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Connecting Fisher information to bulk entanglement in holography

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arxiv 1701.02319 v3 pith:4O2HCBVI submitted 2017-01-09 hep-th gr-qcquant-ph

Connecting Fisher information to bulk entanglement in holography

classification hep-th gr-qcquant-ph
keywords informationquantumboundaryfishercorrectionentanglementholographicmetric
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In the context of relating AdS/CFT to quantum information theory, we propose a holographic dual of Fisher information metric for mixed states in the boundary field theory. This amounts to a holographic measure for the distance between two mixed quantum states. For a spherical subregion in the boundary we show that this is related to a particularly regularized volume enclosed by the Ryu-Takayanagi surface. We further argue that the quantum correction to the proposed Fisher information metric is related to the quantum correction to the boundary entanglement entropy. We discuss consequences of this connection.

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