Superconducting Quantum Chip Subspace Segmentation
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Solution Overview
Problem
As the number of Qubits in superconducting quantum computing systems increases, existing technologies face challenges in efficiently performing operations due to exponential increases in matrix dimensions, leading to limitations in calculating pulse waveforms for large-scale systems, such as only being able to handle up to 13 Qubits with current commercial computers.
Innovation Solution
A superconducting quantum computing system with a control circuit and a quantum chip featuring connection regions and a central exchange region, where the coupling strength between suspended and regular superconducting bits is adjustable, allowing for isolation of subspace regions for single-bit or multi-bit logic gate manipulations and enabling efficient transition of two-bit gate operations between regions using numerical optimization pulses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of Qubits in the system increases, then the computing power and quantum manipulation capability are improved, but the matrix operation dimensions processed by numerical optimization pulse technology increase exponentially, making calculation infeasible for large-scale systems
Solution Approach 1:
The patent divides the large-scale quantum system into multiple connection regions, each containing a manageable number of Qubits (e.g., 4-6 Qubits per region). This segmentation allows numerical optimization to be performed on smaller subspaces independently, avoiding the exponential complexity that would arise from optimizing the entire system at once. The divided subspace approach enables scalable quantum computing by breaking down the intractable large-scale optimization problem into multiple tractable small-scale problems.
2Quantity of substance
If surrounding Qubits are present to increase system scale, then the system size is improved, but interference and crosstalk between Qubits increase, reducing operation fidelity
Solution Approach 1:
By segmenting the quantum system into isolated connection regions, the patent minimizes interference and crosstalk between Qubits. Each region acts as an independent subspace where quantum operations can be performed with high fidelity without being affected by distant Qubits. This spatial segmentation effectively contains harmful interactions within local boundaries.
Solution Approach 2:
The patent introduces suspended Qubits as intermediary elements that mediate interactions between regular Qubits and between different connection regions. These suspended Qubits serve as controlled coupling mechanisms, allowing selective interaction when needed while maintaining isolation when not needed, thus reducing unwanted crosstalk while enabling necessary quantum operations.
3Measurement precision
If numerical optimization pulse technology is used to design high fidelity pulse waveforms, then operation accuracy is improved, but the computational resources required become prohibitive for systems larger than approximately 13 Qubits
Solution Approach 1:
The patent applies segmentation by performing numerical optimization on divided subspaces containing only 4-6 Qubits each, rather than attempting to optimize the entire large-scale system. This reduces the matrix operation dimensions from exponential scale to manageable sizes, enabling high-fidelity pulse waveform design through numerical optimization while maintaining computational feasibility. The optimized pulses for each subspace can then be combined to achieve high fidelity across the entire system.
Data Source
AI summary
A superconducting quantum computing system includes a control system and a superconducting quantum chip. The superconducting quantum chip includes at least two connection regions and a first central exchange region. Each of the at least two connection regions includes a first suspended superconducting bit and at least one superconducting bit. The first central exchange region includes the first suspended superconducting bit, and is used to transfer a quantum operation between superconducting bits in different connection regions. A control circuit is configured to control a coupling strength between the first suspended superconducting bit and the superconducting bit. Therefore, a single connection region or a central exchange region can be isolated by controlling the coupling strength between the first suspended superconducting bit and the superconducting bit, thereby effectively obtaining a divided subspace. A two-bit gate manipulation between different connection regions may be transited by using the central exchange region.