Investigation of Two Qubit Gates between Remote Spin
Qubits using a Superconducting Coupler
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kang-khanlim-sm-eecs-2025-thesis.pdf
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12.74 MB
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16f5426a6c6a441e4d153cc63d4d5d0f
Author(s)
Kang, Harry Hanlim
Advisor(s)
Oliver, William D.
Date Issued
February 2025
Publisher
Massachusetts Institute of Technology
Abstract
Circuit QED elements can facilitate entanglement generation between distant spin qubits, acting as a quantum bus to connect different parts of future spin-based quantum processors. Here, microwave-activated phase gates between two remote, gate-defined spin qubits, where an offset-charge-sensitive (OCS) transmon coupler is driven, are proposed. The spin qubits, specifically resonant-exchange (RX) qubits, are longitudinally coupled to the coupler such that the coupler’s frequency depends on the logical states of the qubits. The capacitance network model is used to describe the coupling between the quantum dots and the coupler, using first-quantized charge operators instead of second quantized field operators. Two pulse sequences are investigated: a faster, off-resonant drive pulse with constant amplitude, and a pulse with envelope engineering that incorporates dynamical decoupling to mitigate charge noise. The main source of decoherence for the system is the 1/f ᵝ charge noise, with β ∼ 1. The non-Markovian time-domain simulations in the presence of charge noise are employed to accurately predict the gate performance. Simulation results suggest that a CZ gate fidelity exceeding 90% is possible with realistic parameters and noise models.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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