2014/07/31 by Xin Wang, F. A. Calderon-Vargas, Fernando A. Calderon-Vargas +6
Computer Science · Physics and Astronomy · #Computer science #Materials science #Noise (video) #Optoelectronics #Physics #Quantum #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum mechanics #Quantum-Dot Cellular Automata #Qubit #Silicon #Spin (aerodynamics) #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.90.155306
published as Phys. Rev. B 90, 155306 (2014) · 8 pages, 5 figures
openalex publication_date 2014/10/14 · arxiv created 2014/10/21 · arxiv updated 2014/10/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the performance of supcode---a family of dynamically correcting pulses designed to cancel simultaneously both Overhauser and charge noise for singlet-triplet spin qubits---adapted to silicon devices with electrostatic control. We consider both natural Si and isotope-enriched Si systems, and in each case we investigate the behavior of individual gates under static noise and perform randomized benchmarking to obtain the average gate error under realistic 1/f noise. We find that in most cases supcode pulses offer roughly an order of magnitude reduction in gate error, and especially in the case of isotope-enriched Si, supcode yields gate operations of very high fidelity. We also develop a version of supcode that cancels the charge noise only, ``\ensuremathδJ-supcode,'' which is particularly beneficial for isotope-enriched Si devices where charge noise dominates Overhauser noise, offering a level of error reduction comparable to the original supcode while yielding gate times that are 30%--50% shorter. Our results show that the supcode noise-compensating pulses provide a fast, simple, and effective approach to error suppression, bringing gate errors well below the quantum error correction threshold in principle.