Entanglement of Quantum Dot States and Correlation Properties of Cavity Photons Emitted by Coupled Quantum Dot Qubits

Abstract

We have studied the entanglement of coupled quantum dot qubits via cavity photon correlation. In the case of conservation of total entanglement, we have found that in the strong coupling limit of the cavity quantum dot qubit interactions guided an alternative means of preserving entanglement. In the case of cavity photon and quantum dot excitation dynamics coupled with surface plasmons optically excited by laser pulse. It was found the character of the quantum entanglement formation was different in strong and weak coupling regimes between the photons and quantum dots. It was found that the cavity photons were sensitive to the quantum dot concurrence formation. The effect of the entanglement oscillations between the quantum dot and the cavity photons due to the excitation polariton formation was found. In the time intervals between the peaks, the photons emitted by the entangled quantum dots strongly anti-bunched. This behavior contrasted for unentangled quantum dots enabled direct optical detection of quantum dot qubit entanglement. The correlation exhibited in quantum dot photon cavity system. It was found that the second order correlation function of photon emitted by coupled quantum dot qubits were utilized as a quantum entanglement formation. Various quantum dot coupling methods have been considered including sharing the photon field in an optical microcavity. We have used an alternative system for achieving, detecting and study of entanglement of palsmonically coupled quantum dots in optical microcavities using numerical simulations and theoretical analysis we have presented one to one correspondence between the entanglement of quantum dot states and the correlation properties of cavity photons emitted by the quantum dots. We have shown that the time dependent of both the quantum dot entanglement and the photon correlation functions changed from photon correlation suppressed to strong oscillation during the transition from weak to strong quantum dot cavity photon coupling regimes. The results found were in good agreement with previously obtained results.