Quantum states of light This book explains what quantum states of light look like. Of special interest a single photon state is explained by using a wave picture showing that it corresponds to the complementarity of a quantum. Also explained is how light waves are created by photons again corresponding to the complementarity of a quantum. The author shows how an optical wave is created by superposition of a vacuum and a single photon as a typical example. Moreover squeezed states of light are explained as longitudinal waves of light and Schrödingers cat states as macroscopic superposition states. 1. Quantum states of light 1 1 Quantum optics 1 2 Coherent states 1 3 Balanced homodyne measurements 1 4 Single photon state 1 5 Fock states 1 6 Super position of a vacuum and a single photon 1 7 Coherent states and Schrodingers cat states 1 8 Wigner function 1 9 Super position of a vacuum and a two photon state 1 10 Squeezed states 1 11 Squeezing operation 1 12 Quantum entanglement 2. Generation of quantum states of light 2 1 Generation of coherent states 2 2 Generation of squeezed states 2 3 Generation of a single photon state 2 4 Generation of Schrodingers cat states 2 5 Generation of superposition of Fock states 2 6 Generation of quantum entanglement 3. Quantum operations for quantum states of light 3 1 Various quantum operations 3 2 Quantum teleportation 3 3 Quantum gate teleportation