Quantum Computing Made Easy

Want to learn Quantum Computing but dont know where to start? Here you can learn the fundamentals without the unnecessary terminology

Quantum Basics

What is quantum computing?

A new way of designing computers that use the properties of quantum physics to solve problems in a way that is better than classical computers

What is different

Classical computers use bits, either 0 or 1. Whereas quantum computers use qubits, which can be both 0 and 1 simultaneously (further explained in Superposition). This allows quantum computers to solve problems faster than classical computers.

Quantum States

What is a quantum state?

A quantum state represents the position or location of a qubit. Unlike classical bits, qubits can exist in multiple states at once. However, once measured, a qubit has a single state, either 0 or 1.

Bloch Sphere

The Bloch sphere is a three-dimensional representation of the possible states of a qubit. Each point on the sphere's surface represents a different quantum state. At the poles lie the 0 (|0>) and 1 (|1>) states. Along the x axis likes the Plus (|+>) and Minus (|->)state

Ket Notation

Ket Notation is a common way to represent quantum states

  • The 0 state (|0>)
  • The 1 state (|1>)
  • The Plus state (|+>)
  • The Minus state (|->)
bloch sphere 1 bloch sphere 2

Quantum Properties

Superposition

Quantum Superposition states that until a qubit is measured, it can exist in a superposition of both 0 and 1 states simultaneously, meaning it has a probability of being in both states at once.

Interference

Quantum interference occurs when two or more quantum states combine and interfere with each other, resulting in either constructive or destructive interference.

Entanglement

Quantum entanglement is a phenomenon where two or more particles can become correlated in a way that their quantum states are linked, regardless of the distance between them.

Measurement

Quantum Superposition states that until a qubit is measured, it can exist in a superposition of both 0 and 1 states simultaneously, meaning it has a probability of being in both states at once.

Discreteness

Quantum mechanics predicts that physical quantities can only take on certain discrete values. If a line described the values of classical mechanic, the rungs on a ladder would describe quantum mechanics’ values.

Quantum Properties