S. Weinberg, Lectures

PRINCIPLES OF QUANTUM MECHANICS 24 lectures, Michaelmas Term

*IB Quantum Mechanics is essential*.

**Dirac Formalism**

Bra and ket notation, operators and observables, probability amplitudes, expectation values, complete commuting sets of operators, unitary operators. Schr¨odinger equation, wave functions in position and momentum space. [3]

Time evolution operator, Schroedinger and Heisenberg pictures, Heisenberg equations of motion. [2]

**Harmonic Oscillator **

Analysis using annihilation, creation and number operators. Significance for normal modes in physical examples. [2]

**Translations and Rotations**

Unitary operators corresponding to spatial translations, momenta as generators, conservation of momentum and translational invariance. Corresponding discussion for rotations. Reflections, parity, intrinsic parity. [3]

**Angular Momentum**

Analysis of states |jm> from commutation relations. Addition of angular momenta, calculation of

Clebsch–Gordan coefficients. Spin, Pauli matrices, singlet and triplet combinations for two spin half

states. [4]

**Multi-Particle Systems**

Composite systems and tensor products, wave functions for multiparticle systems. Symmetry or antisymmetry of states for identical particles, Bose and Fermi statistics, Pauli exclusion principle. [3]

**Perturbation Theory **

Time-independent theory; second order without degeneracy, first order with degeneracy. [2]

**Time-Dependent Perturbation Theory**

Interaction picture. First-order transition probability, the golden rule for transition rates. Application

to atomic transitions, selection rules based on angular momentum and parity, absorption, stimulated

and spontaneous emission of photons. [3]

**Quantum Basics**

Quantum data, qubits, no cloning theorem. Entanglement, pure and mixed states, density matrix.

Classical determinism versus quantum probability, Bell inequality for singlet two-electron state, GHZ

state. [2]

**Appropriate books**

S. Weinberg Lectures on Quantum Mechanics CUP 2013

† E. Merzbacher Quantum Mechanics, 3rd edition. Wiley 1998

† B.H. Bransden and C.J. Joachain Quantum Mechanics, 2nd edition. Pearson

J. Binney and D. Skinner The Physics of Quantum Mechanics. OUP

P.A.M. Dirac The Principles of Quantum Mechanics. Oxford University Press 1967, reprinted 2003

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