Three-qubit Parity Gate via Simultaneous Cross Resonance Drives

• URL: http://arxiv.org/abs/2309.11287v2
• Date: Thu, 5 Oct 2023 01:41:55 GMT
• Title: Three-qubit Parity Gate via Simultaneous Cross Resonance Drives
• Authors: Toshinari Itoko, Moein Malekakhlagh, Naoki Kanazawa, and Maika Takita
• Abstract summary: We show an efficient implementation of a three-qubit parity gate on two control qubits with a common target. We also demonstrate that our simultaneous parity gates can significantly improve the parity measurement error probability for the heavy-hexagon code on an IBM Quantum processor.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Native multi-qubit parity gates have various potential quantum computing applications, such as entanglement creation, logical state encoding and parity measurement in quantum error correction. Here, using simultaneous cross-resonance drives on two control qubits with a common target, we demonstrate an efficient implementation of a three-qubit parity gate. We have developed a calibration procedure based on the one for the echoed cross-resonance gate. We confirm that our use of simultaneous drives leads to higher interleaved randomized benchmarking fidelities than a naive implementation with two consecutive CNOT gates. We also demonstrate that our simultaneous parity gates can significantly improve the parity measurement error probability for the heavy-hexagon code on an IBM Quantum processor using seven superconducting qubits with all-microwave control.

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