Quantum Interference Induced Photon Blockade in a Coupled Single Quantum Dot-Cavity System

摘要

We propose an experimental scheme to implement a strong photon blockade witha single quantum dot coupled to a nanocavity. The photon blockade effect can betremendously enhanced by driving the cavity and the quantum dot simultaneouslywith two classical laser fields. This enhancement of photon blockade isascribed to the quantum interference effect to avoid two-photon excitation ofthe cavity field. Comparing with Jaynes-Cummings model, the second-ordercorrelation function at zero time delay $g^{(2)}(0)$ in our scheme can bereduced by two orders of magnitude and the system sustains a large intracavityphoton number. A red (blue) cavity-light detuning asymmetry for photon quantumstatistics with bunching or antibunching characteristics is also observed. Thephoton blockade effect has a controllable flexibility by tuning the relativephase between the two pumping laser fields and the Rabi coupling strengthbetween the quantum dot and the pumping field. Moreover, the photon blockadescheme based on quantum interference mechanism does not require a strongcoupling strength between the cavity and the quantum dot, even with the puredephasing of the system. This simple proposal provides an effective way forpotential applications in solid state quantum computation and quantuminformation processing.