Year: 2025
Type: preprint
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.
Source: arXiv (Cornell University)
Authors: Tsoukalas, Konstantinos, Orekhov, Alexei, Hetényi, Bence, von Lüpke, Uwe, Arunseangroj, Jeth, Seidler, Inga, Sommer, Lisa, Kelly, Eoin G., Massai, Leonardo, Aldeghi, Michele, Pita-Vidal, Marta, Bedell, Stephen W., Paredes, Stephan, Schupp, Felix J., Mergenthaler, Matthias, Salis, Gian, Fuhrer, Andreas, Harvey-Collard, Patrick
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4416834459
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