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Entropy 2011, 13, 1305-1323; doi:10.3390/ OPEN ACCESS entropy ISSN 1099-4300 /journal/entropy Article State Operator Correspondence and Entanglement in AdS2/CFT 1 Ashoke Sen Harish-Chandra Research Institute, Chhatnag Road, Jhusi, Allahabad 211019, India; E-Mail: sen@hri.res.in Received: 13 June 2011 / Accepted: 22 June 2011 / Published: 19 July 2011 Abstract: Since Euclidean global AdS2 space represented as a strip has two boundaries, the state-operator correspondence in the dual CFT1 reduces to the standard map from the operators acting on a single copy of the Hilbert space to states in the tensor product of two copies of the Hilbert space. Using this picture we argue that the corresponding states in the dual string theory living on AdS2 × K are described by the twisted version of the Hartle–Hawking states, the twists being generated by a large unitary group of symmetries that this string theory must possess. This formalism makes natural the dual interpretation of the black hole entropy—as the logarithm of the degeneracy of ground states of the quantum mechanics describing the low energy dynamics of the black hole, and also as an entanglement entropy between the two copies of the same quantum theory living on the two boundaries of global AdS2 separated by the event horizon. Keywords: black hole; statistical entropy; entanglement entropy 1. Introduction and Summary With the help of radial quantization, local operators in a conformal field theory in d