Remote Entangling Gates for Spin Qubits in Quantum Dots using an Offset-Charge-Sensitive Transmon Coupler

• URL: http://arxiv.org/abs/2409.08915v1
• Date: Fri, 13 Sep 2024 15:31:10 GMT
• Title: Remote Entangling Gates for Spin Qubits in Quantum Dots using an Offset-Charge-Sensitive Transmon Coupler
• Authors: Harry Hanlim Kang, Ilan T. Rosen, Max Hays, Jeffrey A. Grover, William D. Oliver,
• Abstract summary: We propose a method to realize microwave-activated CZ gates between two remote spin qubits in quantum dots. The qubits are longitudinally coupled to the coupler, so that the transition frequency of the coupler depends on the logical qubit states. We develop non-Markovian time-domain simulations to accurately model gate performance in the presence of $1/fbeta$ charge noise.
• Score: 0.2796197251957245
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a method to realize microwave-activated CZ gates between two remote spin qubits in quantum dots using an offset-charge-sensitive transmon coupler. The qubits are longitudinally coupled to the coupler, so 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 $1/f^\beta$ charge noise. Simulation results indicate that a CZ gate fidelity exceeding 90% is possible with realistic parameters and noise models.

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