Stray Multiqubit Interactions in Quantum Processors
POSTER
Abstract
Unintended interactions between qubits, known as stray couplings, negatively impact gate operations, leading to errors[1,2,3]. This poster highlights the significance of incorporating the lattice Hamiltonian into quantum circuit design and operation. By comparing the intensity of three-body versus two-body stray couplings, we identify non-trivial circuit parameter domains that help to enhance fidelity of two-qubit gates, particularly beyond dispersive regime. Additionally, we demonstrate instances where three-body ZZZ interactions surpass two-body ZZ interactions within the parameter space relevant to quantum computing, indicating the potential use of lattice Hamiltonian for designing novel multi-qubit gates essential for advancing quantum computing technologies.
*This research received funding from Horizon Europe (HORIZON) Project: 101113946 OpenSuperQPlus100.
Publication:[1] J. Ku, X. Xu, M. Brink, D. C. McKay, J. B. Hertzberg, M. H. Ansari, B. L. T Plourde, Suppression of Unwanted ZZ Interactions in a Hybrid Two-Qubit system. arXiv:2003.02775 (2020), https://doi.org/10.48550/arXiv.2003.02775 [2] X. Xu, and M. H. Ansari, ZZ Freedom in Two Qubit Gates. arXiv:2009.00485 (2020), https://doi.org/10.48550/arXiv.2009.00485 [3] X. Xu, and M. H. Ansari, Parasitic-free gate: A protected switch between idle and entangled states. arXiv:2202.05208 (2022), https://doi.org/10.48550/arXiv.2202.05208 [4] X. Xu, Manabputra, C. Vignes, M. H. Ansari, J. M. Martinis, Lattice Hamiltonians and Stray Interactions Within Quantum Processors. arXiv:2402.09145 (2024), https://doi.org/10.48550/arXiv.2402.09145
