Quantum Gate Group Calibration for Flux Crosstalk Mitigation
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Solution Overview
Problem
Existing quantum computing systems face challenges in efficiently calibrating and executing quantum programs due to issues like flux crosstalk and high calibration time, which affect gate performance and fidelity, especially in near-term applications with noisy devices.
Innovation Solution
A calibration process that augments groups of quantum logic operations with single-qubit identity gates and control operations to mitigate flux crosstalk and reduce calibration time, optimizing control parameters for specific quantum programs on quantum processing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional calibration processes are used for quantum logic gates, then comprehensive coverage of all gates is achieved, but calibration time becomes excessively long and flux crosstalk increases
Solution Approach 1:
The quantum program's logic gates are divided into groups that can be executed in parallel. The calibration process is segmented to calibrate multiple gates simultaneously rather than sequentially, reducing overall calibration time while maintaining comprehensive coverage of all gates.
Solution Approach 2:
Identity gates are added to the quantum program before calibration to establish a baseline state. Control operations are preliminarily configured to mitigate flux crosstalk during the calibration process, ensuring that the calibration proceeds with minimized interference while maintaining gate fidelity.
2Productivity
If parallel execution of quantum logic gates is implemented, then productivity increases, but flux crosstalk between gates worsens
Solution Approach 1:
Identity gates serve as intermediaries between parallel quantum logic gates. These identity gates maintain the quantum state without transformation, acting as buffers that prevent flux crosstalk from propagating between simultaneously executed gates while allowing parallel execution to proceed.
Solution Approach 2:
Control operations are designed to preemptively counteract flux crosstalk before it can affect parallel gate execution. By applying compensatory control signals in advance, the system mitigates the harmful effects of flux crosstalk while maintaining high execution efficiency through parallelization.
3Loss of time
If more quantum logic gates are calibrated simultaneously, then calibration time decreases, but control parameter optimization becomes more complex
Solution Approach 1:
The set of quantum logic gates to be calibrated is segmented into manageable groups that can be calibrated in parallel. This segmentation reduces the complexity of control parameter optimization for each group while maintaining overall calibration efficiency, as each subgroup can be optimized independently.
Solution Approach 2:
The calibration system uses automated control operations that self-adjust parameters during the calibration process. The system independently optimizes control parameters for each gate group without requiring manual intervention, reducing the perceived complexity while enabling simultaneous calibration of multiple gates.
Data Source
AI summary
In a general aspect, an augmented group of operations is calibrated for execution on a quantum processing unit. In some cases, a quantum program to be executed by a quantum processing unit is obtained. The quantum program includes a sequence of native quantum logic gates. A group of operations corresponding to a time step in the sequence is identified. The group of operations includes the native quantum logic gates that are applied to a first subset of qubits in parallel during the time step. An augmented group of operations is defined by adding single-qubit identity gates to the group. The single-qubit identity gates are applied to a second subset of qubits in parallel during the time step. A calibration process is performed over the first and second subsets of qubits to determine control parameters to execute the augmented group of operations on the quantum processing unit.