Autler-Townes Frequency Shift for Qubit Coherence Analysis

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Solution Overview

Problem

Existing techniques for analyzing qubit coherence parameters are cumbersome, time-consuming, and resource-intensive, particularly when dealing with two-level systems (TLS) that cause decoherence and noise in quantum logic circuits.

Innovation Solution

A system and method that employ an Autler-Townes off-resonant tone to shift the frequency of a qubit, allowing for the determination of qubit coherence parameters by analyzing the probability of the qubit being in a particular state at different shifted frequencies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If existing techniques are used to analyze qubit coherence parameters, then measurement precision can be achieved, but the process becomes cumbersome, time-consuming, and resource-intensive

Engineering Contradiction:

Improvequbit coherence parameter measurementVSAvoidanalysis time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies parameter changes by utilizing the Autler-Townes effect to dynamically shift the qubit frequency as a control parameter. By varying the frequency shift amount, the system can probe different coherence parameters without requiring time-consuming traditional measurement sequences, thereby reducing analysis time while maintaining measurement precision.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces traditional mechanical measurement approaches with a quantum mechanical effect-based method. Instead of using conventional pulse sequences and time-domain analysis, the system uses the Autler-Townes frequency shift effect to directly probe coherence parameters in the frequency domain, significantly reducing the time and computational resources required.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If existing techniques are used to analyze qubit coherence parameters, then measurement precision can be achieved, but the process becomes cumbersome and resource-intensive

Engineering Contradiction:

Improvequbit coherence parameter measurementVSAvoidanalysis process complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent implements universality by using a single frequency shift mechanism (Autler-Townes effect) to probe multiple different coherence parameters and characteristics of two-level systems. The same frequency shift approach can reveal information about T1 relaxation times, T2 coherence times, and other parameters, eliminating the need for multiple separate measurement protocols and reducing overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent introduces the frequency-shifted qubit state as an intermediary that mediates between the measurement system and the coherence parameters. By using the Autler-Townes effect to create a shifted frequency state, the system can indirectly probe coherence properties without directly measuring them through complex sequences, simplifying the overall measurement process.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Loss of information

If traditional methods are used to study two-level systems, then understanding can be gained, but the process is time-consuming

Engineering Contradiction:

Improveinformation about two-level systemsVSAvoiddata collection time

Core Design Contradiction:

Loss of informationVSLoss of time

Solution Approach 1:

The patent applies preliminary action by using the Autler-Townes frequency shift to pre-condition the qubit state before measurement. By shifting the frequency in advance, the system prepares the qubit in a state that is more favorable for rapid coherence parameter extraction, allowing information about two-level systems to be obtained more quickly without requiring extended measurement durations.

Inventive Principle:

Principle #10Preliminary action

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

This approach enables a rapid understanding of qubit coherence parameters and fluctuations, facilitating better scheduling and operation of quantum jobs, and providing insights into two-level systems affecting qubit performance.

Implementation Method 1

emit a second pulse comprising an Autler-Townes off-resonant tone and shifting the frequency of the qubit

Methodology Applied

Scientific EffectAutler-Townes effect:

Data Source

PatentUS12236317B2Energy relaxation spectroscopy using autler-townes effect

Publication Date: 2025.02.25 INTERNATIONAL BUSINESS MACHINE CORPORATION

AI summary

One or more systems, devices, computer program products and/or computer-implemented methods of use provided herein relate to analysis of qubit coherence parameters of a physical qubit layout of a quantum computer. A system can comprise a pulse component for transmitting signals to a qubit, a readout component for receiving signals form the qubit, a memory that stores computer executable component, and a processor that executes the computer executable components stored in the memory. The computer executable components are executable to cause the pulse component to generate a first pulse to drive the qubit, cause the pulse component to generate a second pulse comprising an Autler-Townes off-resonant tone, and determine a probability relative to the qubit, in view of a shift of the qubit to a shifted frequency caused by the second pulse.