Quantum Computer

A quantum computer is a computing device that uses the principles of quantum mechanics to process information and solve certain complex problems far faster than classical computers.

Quantum Mechanics

Quantum mechanics is a branch of physics that studies the behaviour of matter and energy at atomic and sub-atomic levels, where classical laws of physics no longer fully apply.

Bits vs Qubits

• Classical computers use bits as the basic unit of information.
  • A bit can exist in only one of two states: 0 or 1.
• Quantum computers use quantum bits (qubits).
  • A qubit is a two-state fundamental unit of quantum computing, but unlike a classical bit, it can exist in both 0 and 1 simultaneously.

This unique property allows quantum computers to process many possibilities at once, significantly increasing computational power.

Key Quantum Principles Used in Qubits

1. Superposition

• Quantum superposition means a qubit can exist as 0 and 1 at the same time.
• This enables a quantum computer to represent and process multiple values simultaneously, making computations faster and more powerful than classical methods.

2. Entanglement

• Quantum entanglement occurs when two or more qubits become linked in such a way that the state of one qubit is directly related to the state of the other, regardless of the distance between them.
• When one entangled qubit is measured, the state of the other is instantly determined.
• Entanglement allows qubits to work in a highly coordinated and unified manner, enabling efficient solutions to complex problems.

Why Quantum Computers Are Powerful

By combining superposition and entanglement, quantum computers can:

• Perform many calculations in parallel
• Solve certain problems exponentially faster than classical computers
• Tackle complex tasks in areas such as cryptography, materials science, drug discovery, and optimization