4 papers
Spacetime Density Matrix: Formalism and Properties
Wu-zhong Guo
In this paper, we develop the general formalism and properties of the spacetime density matrix, which captures correlations among different Cauchy surfaces and can be regarded as a…
Measuring the Black Hole Interior from the Exterior
Wu-zhong Guo
In this essay, we argue that an observer outside the horizon can reconstruct the geometry of a black hole's interior through external measurements. This procedure builds on recent…
Quantum Entanglement Autodistillation in Baryon Pair Decays
Hai-Long Feng, Hao Tang, Wu-zhong Guo +1
We study the spin-entangled mixed state of a spin-1/2 baryon-antibaryon pair produced in the process e+e- to J/psi, psi(2S) to BBbar. We demonstrate that the spin entanglement of t…
Spectral Projections for Density Matrices in Quantum Field Theories
Wu-zhong Guo
In this paper, we investigate the spectral projection of density matrices in quantum field theory. With appropriate regularization, the spectral projectors of density matrices are…