  Quantum steering describes the ability of one observer to nonlocally affect
the other observer's state through local measurements, which represents a new
form of quantum nonlocal correlation and has potential applications in quantum
information and quantum communication. In this paper, we propose a computable
steering criterion that is applicable to bipartite quantum systems of arbitrary
dimensions. The criterion can be used to verify a wide range of steerable
states directly from a given density matrix without constructing measurement
settings. Compared with the existing steering criteria, it is readily
computable and testable in experiment, which can also be used to verify
entanglement as all steerable quantum states are entangled.
