scholarly journals Micromagnets for coherent control of spin-charge qubit in lateral quantum dots

2007 ◽  
Vol 90 (2) ◽  
pp. 024105 ◽  
Author(s):  
M. Pioro-Ladrière ◽  
Y. Tokura ◽  
T. Obata ◽  
T. Kubo ◽  
S. Tarucha
Keyword(s):  
Quantum Dots ◽  
Coherent Control ◽  
Charge Qubit

Few-Particle Effects in Nonlinear Optical Spectra of Semiconductor Quantum Dots

1999 ◽  
Vol 571 ◽  
Author(s):  
Ulrich Hohenesteri ◽  
Fausto Rossi ◽  
Elisa Molinari
Keyword(s):  
Quantum Dots ◽  
Density Matrix ◽  
Nonlinear Optical ◽  
Coherent Control ◽  
Optical Spectra ◽  
Carrier Dynamics ◽  
Semiconductor Quantum Dots ◽  
Nonequilibrium Carrier ◽  
Optical Nonlinearities ◽  
Matrix Approach

ABSTRACTWe present a density-matrix approach for the description of nonequilibrium carrier dynamics in optically excited semiconductor quantum dots, that explicitly accounts for exciton-exciton as well as exciton-carrier interactions. Within this framework, we analyze few-particle effects in the optical spectra and provide a consistent description of additional peaks appearing at high photoexcitation density. We discuss possible applications of such optical nonlinearities in future coherent-control experiments.

scholarly journals Optical control of the spin of a magnetic atom in a semiconductor quantum dot

Nanophotonics ◽  
2015 ◽  
Vol 4 (1) ◽  
pp. 75-89 ◽  
Author(s):  
L. Besombes ◽  
H. Boukari ◽  
C. Le Gall ◽  
A. Brunetti ◽  
C.L. Cao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fine Structure ◽  
Solid State ◽  
Laser Field ◽  
Coherent Control ◽  
Spin Dynamics ◽  
Optical Control ◽  
Zero Magnetic Field ◽  
Magnetic Atom ◽  
Resonant Laser

Abstract:The control of single spins in solids is a key but challenging step for any spin-based solid-state quantumcomputing device. Thanks to their expected long coherence time, localized spins on magnetic atoms in a semiconductor host could be an interesting media to store quantum information in the solid state. Optical probing and control of the spin of individual or pairs of Manganese (Mn) atoms (S = 5/2) have been obtained in II-VI and IIIV semiconductor quantum dots during the last years. In this paper, we review recently developed optical control experiments of the spin of an individual Mn atoms in II-VI semiconductor self-assembled or strain-free quantum dots (QDs).We first show that the fine structure of the Mn atom and especially a strained induced magnetic anisotropy is the main parameter controlling the spin memory of the magnetic atom at zero magnetic field. We then demonstrate that the energy of any spin state of a Mn atom or pairs of Mn atom can be independently tuned by using the optical Stark effect induced by a resonant laser field. The strong coupling with the resonant laser field modifies the Mn fine structure and consequently its dynamics.We then describe the spin dynamics of a Mn atom under this strong resonant optical excitation. In addition to standard optical pumping expected for a resonant excitation, we show that the Mn spin population can be trapped in the state which is resonantly excited. This effect is modeled considering the coherent spin dynamics of the coupled electronic and nuclear spin of the Mn atom optically dressed by a resonant laser field. Finally, we discuss the spin dynamics of a Mn atom in strain-free QDs and show that these structures should permit a fast optical coherent control of an individual Mn spin.

Spin-charge qubit resonance readout in lateral quantum dots

2007 ◽  
Vol 40 (2) ◽  
pp. 347-350
Author(s):  
M. Pioro-Ladrière ◽  
Y. Tokura ◽  
T. Obata ◽  
T. Kubo ◽  
K. Yoshida ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Qubit

Coherent Control of Stress-Induced InGaAs Quantum Dots by Means of Phonon-Assisted Resonant Photoluminescence

2001 ◽  
Vol 224 (2) ◽  
pp. 461-464 ◽  
Author(s):  
A.V. Baranov ◽  
V. Davydov ◽  
A.V. Fedorov ◽  
H.-W. Ren ◽  
S. Sugou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Coherent Control

scholarly journals Charge qubit entanglement in double quantum dots

2006 ◽  
Vol 76 (5) ◽  
pp. 905-911 ◽  
Author(s):  
S Weiss ◽  
M Thorwart ◽  
R Egger
Keyword(s):  
Quantum Dots ◽  
Double Quantum ◽  
Charge Qubit ◽  
Double Quantum Dots

scholarly journals Tunable charge qubit based on barrier-controlled triple quantum dots

2018 ◽  
Vol 98 (3) ◽  
Author(s):  
Xu-Chen Yang ◽  
Guo Xuan Chan ◽  
Xin Wang
Keyword(s):  
Quantum Dots ◽  
Charge Qubit ◽  
Triple Quantum Dots
Sign in / Sign up

Export Citation Format

Share Document