In holographic CFTs, the Bures information metric of locally excited reduced density matrices vanishes outside the entanglement wedge and matches the AdS time-slice metric inside, giving a CFT-side derivation of wedge geometry.
Entanglement Wedges from Information Metric in Conformal Field Theories
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abstract
We present a new method of deriving the geometry of entanglement wedges in holography directly from conformal field theories (CFTs). We analyze an information metric called the Bures metric of reduced density matrices for locally excited states. This measures distinguishability of states with different points excited. For a subsystem given by an interval, we precisely reproduce the expected entanglement wedge for two dimensional holographic CFTs from the Bures metric, which turns out to be proportional to the AdS metric on a time slice. On the other hand, for free scalar CFTs, we do not find any sharp structures like entanglement wedges. When a subsystem consists of disconnected two intervals we manage to reproduce the expected entanglement wedge from holographic CFTs with correct phase transitions, up to a very small error, from a quantity alternative to the Bures metric.
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Entanglement Wedges from Information Metric in Conformal Field Theories
In holographic CFTs, the Bures information metric of locally excited reduced density matrices vanishes outside the entanglement wedge and matches the AdS time-slice metric inside, giving a CFT-side derivation of wedge geometry.