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๐Ÿ“š Introduction to Quantum Computing


๐Ÿ’ก Newskategorie: Programmierung
๐Ÿ”— Quelle: dev.to

Quantum Computer is a branch of computer science that employs the concepts of quantum theory to execute complicated calculations more effectively than classical computers (like our laptops and phones). They do computations using the strange properties of quantum mechanics that control very small particles like photons and electrons. The goal is to perform certain tasks like optimization, simulation, and cryptography much faster than normal computers allow.

Regular computers use bits, which can be either 1 or 0. But in quantum computing, the basic unit of information is called a qubit, which can be 1 and 0 at the same time!

For example, a quantum algorithm could help find the best path for a delivery driver to take through multiple towns using superposition to try all route options at once. The quantum computer produces a final answer by measuring the qubit, causing it to pick just 0 or 1.

4 principles of Qubits:

Superpostion
Qubits can exist in a superposition of 0 and 1 states at the same time prior to measurement. This allows them to store much more information than binary bits.

For example, a basketball can only be in your hands or on the floor, not both places at once. But in quantum mechanics, tiny objects like electrons can be in different states or places at the same time. This is called superposition. It's like having a basketball that's both in your hands and on the floor at the exact same time!

Interference
The quantum states that a qubit can live in can constructively or destructively interact with each other, increasing or canceling out states. This is like waves colliding and is what allows qubits to explore multiple answers at once when running algorithms. For example, It's like if throwing multiple basketballs at a hoop could make the balls either more likely or less likely to go in, based on how the different basketball routes interact.

Entanglement
When quantum particles interact, they become linked so that what happens to one particle affects the other, even if they are very far apart. It's like having two basketballs that always spin in perfect opposite directions - if you see one spinning clockwise, you know the other far away basketball is spinning counterclockwise. This link between quantum particles is kept even over long distances.

Measurement
In quantum mechanics, the act of measurement forces particles to pick specific states, breaking superpositions. This causes qubits to make precise classical values that we can understand. It's like how opening the box to look at Schrodinger's cat forces it to be either dead or alive. Similarly, measuring a quantum particle's position forces it to pick a definite position, even if before measuring it was in multiple states at once. This process takes data from qubits to complete algorithms.

So, quantum mechanics allows for strange behaviors not seen in our everyday world. Quantum computing taps into these traits to make powerful calculations in new ways not possible with regular computers.

Core Concepts:

  • Qubit - The basic unit of information in a quantum computer. Analogous to a classical bit, but can exist in a superposition of 0 and 1.
  • Quantum Gates - Operations that manipulate qubits. They are the basic logic gates, analogous to AND, OR, NOT gates in classical computing.
  • Quantum Circuits - A series of interconnected quantum gates that perform a computation on the qubits. The quantum equivalent of classical circuits or programs.
  • Quantum Algorithms - Step-by-step procedures to solve a problem on a quantum computer. Algorithms like Shor's and Grover's take advantage of quantum principles to gain speedups over classical algorithms.
  • *Quantum Protocols *- Procedures that use quantum effects like entanglement to enable secure communication. For example, quantum key distribution protocols for cryptography.
  • *Quantum Hardware *- The physical implementation of quantum computers, including the qubits and infrastructure to manipulate them. Current hardware includes superconducting qubits, ion traps, and photonics.
  • Quantum Error Correction - Techniques to detect and account for errors in noisy quantum systems to make reliable, scalable quantum computers.

Future of Quantum Computing:

  • Google's Quantum AI team has developed Circ, a quantum programming language. They are a major player in quantum computing research and development.
  • Microsoft, IBM, Intel, AWS, Honeywell, and other big tech companies also have major quantum computing programs and are racing to build functional quantum computers.
  • Banks like Goldman Sachs, JP Morgan, and Barclays are collaborating with quantum startups to explore using quantum computing for risk analysis, trading, and portfolio optimization.
  • Aerospace companies like Airbus, Lockheed Martin, and Boeing are partnering with quantum companies to apply quantum computing to complex aerodynamic simulations and aircraft design challenges.
  • Biotech and pharmaceutical companies are considering using quantum computing to speed up drug discovery and molecular simulations.
  • Volkswagen and Daimler are working on using quantum computers for optimizing traffic flow and developing new battery materials for electric vehicles.
  • The UK, EU, China, and other countries have major quantum computing research initiatives and are investing heavily in developing quantum technologies.

So, in summary big companies across many industries as well as governments worldwide see the potential for quantum computing and are actively collaborating to turn this potential into reality in the coming years.

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