2021/07/31 by Jordi Picó-Cortés, Gloria Platero
Computer Science · Physics and Astronomy · #Charge (physics) #Charge qubit #Computer science #Condensed matter physics #Dephasing #Exchange interaction #Flux qubit #Noise (video) #Phase qubit #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum computer #Quantum dot #Quantum mechanics #Quantum noise #Qubit #Spin (aerodynamics) #Spins #Superconducting quantum computing #cond-mat.mes-hall
paper · pdf · doi:10.22331/q-2021-12-23-607
published as Quantum 5, 607 (2021) · 13 pages, 6 figures
arxiv created 2021/12/09 · openalex publication_date 2021/12/23 · arxiv updated 2021/12/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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.