On the transfer of states in coupled systems

Exchange of quantum states between coupled oscillators

“…As final remarks we mention that exchange of states and its efficiency could be investigated for other model-Hamiltonians and, as explained before, the effect goes beyond those studied in [16] and [17]. To our knowledge, exchange of states in coupled systems and even exchange of certain properties, are subjects receiving little attention in the literature [23] -with the remarkable exception of quantum teleportation [21], an effect having a very distinct nature (requiring the presence of quantum channels and entangled states), which occurs in the absence of coupling between the two sub-systems.…”

“…We show in which way one can get exact exchange of the states between two interacting sub-systems. Exchange of states means simultaneous transfer of states in two opposite directions; so, it is more significant than the transfer of states in one direction as studied in [17]. In the present case the transfer of a state from the "easy-oscillator" to the "hard-oscillator " is observed by simply monitoring the state of the easy-oscillator during the time evolution of the whole system.…”

“…[16] we have studied the transfer of certain properties (statistics and squeezing) and in Ref. [17] we have studied the transfer of the most relevant part of the state of a sub-system to another, through the simultaneous transfer of the number and phase distributions, P n and P (θ) 1 [17]; the solutions were found numerically since the models were not exactly soluble.…”

Effect of dissipation and reservoir temperature on squeezing exchange and emergence of entanglement between two coupled bosonic modes

“…Eqs. (25) and (30) suggest that the squeezing parameters r 1 and r 2 must be also big (at least one of them), in order to make the modes entangled (because the presence of damping can only deteriorate the possibility of entanglement, and not to make it more easy).…”