Electron–longitudinal-acoustic-phonon scattering in double-quantum-dot based quantum gates

2008 ◽  
Vol 372 (10) ◽  
pp. 1666-1670 ◽  
Author(s):  
Peiji Zhao ◽  
Dwight L. Woolard
Keyword(s):  
Quantum Dot ◽  
Acoustic Phonon ◽  
Phonon Scattering ◽  
Quantum Gates ◽  
Double Quantum ◽  
Longitudinal Acoustic ◽  
Double Quantum Dot ◽  
Longitudinal Acoustic Phonon

scholarly journals Dynamical second-order noise sweetspots in resonantly driven spin qubits

Quantum ◽  
2021 ◽  
Vol 5 ◽  
pp. 607
Author(s):  
Jordi Picó-Cortés ◽  
Gloria Platero
Keyword(s):  
Quantum Dot ◽  
Exchange Interaction ◽  
Second Order ◽  
Quantum Gates ◽  
Double Quantum ◽  
Dephasing Time ◽  
Double Quantum Dot ◽  
Spin Triplet ◽  
Charge Noise ◽  
Qubit States

Quantum dot-based quantum computation employs extensively the exchange interaction between nearby electronic spins in order to manipulate and couple different qubits. The exchange interaction, however, couples the qubit states to charge noise, which reduces the fidelity of the quantum gates that employ it. The effect of charge noise can be mitigated by working at noise sweetspots in which the sensitivity to charge variations is reduced. In this work we study the response to charge noise of a double quantum dot based qubit in the presence of ac gates, with arbitrary driving amplitudes, applied either to the dot levels or to the tunneling barrier. Tuning with an ac driving allows to manipulate the sign and strength of the exchange interaction as well as its coupling to environmental electric noise. Moreover, we show the possibility of inducing a second-order sweetspot in the resonant spin-triplet qubit in which the dephasing time is significantly increased.

scholarly journals Optimal control of universal quantum gates in a double quantum dot

2018 ◽  
Vol 97 (23) ◽  
Author(s):  
Leonardo K. Castelano ◽  
Emanuel F. de Lima ◽  
Justino R. Madureira ◽  
Marcos H. Degani ◽  
Marcelo Z. Maialle
Keyword(s):  
Optimal Control ◽  
Quantum Dot ◽  
Quantum Gates ◽  
Double Quantum ◽  
Double Quantum Dot ◽  
Universal Quantum

scholarly journals On the robustness of the hybrid qubit computational gates through simulated randomized benchmarking protocols

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Elena Ferraro ◽  
Marco De Michielis
Keyword(s):  
Quantum Dot ◽  
Noise Model ◽  
Statistical Characteristics ◽  
Quantum Gates ◽  
Average Error ◽  
Double Quantum ◽  
Double Quantum Dot ◽  
Quantum Processor ◽  
Noise Characterization ◽  
Specific Quantum

Abstract One of the main challenges in building a quantum processor is to characterize the environmental noise. Noise characterization can be achieved by exploiting different techniques, such as randomization where several sequences of random quantum gates are applied to the qubit under test to derive statistical characteristics about the affecting noises. A scalable and robust algorithm able to benchmark the full set of Clifford gates using randomization techniques is called randomized benchmarking. In this study, we simulated randomized benchmarking protocols in a semiconducting all-electrical three-electron double-quantum dot qubit, i.e. hybrid qubit, under different error models, that include quasi-static Gaussian and the more realistic 1/f noise model, for the input controls. The average error of specific quantum computational gates is extracted through interleaved randomized benchmarking obtained including Clifford gates between the gate of interest. It provides an estimate of the fidelity as well as theoretical bounds for the average error of the gate under test.

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

Electron transport in T-shaped double quantum dot structure

2021 ◽  
Vol 53 (8) ◽  
Author(s):  
Mohammed A. A. Abbas ◽  
Lafy F. Al-Badry ◽  
Amin H. Al-Khursan
Keyword(s):  
Electron Transport ◽  
Quantum Dot ◽  
Double Quantum ◽  
Double Quantum Dot
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