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An Introduction To Bra-Ket (Dirac) Notation
Learn about Bra-Ket or Dirac notation, a powerful mathematical tool used to describe Quantum systems.
I have been writing a Quantum Computing publication called Into Quantum, and here is one of the fundamental lessons you need to learn in Quantum mechanics before understanding how Quantum computers work.
This lesson will combine many concepts from the previous lessons on the mathematics required for quantum mechanics and quantum computing.
Here are these lessons, in case you missed them:
- Lesson 1: Imaginary and Complex Numbers
- Lesson 2: Trignometry
- Lesson 3: Differential Calculus
- Lesson 4: Probability
What Is The Bra-Ket Notation?
Paul Dirac created and introduced Bra-ket notation in his 1939 publication A New Notation for Quantum Mechanics.
This notation is an easier and more compact way to express quantum mechanical states and operations.
It consists of:
- Ket ∣ψ⟩ that represents a quantum state
- Bra ⟨ψ∣ that is the complex conjugate transpose of the ket.