Phonon Decoherence of Quantum Dots in Photonic Structures Broadening of the Zero-Phonon Line and the Role of Dimensionality
| Autor: | Chris L. Dreeßen, Peter Lodahl, Christian Flindt, Petru Tighineanu, Anders S. Sørensen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Quantum decoherence
Photon Phonon Dephasing FOS: Physical sciences Physics::Optics General Physics and Astronomy 02 engineering and technology 01 natural sciences Quantum mechanics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 010306 general physics Scaling Physics Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics ta114 Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Quantum dot Microscopic theory Quantum Physics (quant-ph) 0210 nano-technology Quantum dissipation Physics - Optics Optics (physics.optics) |
| Zdroj: | Tighineanu, P, Dreessen, C L, Flindt, C, Lodahl, P & Sørensen, A S 2018, ' Phonon Decoherence of Quantum Dots in Photonic Structures : Broadening of the Zero-Phonon Line and the Role of Dimensionality ', Physical Review Letters, vol. 120, no. 25, 257401 . https://doi.org/10.1103/PhysRevLett.120.257401 Physical Review Letters |
| ISSN: | 0031-9007 |
| DOI: | 10.1103/PhysRevLett.120.257401 |
| Popis: | We develop a general microscopic theory describing the phonon decoherence of quantum dots and indistinguishability of the emitted photons in photonic structures. The coherence is found to depend fundamentally on the dimensionality of the structure resulting in vastly different performance for quantum dots embedded in a nano-cavity (0D), waveguide (1D), slab (2D), or bulk medium (3D). In bulk, we find a striking temperature dependence of the dephasing rate scaling as $T^{11}$ implying that phonons are effectively 'frozen out' for $T \lesssim 4 \mathrm{K}$. The phonon density of states is strongly modified in 1D and 2D structures leading to a linear temperature scaling for the dephasing strength. The resulting impact on the photon indistinguishability can be important even at sub-Kelvin temperatures. Our findings provide a comprehensive understanding of the fundamental limits to photon indistinguishability in photonic structures. Comment: 19 pages, 9 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|