Key for a Hidden Quantum State

Storing quantum information in a generalised Dicke model via a simple rotation

“…As expected, the population of the atomic level ω 1 is close to unity in the normal region (close to the origin), while for the collective region this decreases to ⟨A 11 ⟩ ≈ 0.5, indicating that in this region the other atomic levels contribute an important role to the ground state. The figure also shows the corresponding atomic populations for the transformed Hamiltonians equations ( 9) and (10), respectively; while the atomic population of level ω 1 remains unaltered, those of the higher atomic levels change drastically; in particular, we note that the higher atomic level populations exchange their role under these rotations.…”

“…Recently [10] the evolution of an open cavity mode has been considered, allowing the proposal of a protocol which allows to infer the Fock state of the system. Through quantum nondemolition measurements, a realisation of a positive operator-valued measure that leaves the system in an eigenstate of the measured observable has been attained [11].…”

Classical Emulation of Bright Quantum States

“…[ 65 ] The Jaynes‐Cummings model gave rise to a plethora of important theoretical predictions and experimental observations, such as, for example, Rabi splitting, [ 66–68 ] antibunching and sub‐Poissonian statistics of the intra‐cavity field, [ 69,70 ] phase and amplitude bistability; [ 71,72 ] a variable source for conditional and unconditional generation of non‐classical states. [ 73–77 ]…”