Speaker
Description
The idea of holographic duality in string theory provides a simple
geometric computation of entanglement entropy. This generalizes the celebrated
Bekenstein-Hawking formula of black hole entropy and strongly suggests that a
gravitational spacetime consists of many qubits with quantum entanglement.
Recently, a new extension of entanglement entropy, called pseudo entropy,
which depends on both an initial and a final state, was introduced. This
quantity turned out to have a clear geometric dual via the holography and also
plays a role of a new order parameter of quantum phases. In this talk, after
reviewing the above mentioned developments, we would like to point out that
pseudo entropy becomes a useful probe in traversable wormhole geometries,
where non-hermitian density matrices naturally appear in their CFT duals.
