Figure 1

The preparation of entangled states. Cavities $A$ and $B$, each resonant with the $\mid a⟩-\mid b⟩$ transition, are prepared in an entangled state [Eq. (6)] by passing the two-level atom 1 initially in the excited state $\mid a⟩$ with appropriate passage times through the two cavities. The entangled state given by Eq. (8) is prepared via the passage of the three-level atom 2 through the cavity $A$.Reuse & Permissions

Figure 2

(a) A two-level atom initially in its ground state $\mid b⟩$ passes through the entangled cavities $A$ and $B$. The atom in state $\mid a⟩$ acquires a phase shift while passing between the two cavities. The probability of finding the atom in the excited or ground state exhibits interference fringes. (b) The system is the same as in (a), but a tagging qubit can partially or completely erase the interference fringes via dispersive coupling of a three-level atom with cavity $A$.Reuse & Permissions

Figure 3

Cavities $A$ and $B$ are prepared in an entangled state (1) via passage of atom 1 initially in its excited state. The field inside cavity $C$ is teleported to cavity $B$ by making a Bell-state measurement of $AC$ system. The tagging qubit is atom 2 that interacts with the field in cavity $A$ dispersively.Reuse & Permissions