Stroboscopically Robust Gates For Capacitively Coupled Singlet-Triplet Qubits
arXiv:1810.04208 · doi:10.1103/PhysRevA.99.012347
Abstract
Recent work on Ising-coupled double-quantum-dot spin qubits in GaAs with voltage-controlled exchange interaction has shown improved two-qubit gate fidelities from the application of oscillating exchange along with a strong magnetic field gradient between adjacent dots. By examining how noise propagates in the time-evolution operator of the system, we find an optimal set of parameters that provide passive stroboscopic circumvention of errors in two-qubit gates to first order. We predict over 99% two-qubit gate fidelities in the presence of quasistatic and 1/ noise, which is an order of magnitude improvement over the typical unoptimized implementation.
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