Realization of High-fidelity Two-qubit Gates with a Tunable Coupler for Fluxonium Qubits
S. Wang (TU Delft - Applied Sciences)
Christian Kraglund Andersen – Mentor
F. Yilmaz – Mentor (TU Delft - QRD/Andersen Lab)
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Abstract
Quantum gates play an indispensable role in quantum computing, serving as the foundation for executing efficient quantum algorithms. In particular, the development and optimization of two-qubit gates have emerged as a significant challenge in the field. In this work, we propose an innovative structure, termed as the FXTFX (fluxoniumtransmon-fluxonium) system, leveraging a tunable transmon as the coupler for two fluxonium qubits to construct a two-qubit gate. Our FXTFX configuration demonstrates the capability to achieve a strong coupling strength between the coupler and fluxonium (g /2π = 226 MHz), while maintaining the Z Z interaction below 10 kHz. Utilizing this setup, I designed and simulated the CZ gate and show through rigorous simulations that a gate time of 66 ns produces a high gate fidelity of 99.88%.