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Q: Quantenoptik und Photonik

Q 67: Quanteninformation IV

Q 67.4: Vortrag

Mittwoch, 9. März 2005, 11:45–12:00, HU 2002

Controlling Spontaneous Emission Rate in Solid State for Quantum Information Science — •Dirk Englund, David Fattal, Edo Waks, and Jelena Vuckovic — Ginzton Laboratory, Stanford University, Stanford, CA 94305

Spontaneous emission depends not only on a light emitter, but also on its electromagnetic environment. Employing two-dimensional photonic crystals (PC’s) to modify the density of electromagnetic states near InGaAs quantum dots (QD’s), we can thus change their radiative properties. When coupled to a PC resonance cavity, we observe a strong reduction of the radiative lifetime and, in some instances, large coupling strength between a single cavity mode and a single QD exciton. These results pave the way to well-known cavity Quantum Electrodynamics (QED) applications such as coherent single photon sources and coherent manipulation of QD-photon systems. In contrast, when the emission is not coupled to the cavity but still inside the PC bandgap, we observe a strong suppression of spontaneous emission, leading in some cases to a ten-fold increase of exciton-lifetime. This effect could be exploited for quantum memory. Remarkably, we find close agreement between these observations and classical Finite-Difference Time Domain (FDTD) simulations.