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Entanglement creation in a quantum-dot-nanocavity system by Fourier-synthesized acoustic pulses

AuthorsBlattmann, Ralf; Krenner, Hubert J.; Kohler, Sigmund ; Hänggi, Peter
Issue Date2014
PublisherAmerican Physical Society
CitationPhysical Review A 89: 012327 (2014)
AbstractWe explore the possibility of entangling an excitonic two-level system in a semiconductor quantum dot with a cavity defined on a photonic crystal by sweeping the cavity frequency across its resonance with the exciton transition. The dynamic cavity detuning is established by a radio frequency surface acoustic wave (SAW). It induces Landau-Zener transitions between the excitonic and the photonic degrees of freedom and thereby creates a superposition state. We optimize this scheme by using tailored Fourier-synthesized SAW pulses with up to five harmonics. The theoretical study is performed with a master equation approach for present state-of-the-art setups. Assuming experimentally demonstrated system parameters, we show that the composed pulses increase both the maximum entanglement and its persistence. The latter is only limited by the dominant dephasing mechanism, i.e., the photon loss from the cavity. © 2014 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevA.89.012327
Identifiersdoi: 10.1103/PhysRevA.89.012327
issn: 1050-2947
e-issn: 1094-1622
Appears in Collections:(ICMM) Artículos
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