Work

Three-qubit parity gate via simultaneous cross-resonance drives

Year: 2024

Type: article

Abstract: Native multiqubit 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 that 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 controlled not 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.

Source: Physical Review Applied

DOI: 10.1103/physrevapplied.21.034018

Authors: Toshinari Itoko, Moein Malekakhlagh, Naoki Kanazawa, Maika Takita

Institutions: IBM Research - Tokyo, IBM (United States), IBM Research - Thomas J. Watson Research Center

Language: English

Topic: Quantum Information and Cryptography

Subfield: Artificial Intelligence

Field: Computer Science

Domain: Physical Sciences

Open Access status: green

Funder: Army Research Office

Award: G2746316034