  Electrons have three quantized properties -- charge, spin, and Fermi
statistics -- that are directly responsible for a vast array of phenomena. Here
we show how these properties can be coherently and dynamically stripped from
the electron as it enters certain exotic states of matter known as a quantum
spin liquid (QSL). In a QSL, electron spins collectively form a highly
entangled quantum state that gives rise to emergent gauge forces and
fractionalization of spin, charge, and statistics. We show that certain QSLs
host distinct, topologically robust boundary types, some of which allow the
electron to coherently enter the QSL as a fractionalized quasiparticle, leaving
its spin, charge, or statistics behind. We use these ideas to propose a number
of universal, conclusive experimental signatures that would establish
fractionalization in QSLs.
