Journal Article

FZJ-2024-07003

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Lattice Hamiltonians and stray interactions within quantum processors

Xu, X.FZJ* ; Manabputra ; Vignes, C. ; Ansari, M. H. (Corresponding author)FZJ* ; Martinis, J. M. (Corresponding author)

2024
American Physical Society College Park, Md. [u.a.]

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Please use a persistent id in citations: doi:10.1103/PhysRevApplied.22.064030  doi:10.34734/FZJ-2024-07003

Abstract: Developing Hamiltonian models for quantum processors with many qubits on the same chip is crucial for advancing quantum computing technologies. Stray couplings between qubits lead to errors in gate operations. This study underscores the importance of incorporating lattice Hamiltonians into quantum circuit design. By comparing many-body effects with two-body stray couplings, we show how adjusting circuit parameters can increase two-qubit-gate fidelity. We find that loosely decoupled qubits result in weaker stray interactions and higher gate fidelity, challenging conventional assumptions. We investigate the scenario where three-body 𝑍⁢𝑍⁢𝑍 interaction surpasses two-body 𝑍⁢𝑍 interactions, highlighting the transformative potential of lattice Hamiltonians for novel multiqubit gates. Moreover, we investigate the cross-resonance gate within the lattice-Hamiltonian framework and examine the impact of microwave pulses on stray coupling. This emphasizes the necessity of developing a comprehensive theoretical framework that includes lattice interactions, which are now critical given the sophistication of contemporary quantum hardware. These insights are vital for developing fault-tolerant quantum computing and next-generation quantum processors.

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Contributing Institute(s):

1. Theoretische Nanoelektronik (PGI-2)

Research Program(s):

1. 5223 - Quantum-Computer Control Systems and Cryoelectronics (POF4-522) (POF4-522)
2. 5221 - Advanced Solid-State Qubits and Qubit Systems (POF4-522) (POF4-522)
3. 5214 - Quantum State Preparation and Control (POF4-521) (POF4-521)
4. Verbundprojekt: German Quantum Computer based on Superconducting Qubits (GEQCOS) - Teilvorhaben: Charakterisierung, Kontrolle und Auslese (13N15685) (13N15685)
5. OpenSuperQPlus - Open Superconducting Quantum Computers (101113946) (101113946)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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