2013/05/31 by Sebastian Mehl, David P. DiVincenzo · 15 citations
Engineering · Physics and Astronomy · #Advancements in Semiconductor Devices and Circuit Design #Atomic orbital #Atomic physics #Charge (physics) #Charge qubit #Condensed matter physics #Electron #Excited state #Noise (video) #Phase qubit #Physics #Quantum #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Qubit #Semiconductor Quantum Structures and Devices #Singlet state #Spin (aerodynamics) #Symmetry (geometry) #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.88.161408
published in Physical Review B 88(16) (American Physical Society) · 7 pages, 3 figures
openalex publication_date 2013/10/28 · arxiv created 2014/08/05 · arxiv updated 2014/08/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Singlet-triplet spin qubits in six-electron double quantum dots, in moderate magnetic fields, can show superior immunity to charge noise. This immunity results from the symmetry of orbitals in the second energy shell of circular quantum dots: singlet and triplet states in this shell have identical charge distributions. Our phase-gate simulations, which include 1/f charge noise from fluctuating traps, show that this symmetry is most effectively exploited if the gate operation switches rapidly between sweet spots deep in the (3,3) and (4,2) charge stability regions; fidelities very close to 1 are predicted if subnanosecond switching can be performed.