Germanium-based quantum emitters towards a time-reordering entanglement scheme with degenerate exciton and biexciton states

Dotti, Nicola; Sarti, Francesco; Bietti, Sergio; Azarov, Alexander; Kuznetsov, A. Yu.; Biccari, Francesco; Vinattieri, A.; Sanguinetti, S.; Abbarchi, Marco; Gurioli, Massimo

doi:10.1103/physrevb.91.205316

Cited by 19 publications

(17 citation statements)

References 119 publications

(238 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, we can also exclude that the observed bands originate from Au plasmon resonance: this resonance is expected at about 2.15 eV for Au films [15,16], at lower energies with respect to the PL emissions of our sample (> 2.3 eV), and indeed a small broad band was observed at about 2.2 eV in our PL near field spectra (not shown). The linear dependence of the spectrally integrated PL intensity of each band on the excitation intensity (not shown) indicates that the radiative recombination arises from excitons [17] in agreement with previous reports [18,19]. The comparison reported in Fig.…”

Section: Resultssupporting

confidence: 91%

Recombination dynamics in CsPbBr_3 nanocrystals: role of surface states

Gabelloni

Biccari

Andreotti

et al. 2017

Opt. Mater. Express

Self Cite

View full text Add to dashboard Cite

We present a detailed experimental investigation of the carrier recombination dynamics in CsPbBr 3 films by means of picosecond time-resolved photoluminescence. Temperaturedependent measurements show that carrier capture and release from the nanocrystals (NCs) surfaces determine the observed increase of the recombination lifetime with the increase of temperature. This result opens the way to probe the surface of the NCs, which is of the utmost relevance for optoelectronic applications, and to eventually give feedback for surface treatments of NCs.

show abstract

Section: Resultssupporting

confidence: 91%

Recombination dynamics in CsPbBr_3 nanocrystals: role of surface states

Gabelloni

Biccari

Andreotti

et al. 2017

Opt. Mater. Express

Self Cite

View full text Add to dashboard Cite

show abstract

“…The fitting parameters result to be α = (1.01 ± 0.14) µW −β and β = (1.14 ± 0.06) complex. It turns out that X is nearly always broader than XX 64 , as we also found in our case.…”

supporting

confidence: 88%

Site‐Controlled Single‐Photon Emitters Fabricated by Near‐Field Illumination

et al. 2018

Self Cite

View full text Add to dashboard Cite

Many of the most advanced applications of semiconductor quantum dots (QDs) in quantum information technology require a fine control of the QDs' position and confinement potential, which cannot be achieved with conventional growth techniques. Here, a novel and versatile approach for the fabrication of site-controlled QDs is presented. Hydrogen incorporation in GaAsN results in the formation of N-2H and N-2H-H complexes, which neutralize all the effects of N on GaAs, including the N-induced large reduction of the bandgap energy. Starting from a fully hydrogenated GaAs/GaAsN:H/GaAs quantum well, the NH bonds located within the light spot generated by a scanning near-field optical microscope tip are broken, thus obtaining site-controlled GaAsN QDs surrounded by a barrier of GaAsN:H (laterally) and GaAs (above and below). By adjusting the laser power density and exposure time, the optical properties of the QDs can be finely controlled and optimized, tuning the quantum confinement energy over more than 100 meV and resulting in the observation of single-photon emission from both the exciton and biexciton recombinations. This novel fabrication technique reaches a position accuracy <100 nm and it can easily be applied to the realization of more complex nanostructures.

show abstract

“…An important feature of QDs is their capability to generate, at low temperature, polarizationentangled photon pairs by using the cascade decay of a biexciton state | ⟩ XX to the crystal ground state | ⟩ 0 through the intermediate bright exciton | ⟩ X states 12 . This makes QDs different from other quantum emitters, such as organic molecules, carbon nanotubes 133 and colour centres (even if dyads can support biexcitons 134 no direct demonstration of entanglement has been so far reported). Another widespread solid-state route to entangled photons are the nonlinear parametric down-converters (PDC) 135 , which are intrinsically based on laser pumping with Poissonian (non-deterministic) photon statistics, even in the limit of low pumping.…”

Section: Elsevier (C)mentioning

confidence: 99%

Droplet epitaxy of semiconductor nanostructures for quantum photonic devices

et al. 2019

Self Cite

View full text Add to dashboard Cite

The long dreamed 'quantum internet' would consist of a network of quantum nodes (solid-state or atomic systems) linked by flying qubits, naturally based on photons, travelling over long distances at the speed of light, with negligible decoherence. A key component is a light source, able to provide single or entangled photon pairs. Among the different platforms, semiconductor quantum dots (QDs) are very attractive, as they can be integrated with other photonic and electronic components in miniaturized chips. In the early 1990s two approaches were developed to synthetize self-assembled epitaxial semiconductor QDs, or 'artificial atoms'-namely, the Stranski-Krastanov (SK) and the droplet epitaxy (DE) methods. Because of its robustness and simplicity, the SK method became the workhorse to achieve several breakthroughs in both fundamental and technological areas. The need for specific emission wavelengths or structural and optical properties has nevertheless motivated further research on the DE method and its more recent development, local droplet etching (LDE), as complementary routes to obtain high-quality semiconductor nanostructures. The recent reports on the generation of highly entangled photon pairs, combined with good photon indistinguishability, suggest that DE and LDE QDs may complement (and sometimes even outperform) conventional SK InGaAs QDs as quantum emitters. We present here a critical survey of the state of the art of DE and LDE, highlighting the advantages and weaknesses, the achievements and challenges that are still open, in view of applications in quantum communication and technology.

show abstract

Germanium-based quantum emitters towards a time-reordering entanglement scheme with degenerate exciton and biexciton states

Cited by 19 publications

References 119 publications

Recombination dynamics in CsPbBr_3 nanocrystals: role of surface states

Recombination dynamics in CsPbBr_3 nanocrystals: role of surface states

Site‐Controlled Single‐Photon Emitters Fabricated by Near‐Field Illumination

Droplet epitaxy of semiconductor nanostructures for quantum photonic devices

Contact Info

Product

Resources

About