Quantum exciton-polariton networks through inverse four-wave mixing

Abstract

We demonstrate the potential of quantum operation using lattices of exciton-polaritons in patterned semiconductor microcavities. By introducing an inverse four-wave mixing scheme acting on localized modes, we show that it is possible to develop non-classical correlations between individual condensates. This allows a concept of quantum exciton-polariton networks, characterized by the appearance of multimode entanglement even in the presence of realistic levels of dissipation.

Boosting entanglement between exciton-polaritons with on-off switching of Josephson coupling

“…In the present work, we provide analytical and numerical evidence that the entanglement generated with the procedure introduced in Ref. [22] can be substantially enhanced with the appropriate on-off switching of Josephson coupling between the cavities, exploiting thus the full capacity of the method. Since the model of two nonlinear interacting bosons is encountered in a wide spectrum of physical settings, we expect that the suggested methodology is not restricted only to exciton-polariton systems in semiconductor microcavities but can also find application in other contexts.…”

“…Model.-We consider a pair of coupled cavities as in [22], which can be implemented with the techniques of [23], described by the Hamiltonian…”

“…Constant Josephson coupling.-The authors of Ref. [22] consider the situation where a constant coupling J (t) = J T , with α < J T ≤ J, is applied for the whole time interval 0 ≤ t ≤ T . The appropriate value of the coupling depends on T , as it is denoted by the subscript in J T .…”

“…Effect of dissipation.-We consider the simple dissipation model of Ref. [22], where each second order correlation dissipates at a rate Γ. The system equations are modified asṠ…”

Efficient entanglement generation between exciton-polaritons using shortcuts to adiabaticity

“…The authors of Ref. [14] studied the system dynamics with a constant enhanced nonlinearity α. Here, we consider that the classical field amplitudes a L , a U can be varied with time, allowing for a timedependent α(t).…”