scholarly journals Control of a spin qubit in a lateral GaAs quantum dot based on symmetry of gating potential

2020 ◽  
Vol 101 (16) ◽  
Author(s):  
Pavle Stipsić ◽  
Marko Milivojević
Keyword(s):  
Quantum Dot ◽  
Spin Qubit ◽  
Gaas Quantum Dot

Theoretical study of excitons in GaAs quantum dot molecules obtained by nanoholes filling

2021 ◽  
Vol 124 ◽  
pp. 105614
Author(s):  
S. Tilouche ◽  
A. Sayari ◽  
M. Omri ◽  
S. Souilem ◽  
L. Sfaxi ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Theoretical Study ◽  
Quantum Dot Molecules ◽  
Gaas Quantum Dot

scholarly journals Fundamental limits of electron and nuclear spin qubit lifetimes in an isolated self-assembled quantum dot

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
George Gillard ◽  
Ian M. Griffiths ◽  
Gautham Ragunathan ◽  
Ata Ulhaq ◽  
Callum McEwan ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Spin Relaxation ◽  
Nuclear Spin ◽  
Operating Conditions ◽  
External Control ◽  
Spin Qubits ◽  
Fundamental Limits ◽  
Trade Offs ◽  
Wide Range ◽  
Spin Qubit

AbstractCombining external control with long spin lifetime and coherence is a key challenge for solid state spin qubits. Tunnel coupling with electron Fermi reservoir provides robust charge state control in semiconductor quantum dots, but results in undesired relaxation of electron and nuclear spins through mechanisms that lack complete understanding. Here, we unravel the contributions of tunnelling-assisted and phonon-assisted spin relaxation mechanisms by systematically adjusting the tunnelling coupling in a wide range, including the limit of an isolated quantum dot. These experiments reveal fundamental limits and trade-offs of quantum dot spin dynamics: while reduced tunnelling can be used to achieve electron spin qubit lifetimes exceeding 1 s, the optical spin initialisation fidelity is reduced below 80%, limited by Auger recombination. Comprehensive understanding of electron-nuclear spin relaxation attained here provides a roadmap for design of the optimal operating conditions in quantum dot spin qubits.

Single-Period InAs–GaAs Quantum-Dot Infrared Photodetectors

2008 ◽  
Vol 20 (18) ◽  
pp. 1575-1577
Author(s):  
Shu-Ting Chou ◽  
Shih-Yen Lin ◽  
Chi-Che Tseng ◽  
Yi-Hao Chen ◽  
Cheng-Nan Chen ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Infrared Photodetectors ◽  
Single Period ◽  
Quantum Dot Infrared Photodetectors ◽  
Gaas Quantum Dot

scholarly journals Demonstration of a GaSb/GaAs Quantum Dot Intermediate Band Solar Cell Operating at Maximum Power Point

2020 ◽  
Vol 125 (24) ◽  
Author(s):  
I. Ramiro ◽  
J. Villa ◽  
J. Hwang ◽  
A. J. Martin ◽  
J. Millunchick ◽  
...  
Keyword(s):  
Solar Cell ◽  
Quantum Dot ◽  
Maximum Power ◽  
Maximum Power Point ◽  
Intermediate Band ◽  
Intermediate Band Solar Cell ◽  
Gaas Quantum Dot ◽  
Power Point
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