Abstract
Abstract This chapter discusses how entangled two states are. One obvious way is to consider the distillation procedure, in which the entanglement of any state is quantified by how many fully entangled qubits can be distilled from an entangled state. However, it is not easy to see how to distil singlets out of n copies of a general mixed state. Hence, it is necessary to first see what can be done with pure states. This chapter discusses the distillation of multiple copies of a pure state, analogy between quantum entanglement and the Carnot cycle, properties of entanglement measures, entanglement of pure states, entanglement of mixed states, measures of entanglement derived from relative entropy, relationship between classical information and entanglement, and links between entanglement and thermodynamics.
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