Tunable two-electron spin states in quantum dot structures and the applicability for making spin qubits

2002 ◽  
Author(s):  
S. Tarucha ◽  
K. Ono ◽  
D.G. Austing ◽  
S. Sasaki ◽  
T. Fujisawa ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Electron Spin ◽  
Spin States ◽  
Spin Qubits

Entanglement dynamics of two electron-spin qubits in a strongly detuned and dissipative quantum-dot-cavity system

2011 ◽  
Vol 84 (6) ◽  
pp. 065010 ◽  
Author(s):  
Shao-Hua Xiang ◽  
Xiao-Peng Deng ◽  
Ke-Hui Song ◽  
Wei Wen ◽  
Zhen-Gang Shi
Keyword(s):  
Quantum Dot ◽  
Electron Spin ◽  
Entanglement Dynamics ◽  
Spin Qubits ◽  
Cavity System

Entanglement of two-electron spin states in a double quantum dot

2017 ◽  
Vol 15 (01) ◽  
pp. 1750006 ◽  
Author(s):  
V. G. Bagrov ◽  
D. M. Gitman ◽  
A. D. Levin ◽  
M. S. Meireles
Keyword(s):  
Magnetic Field ◽  
Quantum Dot ◽  
Electron Spin ◽  
Coherent Control ◽  
Spin Exchange ◽  
Time Dependent ◽  
Double Quantum ◽  
Spin States ◽  
Quantum Bit ◽  
Double Quantum Dot

Recently, an implementation of a universal set of one- and two-quantum-bit gates for quantum computation using spin states of coupled single-electron quantum dots was proposed. It was demonstrated that it is possible to execute a coherent control of a quantum system based on two-electron spin states in a double quantum dot, allowing state preparation, coherent manipulation, and projective readout. This possibility is based on rapid electrical control of the spin exchange interaction. These results motivated us to develop a formal theoretical study of the corresponding model of two coupled spins placed in a magnetic field and subjected to a time-dependent mutual Heisenberg interaction. Using possible exact solutions of the corresponding quantum problem, we study entangling of different separable initial states in this model. It is demonstrated that the entanglement due to a time-dependent Heisenberg interaction is dominating in comparison with the entanglement due to the action of an external magnetic field.

scholarly journals Single-Shot Readout of Electron Spin States in a Quantum Dot Using Spin-Dependent Tunnel Rates

2005 ◽  
Vol 94 (19) ◽  
Author(s):  
R. Hanson ◽  
L. H. Willems van Beveren ◽  
I. T. Vink ◽  
J. M. Elzerman ◽  
W. J. M. Naber ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Electron Spin ◽  
Single Shot ◽  
Spin States
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