Formation dynamics of an entangled photon pair: A temperature-dependent analysis

Carmele, Alexander; Milde, Frank; Dachner, Matthias‐René; Harouni, M. Bagheri; Roknizadeh, R.; Richter, Marten; Knorr, Andreas

doi:10.1103/physrevb.81.195319

Cited by 35 publications

(29 citation statements)

References 72 publications

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“…The biexciton binding energy is E B XX and the exciton levels are split by a fine-structure splitting δ. The Hamiltonian of this system is given by [26] …”

Section: A Quantum-dot Cavity Systemmentioning

confidence: 99%

Polarization-entangled twin photons from two-photon quantum-dot emission

2017

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Semiconductor quantum dots are promising sources for polarization-entangled photons. As an alternative to the usual cascaded biexciton-exciton emission, direct two-photon emission from the biexciton can be used. With a high-quality optical resonator tuned to half the biexciton energy, a large proportion of the photons can be steered into the two-photon emission channel. In this case the degree of polarization entanglement is inherently insensitive to the exciton fine-structure splitting.In the present work we analyze the biexciton emission with particular emphasis on the influence of coupling of the quantum-dot cavity system to its environment. Especially for a high-quality cavity, the coupling to the surrounding semiconductor material can open up additional phonon-assisted decay channels. Our analysis demonstrates that with the cavity tuned to half the biexciton energy, the potentially detrimental influence of the phonons on the polarization entanglement is strongly suppressed-high degrees of entanglement can still be achieved. We further discuss spectral properties and statistics of the emitted twin photons.

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“…The biexciton binding energy is E B XX and the exciton levels are split by a fine-structure splitting δ. The Hamiltonian of this system is given by [26] …”

Section: A Quantum-dot Cavity Systemmentioning

confidence: 99%

Polarization-entangled twin photons from two-photon quantum-dot emission

2017

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“…During growth, particular care is taken to monitor unintentional impurity levels. [9][10][11] The QDs are self-formed at the bottom of the inverted pyramids during deposition of the In 0.15 Ga 0.85 As layer due to capillarity effects and decomposition-rate anisotropy. 12,13 Before and after growth of the QD layer, an Al 30 Ga 70 As barrier layer was grown (see the inset of Fig.…”

Section: Samplementioning

confidence: 99%

Quantum dot asymmetry and the nature of excited hole states probed by the doubly positively charged excitonX2+

et al. 2013

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In this experimental and theoretical study, it was found that the emission pattern of the doubly positively charged exciton complex X 2+ strongly depends on the nature of the involved excited hole states as well as the quantum dot symmetry. The two-hole system in the final state of the X 2+ recombination for the investigated high-symmetry pyramidal InGaAs quantum dots does not exhibit the singlet-tripletlike arrangement previously observed for the two-electron counterpart. Instead, the final states exhibit two true doublets, in accordance with group-theoretical predictions. Asymmetry is manifested in the photoluminescence spectra of X 2+ by a significant splitting of one doublet, which is a spectral feature exhibited to some degree by all of the measured quantum dots. The analysis demonstrates that an external magnetic field elevates the symmetry of the quantum dots. This work highlights the exciton complex X 2+ as a very sensitive probe of the quantum dot shape as well as the nature of the involved quantum states. Thus, its spectral features are very suitable for an efficient uninvasive postgrowth symmetry characterization of quantum dots.

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“…Although relaxed, they still can interact with the WL via multi-photon processes. [66][67][68] Using this mechanism, we investigate the biexciton cascade and formation of entangled photons from a single QD.…”

Section: Description Of the Hybrid Systemmentioning

confidence: 99%

Highly entangled photon pairs generated from the biexciton cascade transition in a quantum-dot–metal-nanoparticle hybrid system

2017

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The entanglement between photon pairs generated from the biexciton cascade transition in a semiconductor quantum dot located in the vicinity of a metal nanoparticle is theoretically investigated. In the model scheme, the biexciton-exciton and exciton-ground state transitions are assumed to be coupled to two principal plasmon modes of orthogonal polarizations. For a broad spectral window, because the horizontal and vertical spectra are overlapped, the biexciton and exciton photons are degenerate in energy. This allows us to overcome the natural splitting between the intermediate exciton states. Moreover, the degree of entanglement depends on the geometrical parameters of the system. i.e., the radius of the metal nanoparticle and the distance between the quantum dot and the nanoparticle. The results reveal that such a hybrid system profoundly modifies the photon entanglement even in the absence of strong coupling between the emitter and the metal nanosphere.

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Formation dynamics of an entangled photon pair: A temperature-dependent analysis

Cited by 35 publications

References 72 publications

Polarization-entangled twin photons from two-photon quantum-dot emission

Polarization-entangled twin photons from two-photon quantum-dot emission

Quantum dot asymmetry and the nature of excited hole states probed by the doubly positively charged excitonX2+

Highly entangled photon pairs generated from the biexciton cascade transition in a quantum-dot–metal-nanoparticle hybrid system

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