn more about quantum computing?**A8: There are numerous online resources, courses and tutorials available for free from reputable institutions such as MIT and Stanford University. Several tech companies, including IBM and Google, also offer resources to help people understand and experiment with quantum computing.

## Related Tech Terms

- Superposition
- Qubits
- Quantum Entanglement
- Quantum Decoherence
- Quantum Gate