Superconducting Quantum Circuit for Configurable Many-Body Coupling
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Solution Overview
Problem
Existing quantum annealing schemes face challenges in achieving a sufficient four-body interaction for combinatorial optimization problems, requiring complex designs and adjustments for couplers with nonlinear elements like Josephson junctions.
Innovation Solution
A quantum circuit apparatus using a coupler made of linear elements, coupled with qubits that have varying nonlinearities, allows for the configuration of a desired strength of many-body interaction without the need for bias lines or input/output lines for frequency adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nonlinear element such as a Josephson junction is used as a coupler, then a four-body interaction can be achieved, but the design and manufacture becomes complex and requires frequency adjustment lines
Solution Approach 1:
The patent extracts the nonlinear element (Josephson junction) from the coupler and relocates it to the qubits themselves. The coupler is simplified to linear elements only, while the qubits are designed with varying nonlinearities to generate the necessary many-body interactions. This separation resolves the contradiction by eliminating the complex nonlinear coupler design while maintaining the required interaction strength.
Solution Approach 2:
Instead of making the coupler nonlinear to achieve many-body interactions, the patent inverts the approach by making the qubits nonlinear and the coupler linear. The many-body interaction is generated by the combination of linear coupler and nonlinear qubits with different frequencies, reversing the conventional approach and simplifying the coupler design.
2Adaptability or versatility
If a frequency-variable coupler is used, then the coupling strength can be adjusted, but time and man-hours are required for calibration and adjustment
Solution Approach 1:
The patent applies preliminary action by fixing the coupler frequency at a specific value during manufacturing, eliminating the need for post-manufacturing calibration and adjustment. The coupler is designed with a fixed frequency that works with the qubit frequency range, allowing the system to be ready for use without time-consuming calibration procedures.
Solution Approach 2:
The patent adopts a disposable approach by using a fixed-frequency coupler that is manufactured with a specific frequency and cannot be adjusted. This eliminates the need for calibration equipment, bias lines, and adjustment procedures, significantly reducing the time and resources required for system setup and operation.
3Ease of operation
If bias lines and input/output lines are provided for frequency adjustment, then the coupler frequency can be controlled, but the wiring complexity and measurement instrument requirements increase
Solution Approach 1:
The patent extracts and removes the frequency adjustment capability from the coupler by using a fixed-frequency design. This eliminates the need for bias lines, input/output lines, and associated measurement instruments, significantly reducing wiring complexity while maintaining operational ease through a simpler architecture.
Solution Approach 2:
The patent applies self-service by designing the coupler with a fixed frequency that is inherently suitable for the qubit operating range. The system operates without requiring external frequency adjustment mechanisms, bias lines, or complex wiring infrastructure, as the fixed-frequency coupler self-adapts to work with the qubit frequency range.
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 simplifies the design and operation of quantum circuits by eliminating the need for complex frequency adjustments and wiring, while enabling strong and configurable many-body interactions among qubits.
Implementation Method 1
a frequency difference between a resonance frequency of a qubit and a resonance frequency of the coupler
Implementation Method 2
a nonlinear element such as a Josephson junction (JJ) is used as a coupler
Data Source
AI summary
A quantum circuit apparatus includes a coupler made up of one or more linear elements and at least three or more qubits coupled with a many-body interaction via the coupler, wherein at least one qubit out of the at least three or more qubits has a nonlinearity different from that of one or more other qubits.