Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 82: Quantum dots and wires: Cavities and photons

HL 82.2: Talk

Thursday, March 14, 2013, 15:15–15:30, H2

Triggered photon pair emission from semiconductor quantum dots via resonant two-photon absorption — •Markus Müller, Klaus D. Jöns, Samir Bounouar, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

As single-photon emitters with narrow spectral linewidths, semiconductor quantum dots have various application possibilities, e.g., for linear optical quantum computation, quantum communication or quantum information processing. To fully exploit their outstanding properties in a deterministic way, a coherent resonant excitation scheme is required. A two-photon absorption process allows us to coherently populate the biexciton state of a single In(Ga)As/GaAs quantum dot. Setting the energy of the excitation laser pulses between the exciton and biexciton transition will resonantly excite the quantum dot within a two-photon absorption process, without the disadvantage of having the pump and the detection light on the same wavelength. In auto-correlation measurements a full suppression of multi-photon-events is observed, with one of the cleanest single-photon emission reported in semiconductor quantum dots (g²(τ) < 0.02). In addition, this resonant excitation scheme is increasing the coherence time of the emitted light compared to non-resonant excitation processes.