Large-scale multi-qubit trap ion gate

A polynomial complexity optimization method for selecting drive frequencies and amplitudes in multi-qubit gates addresses the challenge of high fidelity and short gate times, enabling efficient and robust quantum computing with reduced circuit depth and improved fidelity.

JP2026520023APending Publication Date: 2026-06-19YEDA RES & DEV CO LTD +1
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Patent Information

Application Number
JP2025571200
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-06-05
Filing Date
2024-05-23
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Selecting a set of sideband frequencies and amplitudes to drive multi-qubit gates robustly and quickly is challenging due to the increasing number and complexity of normal modes of oscillations, especially for gates with more than 4 qubits, making it difficult to achieve high fidelity and short gate times.

Method used

A systematic method is provided to select drive frequencies and amplitudes for multi-qubit gates using a polynomial complexity optimization process, reducing the problem to a special instance with quadratic constraints, allowing for efficient generation of bipartite entanglement phases in parallel, even for gates with over 12 qubits.

Benefits of technology

Enables fast and robust multi-qubit gates with reduced circuit depth, improved coherence, and better fidelity, suitable for general-purpose quantum computing and quantum error correction schemes like surface codes.

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Abstract

We provide a large-scale multi-qubit trap ion gate. [Solution] A system (20) for quantum computing includes an array of qubits (40) and a radiation source (28) that simultaneously irradiates multiple qubits in the array with radiation containing a set of spectral components in multiple vibrational sidebands of the internal transition frequencies of the qubits, each having a different complex amplitude. The sidebands are generated by a group of normal modes having a minimum spacing Δf between their respective vibrational frequencies. A controller (32) initializes a multi-qubit gate containing at least five qubits to an initial state and drives the radiation source to irradiate each qubit with radiation containing the respective complex amplitude of the spectral components in a selected set, so as to switch the multi-qubit gate to a target state within a gate time of less than 50 / Δf.
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