抄録
Entangled states and their application in quantum optics are reviewed. First, the entangled states of the position and momentum in the EPR paradox and Bohm's spin version are reviewed. Then, various generation methods of entangled states in optics are described: polarization entanglement, frequency entanglement, and quadruture-phase entanglement. Finally, as their applications, fundamentals of quantum communication and teleportation are explained.
