Solid State Quantum Information

Cavity Quantum Electrodynamics with Single Quantum Dots

speaker: Antonio Badolato (ETH Zurich)

abstract: Landmark experiments on atoms in cavities have revealed fundamental aspects of coherence in quantum systems and made Cavity Quantum Electrodynamics (CQED) a central paradigm for the study of open quantum systems. Recent progresses in semiconductor crystal growth and nanofabrication have made possible the realization of CQED systems in the solid state.

In this talk I will focus on three aspects: • The effective atomic behavior of electrons spatially confined in InAsGaAs semiconductor self assembled quantum dots (QDs). • The spatial positioning and spectral tuning between QDs and photonic crystal microcavity slab (PCM) modes. • The demonstration and use of a deterministic coupling between single QDs and single PCM modes.

I will show how the QD exciton fine structure is probed by sequential vacuum Rabi splitting of the multi-excitons and how on resonance, sub-Poissonian statistics of the QD-PCM emitted light validates the quantum nature of the reached strong coupling regime. Off resonance, a remarkable antibunching in cavity-exciton cross-correlation demonstrates that the identification between atoms and QDs can only be a provisional description of the actual QD state of matter.

timetable:
Fri 5 Dec, 15:00 - 15:30, Sala Stemmi
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