Single photon absorption and dynamic control of a coupled quantum dot-cavity system

Abstract

We theoretically investigate the dynamic interaction of a quantum dot in a nanocavity with timesymmetric single photon pulses. The simulations, based on a wavefunction approach, reveal that almost perfect single photon absorption occurs for quantum dot-cavity systems operating on the edge between strong and weak coupling regime. The computed maximum absorptions probability is close to unity for pulses with a typical length comparable to the half of the Rabi period. Furthermore, the dynamic control of the quantum dot energy via electric fields allows the freezing of the light-matter interaction leaving the quantum dot in its excited state. Shaping of single photon wavepackets by the electric field control is limited by the occurrence of chirping of the single photon pulse. This understanding of the interaction of single photon pulses with the quantum dot-cavity system provides the basis for the development of advanced protocols for quantum information processing in the solid state.

7 pages, 4 figures

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• Quantum Computing
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• Generation of ultrashort (~10ps) spontaneous emission pulses by quantum dots in a switched optical microcavity
• Deterministic photon storage and readout in a semimagnetic quantum-dot--cavity system doped with a single Mn ion