Quantum Mechanics II - SS3 Physics Past Questions and Answers - page 2

Quantum operators are mathematical entities that operate on quantum states to produce new states. These operators represent physical observables such as position, momentum, and energy, and they are represented by Hermitian matrices.

Quantum communication uses the principles of quantum mechanics to secure communications. It has applications in fields such as finance, military, and government communications.

Quantum cryptography is a technique that uses the principles of quantum mechanics to secure communications. Unlike classical cryptography, which can be broken by mathematical algorithms, quantum cryptography is inherently secure.