Coupling Control Resonators for Selective Qubit Frequency Shifting

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Solution Overview

Problem

Existing quantum computing systems face challenges in selectively shifting qubit resonance frequencies to facilitate efficient quantum logic gate operations and qubit entanglement.

Innovation Solution

A quantum computing system with coupling control resonators and signal lines that shift qubit resonance frequencies by tuning Josephson inductance using magnetic or electrical signals, allowing for selective qubit resonance and entanglement through frequency-division multiplexing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If coupling control resonators are used to selectively shift qubit resonance frequencies, then quantum logic gate operations are improved, but device complexity increases

Engineering Contradiction:

Improvequantum logic gate operationsVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The coupling control resonators serve multiple functions: they act as frequency shifters for qubits, enable selective coupling between qubits, and provide a unified control mechanism across the quantum processor. This multi-functionality allows the same hardware infrastructure to support various quantum logic gate operations without requiring separate dedicated components for each function.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system dynamically changes the resonance frequency parameter of qubits by applying control signals to the coupling control resonators. This parameter modulation enables selective coupling and decoupling of qubits, facilitating quantum logic gate operations. The frequency shifting is achieved by tuning the resonator frequency to match the qubit transition frequency, creating a controllable interaction channel.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If multiple coupling control resonators are used for frequency shifting, then selective qubit resonance is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveselective qubit resonanceVSAvoidmanufacturing precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

Each coupling control resonator is designed with specific local characteristics tailored to its target qubit or qubit pair. The resonators have customized frequency ranges, coupling strengths, and geometric configurations optimized for their specific function. This local optimization allows selective frequency shifting of individual qubits without requiring all resonators to meet identical precision specifications.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system employs dynamic frequency tuning capabilities where the coupling control resonators can adjust their resonance frequencies in real-time through control signals. This dynamic adaptation compensates for manufacturing variations and drift, maintaining selective resonance capability without requiring extremely tight manufacturing tolerances. The resonators can be programmed to operate at precise frequencies during operation even if their physical dimensions have variations.

Inventive Principle:

Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables efficient and interference-minimized qubit resonance and entanglement, simplifying chip design and reducing the need for direct current sources, while supporting various quantum logic gate operations.

Implementation Method 1

The first coupling control resonator is configured to shift the resonance frequency of the first qubit when the coupling control signal includes a frequency component in the resonance frequency band of the first coupling control resonator

Methodology Applied

Scientific EffectMagnetic coupling: Electromagnetic Induction

Implementation Method 2

each qubit in the plurality of qubits comprises at least one Josephson junction

Methodology Applied

Scientific EffectJosephson effect: Josephson Effect

Implementation Method 3

The first qubit is capacitively coupled to the third qubit and the second qubit is capacitively coupled to the fourth qubit

Methodology Applied

Scientific EffectCapacitive coupling: Capacitance

Data Source

PatentUS12451870B2Selective frequency shifting of qubits

Publication Date: 2025.10.21 IQM FINLAND OY

AI summary

A quantum computing system, a method, a computer program, and an arrangement for selectively shifting qubit resonance frequencies are disclosed herein. According to an embodiment, an arrangement for selectively shifting qubit resonance frequencies in a quantum computing system comprises a plurality of qubits including at least a first qubit and a second qubit, and a plurality of coupling control resonators including at least a first coupling control resonator and a second coupling control resonator. The arrangement also includes a coupling control signal line. The first coupling control resonator may be configured to shift the resonance frequency of the first qubit when the coupling control signal includes a frequency component in the resonance frequency band of the first coupling control resonator.