Resonant two-qubit gates for fermionic simulations with spin qubits

• URL: http://arxiv.org/abs/2507.13781v1
• Date: Fri, 18 Jul 2025 09:52:12 GMT
• Title: Resonant two-qubit gates for fermionic simulations with spin qubits
• Authors: Konstantinos Tsoukalas, Alexei Orekhov, Bence Hetényi, Uwe von Lüpke, Jeth Arunseangroj, Inga Seidler, Lisa Sommer, Eoin G. Kelly, Leonardo Massai, Michele Aldeghi, Marta Pita-Vidal, Stephen W. Bedell, Stephan Paredes, Felix J. Schupp, Matthias Mergenthaler, Gian Salis, Andreas Fuhrer, Patrick Harvey-Collard,
• Abstract summary: We show a method to implement the fSim gate set in spin qubits using a single pulse combining baseband and resonant exchange drives.<n>This approach minimizes gate duration and drive amplitude, mitigating decoherence and crosstalk.<n>Our results establish a practical route toward a versatile and efficient two-qubit gate set for spin-based quantum processors.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In gate-defined semiconductor spin qubits, the highly tunable Heisenberg exchange interaction is leveraged to implement fermionic two-qubit gates such as CZ and SWAP. However, the broader family of fermionic simulation (fSim) gates remains unexplored, and has the potential to enhance the performance of near-term quantum simulation algorithms. Here, we demonstrate a method to implement the fSim gate set in spin qubits using a single pulse combining baseband and resonant exchange drives. This approach minimizes gate duration and drive amplitude, mitigating decoherence and crosstalk. We validate its effectiveness by realizing a resonant iSWAP gate between two hole spins in germanium, achieving a fidelity of 93.8(5)% extracted with interleaved randomized benchmarking. Quantum process tomography confirms accurate gate calibration and identifies qubit decoherence as the dominant error source. Our results establish a practical route toward a versatile and efficient two-qubit gate set for spin-based quantum processors.

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