Time Evolution of an Exciton and a Photon Qubit Coupled with Each Other

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We theoretically study the time evolution of an exciton qubit (quantum dot) and a photon qubit (photonic cavity) coupled with each other. Special attention is paid to the effect of pure dephasing and energy dissipation in the quantum dot. We find that the pure dephasing brings about the oscillation of the entropy of the quantum dot with the half period of Rabi oscillation. Finite entanglement remains in the steady state. This state can be used for preparing the Bell state between photon and exciton qubits. The energy dissipation suppresses the amplitude of the oscillation of the entanglement between the exciton and photon qubits. We also find that the energy dissipation in the quantum dot changes the oscillation period of the entropy of the quantum dot.

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