Quantum Gate Frequency Configuration for Leakage Removal
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Solution Overview
Problem
Quantum computing systems face significant challenges in managing leakage states, which can cause inaccurate evaluations of quantum algorithms and propagate errors, as leakage from computational states |0 and |1 into non-computational states |2 and beyond is destructive and difficult to mitigate.
Innovation Solution
The system configures qubits with distinct transition frequencies, where a higher-frequency side is implemented for measurement qubits and a lower-frequency side for data qubits, allowing for periodic resetting of measurement qubits to remove leakage states, thereby reducing the impact of leakage conditions on the quantum computing system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum gate operations are implemented with equal transition frequencies for all qubits, then the system structure is simple and easy to control, but leakage states cannot be effectively isolated and removed
Solution Approach 1:
The patent applies local quality by assigning different transition frequencies to different qubits based on their functional roles. Measurement qubits are configured with higher transition frequencies while data qubits use lower frequencies. This localized frequency differentiation enables measurement qubits to effectively isolate and remove leakage states from data qubits, solving the leakage problem without requiring complete system redesign.
Solution Approach 2:
The patent segments the quantum computing system into distinct functional groups: data qubits for computation and measurement qubits for error correction. By implementing different frequency configurations for each segment, the system enables targeted leakage state management where measurement qubits can be periodically reset to remove leakage without affecting data qubit operations.
2Measurement precision
If measurement qubits are periodically reset to remove leakage states, then computational accuracy improves, but the operation time and complexity of the quantum system increase
Solution Approach 1:
The patent implements periodic action by resetting measurement qubits at regular intervals during quantum computation. This periodic reset mechanism allows leakage states to be removed from measurement qubits without continuously interrupting data qubit operations, thereby maintaining computational accuracy while minimizing time loss through efficient, scheduled intervention.
3Productivity
If leakage states are allowed to propagate in the quantum system, then the system operates continuously without interruption, but computational errors increase and accuracy decreases
Solution Approach 1:
The patent extracts leakage states from the computational system by using measurement qubits as dedicated leakage sinks. Measurement qubits are configured with higher transition frequencies that allow them to absorb and isolate leakage states from data qubits. These isolated leakage states are then removed through periodic measurement qubit resets, preventing error propagation while maintaining computational continuity.
Data Source
AI summary
A quantum computing system configured for removal of leakage states can include quantum hardware including a first qubit and a second qubit, wherein the first qubit is configured to have a first transition frequency and wherein the second qubit is configured to have a second transition frequency, the first transition frequency being greater than the second transition frequency. The quantum computing system can include one or more quantum control devices configured to control operation of at least the first qubit and the second qubit, wherein the one or more quantum control devices are configured to implement a quantum gate operation on the first qubit and the second qubit based at least in part on the first transition frequency and the second transition frequency, and wherein the one or more quantum control devices are configured to periodically reset a quantum state of the first qubit.