Qubit T1 Estimation Using Frequency Shifts for Faster Screening
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Solution Overview
Problem
Superconducting qubits exhibit temporal fluctuations in energy relaxation times (T1), making it challenging to obtain representative measures for process optimization and device screening, and existing techniques for analyzing qubit coherence parameters are cumbersome and time-consuming, especially for single junction transmons with limited tunability.
Innovation Solution
A system and method that employs frequency shifting methods like Autler-Townes effect to probe the frequency space of qubits, enabling rapid estimation of energy relaxation times by sampling measurements at shifted frequencies and determining correlation frequency-lengths, thereby improving qubit coherence parameter understanding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If T1 measurements are taken at multiple shifted frequencies to obtain representative measures, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The patent applies preliminary action by performing T1 measurements at multiple shifted frequencies before final device screening or process optimization. By collecting frequency-dependent T1 data in advance and establishing correlation frequency-lengths, the system creates a predictive model that enables rapid estimation without requiring full measurement campaigns at the time of decision-making. This preliminary sampling at shifted frequencies prepares the system to quickly forecast T1 characteristics later.
Solution Approach 2:
The patent uses copying by measuring T1 at shifted frequencies that correlate with the unperturbed qubit frequency. Instead of directly measuring at the target frequency every time, the system copies the T1 characteristics from nearby shifted frequencies using the established correlation model. This allows rapid estimation of T1 at the unperturbed frequency by referencing measurements taken at shifted frequencies, significantly reducing measurement time while maintaining precision.
2Productivity
If frequency shifting methods are used to probe qubit frequency space, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically varying the qubit frequency through controlled shifts while measuring T1 at each shifted frequency. By changing the frequency parameter and mapping its relationship with T1, the system establishes correlation frequency-lengths that characterize how T1 varies with frequency shifts. This parameter-based approach enables rapid screening of qubits by predicting T1 at operational frequencies from measurements at shifted frequencies, greatly improving productivity despite the added complexity of frequency control mechanisms.
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 allows for faster and more accurate forecasting of qubit usability and screening, reducing resource waste by quickly identifying qubits with stable coherence times, thus enhancing quantum processor performance and fault-tolerant computing.
Implementation Method 1
employs frequency shifting methods like Autler-Townes effect to probe the frequency space of qubits
Data Source
AI summary
One or more systems, devices, computer program products and/or computer-implemented methods of use provided herein relate to determining estimated energy relaxation times of qubits. A system can comprise a memory configured to store computer executable components; and a processor configured to execute the computer executable components stored in the memory, wherein the computer executable components comprise a sampling component configured to sample a plurality of measurements of an energy relaxation time of a qubit at individual shifted qubit frequencies of a plurality of shifted qubit frequencies of the qubit; and an analysis component configured to perform an analysis, based on a protocol, to determine a correlation frequency-length between individual energy relaxation times measured at the individual shifted qubit frequencies.