Modular Rydberg Qubit Arrays Using Bell-Pair Communication
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Solution Overview
Problem
Current quantum computing platforms face scalability and fault tolerance challenges due to engineering constraints and high error rates, particularly in large-scale quantum computers requiring thousands of logical qubits and trillions of operations, with existing modular architectures facing issues with low fidelity Bell pairs and increased local operation requirements.
Innovation Solution
A modular, fault-tolerant quantum computing architecture using Rydberg arrays with large modules connected via optical cavity photonic interconnects, employing teleported gates and noisy shared Bell pairs to maintain fault tolerance without increasing local operation fidelity requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If modular architectures are used to scale quantum computers, then system size can be increased, but Bell pair fidelity decreases and local operation requirements increase
Solution Approach 1:
The quantum computing system is divided into multiple independent modules (first array and second array of neutral atoms), each capable of autonomous operation with its own syndrome qubits for error correction. This segmentation allows scaling to larger systems while maintaining module-level reliability.
Solution Approach 2:
Communication qubits serve as intermediaries between modules, forming Bell pairs to enable inter-module interactions. The communication qubits act as a buffer that isolates modules from each other's errors while still enabling coordinated quantum operations across the distributed system.
2Reliability
If more syndrome qubits are added for error correction, then fault tolerance improves, but device complexity increases
Solution Approach 1:
Each module has its own dedicated syndrome qubits that perform error correction locally within that module. This local quality approach allows each module to be optimized independently for fault tolerance without requiring global coordination, managing complexity through modular autonomy.
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
Enables scalable and fault-tolerant quantum computing by allowing large modules to be connected with low-fidelity Bell pairs, maintaining local gate fidelity and achieving faster code cycles than previous architectures, supporting up to half a million qubits without local gate degradation.
Implementation Method 1
each neutral atom arranged to impose a Rydberg blockade on at least its nearest neighbors in its array when in the excited Rydberg state
Implementation Method 2
each communication qubit of the first subarray array forming a Bell pair with one communication qubit of the second subarray
Data Source
AI summary
Modular Rydberg architectures for fault tolerant quantum computing are provided. A first array and a second array of neutral atoms are provided. Each neutral atom has a first state and an excited Rydberg state. Each neutral atom is arranged to impose a Rydberg blockade on at least its nearest neighbors in its array when in the excited Rydberg state, thereby implementing a plurality of physical qubits. Each array comprises data qubits, and syndrome qubits. The syndrome qubits are configured to implement a quantum error correcting code with respect to the data qubits. Each array includes a subarray of communication qubits having a lower dimensionality than the array. Each communication qubit of the first subarray forms a Bell pair with one communication qubit of the second subarray. The first and second arrays of neutral atoms are configured to interact with each other only via the communication qubits.