scholarly journals Two-Qubit Gate of Combined Single-Spin Rotation and Interdot Spin Exchange in a Double Quantum Dot

2011 ◽  
Vol 107 (14) ◽  
Author(s):  
R. Brunner ◽  
Y.-S. Shin ◽  
T. Obata ◽  
M. Pioro-Ladrière ◽  
T. Kubo ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Spin Exchange ◽  
Spin Rotation ◽  
Double Quantum ◽  
Single Spin ◽  
Double Quantum Dot ◽  
Qubit Gate

scholarly journals Single-spin manipulation in a double quantum dot in the field of a micromagnet

2014 ◽  
Vol 90 (23) ◽  
Author(s):  
Stefano Chesi ◽  
Ying-Dan Wang ◽  
Jun Yoneda ◽  
Tomohiro Otsuka ◽  
Seigo Tarucha ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Double Quantum ◽  
Single Spin ◽  
Spin Manipulation ◽  
Double Quantum Dot

scholarly journals Intrinsic errors in transporting a single-spin qubit through a double quantum dot

2017 ◽  
Vol 96 (1) ◽  
Author(s):  
Xiao Li ◽  
Edwin Barnes ◽  
J. P. Kestner ◽  
S. Das Sarma
Keyword(s):  
Quantum Dot ◽  
Double Quantum ◽  
Single Spin ◽  
Double Quantum Dot ◽  
Spin Qubit

scholarly journals Non-Ideal X-Gate and Z-Gate in Semiconducting Spin Qubit Implementations

Proceedings ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 53
Author(s):  
Elena Ferraro ◽  
Marco Fanciulli ◽  
Marco De Michielis
Keyword(s):  
Quantum Dot ◽  
Quantum Computation ◽  
Double Quantum ◽  
Time Interval ◽  
Effective Hamiltonian ◽  
Single Qubit ◽  
Hamiltonian Models ◽  
Double Quantum Dot ◽  
Spin Qubit ◽  
Qubit Gate

Several spin qubit architectures have been proposed, theoretically investigated and realized at least on the scale of single devices in view of quantum computation and simulation applications. We focus our study on five qubit types: quantum dot spin qubit, double quantum dot singlet-triplet qubit, double quantum dot hybrid qubit, donor qubit, quantum dot spin-donor qubit and for each one we derived a compact effective Hamiltonian. Single qubit gate fidelities when time interval error is included are compared. A realistic set of values for the error parameters of amplitude controls linked to the z and x contribution appearing in the Hamiltonian models has been used. This study provides a ranking of the gate fidelities for the different qubit architectures highlighting which one is the most robust with respect to the considered control noises.

Controllable interdot coupling in a Si-based double quantum dot system for a qubit gate

2014 ◽  
Vol 64 (11) ◽  
pp. 1626-1629
Author(s):  
J. J. Lee ◽  
J. S. Kim ◽  
S. J. Shin ◽  
J. B. Choi ◽  
D. G. Hasko
Keyword(s):  
Quantum Dot ◽  
Double Quantum ◽  
Double Quantum Dot ◽  
Interdot Coupling ◽  
Qubit Gate

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.

Single-Spin Readout in a Double Quantum Dot Including a Micromagnet

2010 ◽  
Vol 104 (4) ◽  
Author(s):  
Yun-Sok Shin ◽  
Toshiaki Obata ◽  
Yasuhiro Tokura ◽  
Michel Pioro-Ladrière ◽  
Roland Brunner ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Double Quantum ◽  
Single Spin ◽  
Double Quantum Dot

scholarly journals Large Voltage-Tunable Spin Valve Based on a Double Quantum Dot

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Patrycja Tulewicz ◽  
Kacper Wrześniewski ◽  
Szabolcs Csonka ◽  
Ireneusz Weymann
Keyword(s):  
Quantum Dot ◽  
Spin Valve ◽  
Double Quantum ◽  
Double Quantum Dot

Fano Effect in T-Shaped Double Quantum Dot Structure with Decoherence Effect

2008 ◽  
Vol 49 (3) ◽  
pp. 771-776 ◽  
Author(s):  
Gao Wen-Zhu ◽  
Gong Wei-Jiang ◽  
Zheng Yi-Song ◽  
Liu Yu ◽  
Lü Tian-Quan
Keyword(s):  
Quantum Dot ◽  
Double Quantum ◽  
Fano Effect ◽  
Double Quantum Dot ◽  
Decoherence Effect
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