摘要：Quantum entanglement
plays crucial roles in quantum information
processing. Quantum entangled states have become
the key ingredient in the rapidly expanding
field of quantum information science. Although
the nonclassical nature of entanglement has been
recognized for many years, considerable efforts
have been taken to understand and characterize
its properties recently. In this review, we
introduce some recent results in the theory of
quantum entanglement. In particular separability
criteria based on the Bloch representation,
covariance matrix, normal form and entanglement
witness, lower bounds, subadditivity property of
concurrence and tangle, fully entangled fraction
related to the optimal fidelity of quantum
teleportation, and entanglement distillation will
be discussed in detail.
