scholarly journals PHOTON GENERATION EFFICIENCY AND ENTANGLEMENT IN QUANTUM DOT SYSTEMS

2016 ◽  
Vol 7 (2) ◽  
Author(s):  
Ana Predojević
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Quantum Communication ◽  
Maximum Amplitude ◽  
Communication Technologies ◽  
Energy Structure ◽  
Generation Efficiency ◽  
Two Photon ◽  
Photon Generation ◽  
Excitation Method

The interest in quantum dots as sources of quantum light is based upon the potential for high photon generation efficiency that originates in their atom-like energy structure. Quantum dots can be excited resonantly and coherently, where generation of photon pairs calls for a specific excitation method of two-photon resonant excitation of the biexciton. Though this method is very efficient, it was very often showing sub-unity excitation efficiency that could be observed, for instance, in the maximum amplitude of the Rabi oscillations. Investigation of the dephasing processes in this excitation technique is of strategic interest for quantum communication technologies.

Carbon quantum dot–NO photoreleaser nanohybrids for two-photon phototherapy of hypoxic tumors

2015 ◽  
Vol 51 (1) ◽  
pp. 81-84 ◽  
Author(s):  
Colin Fowley ◽  
Anthony P. McHale ◽  
Bridgeen McCaughan ◽  
Aurore Fraix ◽  
Salvatore Sortino ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Tumor Volume ◽  
Carbon Quantum Dots ◽  
Pancreatic Tumors ◽  
Two Photon ◽  
Carbon Quantum Dot ◽  
Nir Light ◽  
Photon Excitation ◽  
Reduce Tumor Volume

Carbon quantum dots conjugated with a NO photodonor reduce tumor volume in mice bearing human xenograft BXPc-3 pancreatic tumors upon two-photon excitation with NIR light.

Plasmon–exciton interaction strongly increases the efficiency of a quantum dot–based near-infrared photodetector operating in the two-photon absorption mode under normal conditions.

Nanoscale ◽  
2021 ◽  
Author(s):  
Victor A. Krivenkov ◽  
Pavel Samokhvalov ◽  
Ivan Vasil’evskii ◽  
Nikolai Kargin ◽  
Igor Nabiev
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Near Infrared ◽  
Semiconductor Quantum Dots ◽  
Photon Absorption ◽  
Bandgap Energy ◽  
Infrared Photodetector ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Absorption Mode

Semiconductor quantum dots (QDs) are known for their high two-photon absorption (TPA) capacity. This allows them to efficiently absorb infrared photons with energies lower than the bandgap energy. Moreover, TPA...

scholarly journals Quantum dot technology for quantum repeaters: from entangled photon generation towards the integration with quantum memories

2021 ◽  
Author(s):  
Julia Neuwirth ◽  
Francesco Basso Basset ◽  
Michele B. Rota ◽  
Emanuele Roccia ◽  
Christian Schimpf ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Communication ◽  
Special Focus ◽  
Quantum Repeater ◽  
Long Distance ◽  
Quantum Networks ◽  
Pair Generation ◽  
The One ◽  
Photon Generation ◽  
High Degree

Abstract The realization of a functional quantum repeater is one of the major research goals in long-distance quantum communication. Among the different approaches that are being followed, the one relying on quantum memories interfaced with deterministic quantum emitters is considered as one of the most promising solutions. In this work, we focus on the hardware to implement memory-based quantum-repeater schemes that rely on semiconductor quantum dots for the generation of polarization entangled photons. Going through the most relevant figures of merit related to efficiency of the photon source, we select significant developments in fabrication, processing and tuning techniques aimed at combining high degree of entanglement with on-demand pair generation, with a special focus on the progress achieved in the representative case of the GaAs system. We proceed to offer a perspective on integration with quantum memories, both highlighting preliminary works on natural-artificial atomic interfaces and commenting a wide choice of currently available and potentially viable memory solutions in terms of wavelength, bandwidth and noise-requirements. To complete the overview, we also present recent implementations of entanglement-based quantum communication protocols with quantum dots and highlight the next challenges ahead for the implementation of practical quantum networks.

scholarly journals Purcell-Enhanced and Indistinguishable Single-Photon Generation from Quantum Dots Coupled to On-Chip Integrated Ring Resonators

Nano Letters ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 6357-6363 ◽  
Author(s):  
Łukasz Dusanowski ◽  
Dominik Köck ◽  
Eunso Shin ◽  
Soon-Hong Kwon ◽  
Christian Schneider ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Single Photon ◽  
Ring Resonators ◽  
On Chip ◽  
Photon Generation

Single-charge transport through hybrid core–shell Au-ZnS quantum dots: a comprehensive analysis from a modified energy structure

Nanoscale ◽  
2021 ◽  
Author(s):  
Tuhin Shuvra Basu ◽  
Simon Diesch ◽  
Ryoma Hayakawa ◽  
Yutaka Wakayama ◽  
Elke Scheer
Keyword(s):  
Quantum Dots ◽  
Electronic Structure ◽  
Carrier Transport ◽  
Comprehensive Analysis ◽  
Energy Structure ◽  
Core Shell ◽  
Single Charge ◽  
Scanning Tunnelling Microscope ◽  
Single Carrier ◽  
Scanning Tunnelling

We examined the modified electronic structure and single-carrier transport of individual hybrid core–shell metal–semiconductor Au-ZnS quantum dots using a scanning tunnelling microscope.

NiAg-graphene quantum dot-graphene hybrid with high oxidase-like catalytic activity for sensitive colorimetric detection of malathion

2021 ◽  
Author(s):  
Xu Dan ◽  
Ruiyi Li ◽  
Qinsheng Wang ◽  
Yongqiang Yang ◽  
Haiyan Zhu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Quantum Dot ◽  
Colorimetric Detection ◽  
Graphene Quantum Dots ◽  
Functionalized Graphene ◽  
Graphene Quantum Dot ◽  
Nickel Silver

The paper reports the synthesis of nickel-silver-graphene quantum dot-graphene hybrid. Histidine-functionalized graphene quantum dots (His-GQDs) were bonded to graphene oxide (GO) and then combined with Ni2+ and Ag+ to form...

scholarly journals Effect of Growth Temperature on the Characteristics of CsPbI3-Quantum Dots Doped Perovskite Film

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4439
Author(s):  
Shui-Yang Lien ◽  
Yu-Hao Chen ◽  
Wen-Ray Chen ◽  
Chuan-Hsi Liu ◽  
Chien-Jung Huang
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Quantum Dots ◽  
Quantum Dot ◽  
Growth Temperature ◽  
Electron Mobility ◽  
Surface Defects ◽  
Different Temperatures ◽  
Pb Doping ◽  
Pristine Film

In this study, adding CsPbI3 quantum dots to organic perovskite methylamine lead triiodide (CH3NH3PbI3) to form a doped perovskite film filmed by different temperatures was found to effectively reduce the formation of unsaturated metal Pb. Doping a small amount of CsPbI3 quantum dots could enhance thermal stability and improve surface defects. The electron mobility of the doped film was 2.5 times higher than the pristine film. This was a major breakthrough for inorganic quantum dot doped organic perovskite thin films.

scholarly journals Tailoring the Geometry of Bottom-Up Nanowires: Application to High Efficiency Single Photon Sources

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1201
Author(s):  
Dan Dalacu ◽  
Philip J. Poole ◽  
Robin L. Williams
Keyword(s):  
Quantum Dot ◽  
High Efficiency ◽  
Emission Rate ◽  
Single Photon ◽  
Collection Efficiency ◽  
Photon Emission ◽  
Device Performance ◽  
Bottom Up ◽  
Selective Area ◽  
Photon Generation

For nanowire-based sources of non-classical light, the rate at which photons are generated and the ability to efficiently collect them are determined by the nanowire geometry. Using selective-area vapour-liquid-solid epitaxy, we show how it is possible to control the nanowire geometry and tailor it to optimise device performance. High efficiency single photon generation with negligible multi-photon emission is demonstrated using a quantum dot embedded in a nanowire having a geometry tailored to optimise both collection efficiency and emission rate.

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