Quantum Circuit Local Iterative Tuning
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Solution Overview
Problem
Existing methods for tuning quantum states in qubit circuits are time-consuming and complex due to the need for extensive data lines and external computer processing, limiting scalability.
Innovation Solution
A quantum technology circuit with locally associated components, including a qubit circuit, bias circuit, read-out circuit, and adjusting circuit, which iteratively adjusts the bias signal to achieve the desired quantum state without external data transmission, using highly integrated electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If external computer processing is used to tune quantum states, then processing capability is improved, but device complexity and data transmission requirements increase
Solution Approach 1:
The patent merges the quantum state tuning functionality directly into the cryostat by integrating the adjusting circuit with the qubit circuit and read-out circuit. This eliminates the need for external computer processing and extensive data lines, reducing device complexity while maintaining automation capability through local iterative algorithms.
Solution Approach 2:
The patent introduces an intermediary adjusting circuit that operates locally within the cryostat to mediate between the qubit circuit and the control system. This intermediary component enables automated tuning without requiring direct external computer connection, thus reducing the complexity of data transmission infrastructure.
2Device complexity
If manual tuning methods are used, then device complexity is reduced, but time expenditure for adjustment increases
Solution Approach 1:
The patent implements a feedback mechanism through the read-out circuit that continuously monitors the quantum state and feeds this information back to the adjusting circuit. This enables automated iterative adjustment to converge on the desired quantum state, significantly reducing tuning time compared to manual methods while keeping the circuit configuration relatively simple.
Solution Approach 2:
The patent enables the system to self-tune by integrating the adjusting circuit that automatically modifies bias signals based on read-out feedback. This self-service capability eliminates the need for manual intervention in the tuning process, reducing time expenditure while maintaining moderate device complexity through local integration.
3Extent of automation
If more data lines are added for external processing, then processing capability is improved, but scalability is reduced
Solution Approach 1:
The patent merges all necessary processing functionality within the cryostat boundaries, eliminating the need for external data lines. This local integration approach maintains processing capability for quantum state tuning while enabling scalability, as the self-contained module can be replicated and added to the system without increasing data transmission infrastructure complexity.
Data Source
AI summary
The invention relates to a quantum technology circuit (1) comprising the following circuit components (3, 4, 5, 6, 7, 8) that are locally associated with one another: a qubit circuit (3) with quantum states that can be adjusted as a function of a bias signal; a bias circuit (4) for applying an output bias signal (11), encoded by an input signal (10) of the bias circuit (4), to the qubit circuit (3); a read-out circuit (5), communicatively connected to the qubit circuit (3), for reading out a quantum state adjusting in response to the applied output bias signal (11) and for outputting a read-out signal (13) encoding the read-out quantum state; and an adjusting circuit (6), communicatively connected to the bias circuit (4) and the read-out circuit (5), for executing an iterative algorithm which applies iterative values for the input signal (10) to the bias circuit (4), starting with an initial value, and continues the iteration, as a function of the respective responsively output read-out signal (13) of the read-out circuit (5), until the output read-out signal (13) corresponds to the adjustment of a desired quantum state.