Electron–hole symmetry breakings in optical fine structures of single self-assembled quantum dots

Ramírez, Hanz Y.; Lin, Chia Hsien; You, Wen; Huang, Shan Yu; Chang, Wen‐Hao; Lin, Sheng-Di; Cheng, Shun‐Jen

doi:10.1016/j.physe.2009.11.141

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Once the indistinguishability of quantum particles is considered, the exchange part of the electron-hole (e-h) Coulomb interaction, which is spin-dependent, plays an important role by breaking up the degeneracy and producing an energy splitting between the exciton states of different spins [22][23][24][25]. This is illustrated in Figure 1c.…”

Section: Fine Structure Splitting In Quantum Dotsmentioning

confidence: 99%

Effects of the Exciton Fine Structure Splitting on the Entanglement-Based Quantum Key Distribution

Hernández-Borda,

Rojas-Sepúlveda,

Ramírez-Gómez

2023

Condensed Matter

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The reliable transmission of secure keys is one of the essential tasks to be efficiently accomplished by quantum information processing, and the use of entangled particles is a very important tool toward that goal. However, efficient production of maximally entangled states is still a challenge for further progress in quantum computing and quantum communication. In the search for optimal sources of entanglement, quantum dots have emerged as promising candidates, but the presence of dephasing in the generated entangled states raises questions about their real usefulness in large-scale quantum networks. In this work, we evaluate the effects of the exciton fine structure splitting, present in most quantum dot samples, on the fidelity of the BBM92 protocol for quantum key distribution. We find that the protocol’s performance is heavily impacted by such splitting and establish an upper limit for the product between the energy splitting and the exciton lifetime to have a dependable distributed key.

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Section: Fine Structure Splitting In Quantum Dotsmentioning

confidence: 99%

Effects of the Exciton Fine Structure Splitting on the Entanglement-Based Quantum Key Distribution

Hernández-Borda,

Rojas-Sepúlveda,

Ramírez-Gómez

2023

Condensed Matter

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“…The loss of exciton polarization is a particularly undesirable effect of the electron-hole exchange, that mixes states with well-defined angular momentum and destroys the excitonspin coherence, which otherwise would remain almost unaffected during the exciton lifetime [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Composed Effects of Electron-Hole Exchange and Near-Field Interaction in Quantum-Dot-Confined Radiative Dipoles

Díaz-Ramírez,

Huang,

Cheng

et al. 2023

Condensed Matter

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Conservation of polarization is an important requirement for reliable single-photon emitters, which, in turn, are essential building blocks for light-based quantum information processing. In this work, we study the exciton-spin dynamics in a double quantum dot under the combined effects of electron-hole exchange and Förster resonance energy transfer. By means of numerical solutions of the quantum master equation, we simulate the time-dependent spin polarization for two neighboring dots. According to our results, under some conditions, the depolarization caused by the electron-hole exchange may be slowed by the near field-induced interdot energy transfer, suggesting a new mechanism to extend the exciton coherence time. This opens doors to alternative schemes for improved solid-state quantum light sources.

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Electron–hole symmetry breakings in optical fine structures of single self-assembled quantum dots

Cited by 2 publications

References 15 publications

Effects of the Exciton Fine Structure Splitting on the Entanglement-Based Quantum Key Distribution

Effects of the Exciton Fine Structure Splitting on the Entanglement-Based Quantum Key Distribution

Composed Effects of Electron-Hole Exchange and Near-Field Interaction in Quantum-Dot-Confined Radiative Dipoles

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