Remote entangling gates for spin qubits in quantum dots using a charge-sensitive superconducting coupler
Harry Hanlim Kang, Ilan T. Rosen, Max Hays, Jeffrey A. Grover, William D. Oliver
DOI 10.1103/PhysRevApplied.23.044055 · Physical Review Applied
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Abstract
We propose a method to realize microwave-activated cz gates between two remote spin qubits in quantum dots using a charge-sensitive superconducting coupler. The qubits are longitudinally coupled to the coupler, such that the transition frequency of the coupler depends on the logical qubit states; a capacitive network model using first-quantized charge operators is developed to illustrate this. Driving the coupler transition then implements a conditional phase shift on the qubits. Two pulsing schemes are investigated: a rapid, off-resonant pulse with constant amplitude, and a pulse with envelope engineering that incorporates dynamical decoupling to mitigate charge noise. We develop non-Markovian time-domain simulations to accurately model gate performance in the presence of 1/fβ charge noise. Simulation results indicate that a cz gate fidelity exceeding 90% is possible with realistic parameters and noise models.
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