Topological Superconducting Qubit Circuit for Noise-Resistant Coherence
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Solution Overview
Problem
Quantum computers face challenges in maintaining the integrity of quantum information due to sensitivity to noise, which affects the coherence time of qubits and accuracy of quantum gate operations.
Innovation Solution
A topological superconducting qubit circuit is designed with a plurality of physical qubits and coupling devices, including φ-Josephson junctions, operating in a topological regime where EJq^2 > EJφ*cos(φ0) > EJq^3, to induce topological protection and reduce noise sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional quantum circuits are used, then quantum computations can be performed, but the quantum information is highly sensitive to noise resulting in short coherence time
Solution Approach 1:
The quantum circuit is segmented into multiple physical qubits that are coupled together to form a topological qubit. This segmentation allows the quantum information to be distributed across multiple physical components, making it more robust against local noise disturbances and extending the effective coherence time of the system.
Solution Approach 2:
The patent employs a composite structure combining multiple physical superconducting qubits with φ-Josephson junctions to create a topological qubit system. This composite architecture leverages the properties of individual components to achieve topological protection, where the collective behavior provides enhanced noise resistance and extended coherence time compared to individual qubits.
2Reliability
If topological protection is implemented using multiple physical qubits and φ-Josephson junctions, then noise resistance and coherence time are improved, but the device complexity increases
Solution Approach 1:
The patent utilizes parameter changes in the Josephson energy ratios (EJq/EJφ) and Josephson phase (φ0) to achieve topological protection. By carefully controlling these parameters to satisfy specific inequalities, the system transitions into a topologically protected regime that provides noise resistance without requiring complex control mechanisms, thus managing device complexity through parameter optimization rather than structural complexity.
3Reliability
If the Josephson energy ratio satisfies EJq^2 > EJφ*cos(φ0) > EJq^3, then topological protection is achieved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent establishes specific parameter ranges for Josephson energies (EJq, EJφ) and Josephson phase (φ0) that satisfy the inequality EJq^2 > EJφ*cos(φ0) > EJq^3. By defining these parameter boundaries, the invention provides clear manufacturing targets that guide the fabrication process, making it easier to achieve topological protection while managing precision requirements through well-defined parameter specifications.
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
The circuit achieves improved coherence time and resistance to noise, enabling more stable quantum computations by operating in a topologically protected regime with reduced noise disturbances from control signals.
Implementation Method 1
The coupling devices comprise at least one φ-Josephson junction, wherein a Josephson phase φ0 of the φ-Josephson junction is non-zero in a ground state
Data Source
AI summary
There is described herein a topologically protected quantum circuit with superconducting qubits and method of operation thereof. The circuit comprises a plurality of physical superconducting qubits and a plurality of coupling devices interleaved between pairs of the physical superconducting qubits. The coupling devices comprise at least one φ-Josephson junction, wherein a Josephson phase φ0 of the φ-Josephson junction is non-zero in a ground state, the coupling devices have a Josephson energy EJφ, the physical superconducting qubits have a Josephson energy EJq, and the circuit operates in a topological regime whenEJq2>-EJφ cos φ0>EJq3.