Efficient motional-mode characterization for high-fidelity trapped-ion quantum computing

Abstract

To achieve high-fidelity operations on a large-scale quantum computer, the parameters of the physical system must be efficiently characterized with high accuracy. For trapped ions, the entanglement between qubits are mediated by the motional modes of the ion chain, and thus characterizing the motional-mode parameters becomes essential. In this paper, we develop and explore physical models that accurately predict both magnitude and sign of the Lamb-Dicke parameters when the modes are probed {\it in parallel}. We further devise an advanced characterization protocol that shortens the characterization time by more than an order of magnitude, when compared to that of the conventional method that only uses mode spectroscopy. We discuss potential ramifications of our results to the development of a scalable trapped-ion quantum computer, viewed through the lens of system-level resource trade offs.

18 pages, 8 figures

References in corpus (4)

• Modular Entanglement of Atomic Qubits using both Photons and Phonons
• Efficient ground-state cooling of large trapped-ion chains with an EIT tripod scheme
• Designing Filter Functions of Frequency-Modulated Pulses for High-Fidelity Two-Qubit Gates in Ion Chains
• Experimental Bayesian calibration of trapped ion entangling operations

Cited by in corpus (5)

• Quantum Error Correction with Metastable States of Trapped Ions Using Erasure Conversion
• Quantum Simulation of Spin-Boson Models with Structured Bath
• Seeking a quantum advantage with trapped-ion quantum simulations of condensed-phase chemical dynamics
• Benchmarking bosonic modes for quantum information with randomized displacements
• Pulse optimization for high-precision motional-mode characterization in trapped-ion quantum computers