Physical meaning of the Wavefunction Postulate 1: The wavefunction attempts to describe a quantum me-chanical entity (photon, electron, x-ray, etc.) The postulates of quantum mechanics do pass this test. Postulate 1 • All information that can be obtained about the state of a mechanical system is contained in a wave function Ψ, which is a continuous, finite, and single-valued function of time and of the coordinates of the particles of the system Here, the wave function is a quantity that has all the information about the particle at an instant. These postulates can’t be derived, they result from experiment. • Ψ( x, y ,z ,t ) replaces theand fully Quantum Mechanics-Postulates of Quantum Mechanics: Questions 1-5 of 6. Quantum Computing Lecture 3 Postulates of Quantum Mechanics Maris Ozols What is quantum mechanics? 2. Postulates of Quantum Mechanics Postulate 1 •The “Wave Function”, Ψ( x, y ,z ,t ), fully characterizes a quantum mechanical particle including it’s position, movement and temporal properties. the function Ψ 1 may represent the system in state 1 while Ψ 2 represent it in state The energy of the system in state 1 would then be called E 1 and that in state 2 would be E 2 . Postulates of Quantum Mechanics [Last revised: Tuesday 14th January, 2020, 18:58] 24 States and physical systems • In the previous chapter, with the help of the Stern-Gerlach experiment, we have shown the failure of Classical Mechanics and the need to introduce a new theory The postulates are in turn based on a wide range of experimental observations. Quantum Mechanics is an axiomatic theory because it is well-grounded on few principles (from the Latin principium ), or axioms (from the Greek, axios ), or postulates (from the Latin postulatum ), all of these words meaning the same thing: a truth which 3. The formalism of quantum mechanics is based on a number of postulates. Get to the point GATE (Graduate Aptitude Test in Engineering) Physics questions for your exams. through its spatial location and Quantum mechanicsis a branch of physics that describes the behaviour of systems, such as atoms and photons, whose They e.g. In quantum mechanics we seldom deal with position variable and rather deal with the wave function. Quantum Mechanics: Postulates 5th April 2010 I. 5.61 Fall 2007 Lecture #10 page 1 THE POSTULATES OF QUANTUM MECHANICS (time-independent) Postulate 1: The state of a system is completely described by a wavefunction ψ (r,t)Postulate 2: All measurable quantities (observables) are described by

2020 postulates of quantum mechanics