Hybrid Quantum-Classical Compilation with Quantum Basic Blocks
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Solution Overview
Problem
Current quantum computing systems lack a flexible and programmable model for executing hybrid classical-quantum algorithms, and there is a need for efficient integration of quantum instructions within a classical processor pipeline to reduce overhead and improve performance.
Innovation Solution
The integration of quantum instructions within an existing processor pipeline, including the addition of a quantum engine to the processor's execution unit, a quantum-classical interface for connectivity between the quantum engine and the quantum processor, and the use of a qubit index generation unit to address qubits in a scalable manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If quantum instructions are integrated within an existing processor pipeline, then execution efficiency and performance are improved, but device complexity increases due to adding a quantum engine and interface components
Solution Approach 1:
The patent merges quantum instructions with classical instructions within a unified processor pipeline. The quantum engine is integrated into the existing processor architecture, allowing quantum and classical operations to share common resources such as registers, memory, and control logic. This integration enables seamless execution of hybrid quantum-classical algorithms without requiring separate dedicated hardware for quantum operations.
Solution Approach 2:
The processor architecture is designed to be universal, capable of executing both classical and quantum instructions using the same basic hardware resources. The quantum engine shares the processor's execution units, memory subsystem, and control mechanisms with classical operations, making the system multi-functional and reducing overall hardware requirements compared to dedicated quantum processors.
2Adaptability or versatility
If a quantum engine is added to the processor's execution unit, then quantum operations can be executed efficiently, but the processor architecture becomes more complex
Solution Approach 1:
The processor architecture is segmented into distinct functional units: a classical execution unit for traditional operations and a quantum engine for quantum operations. These segments work in conjunction within the unified pipeline, with the quantum engine handling quantum-specific tasks while the classical unit manages conventional computations. This segmentation allows for modular design and independent optimization of each execution path.
Solution Approach 2:
A quantum-classical interface is introduced as an intermediary component that facilitates communication and coordination between the quantum engine and the rest of the processor architecture. This interface handles the translation and synchronization of operations, managing the complexity of integrating quantum and classical systems by providing a standardized interaction protocol.
3Loss of time
If quantum instructions are seamlessly integrated with classical operations, then overhead is reduced, but the difficulty of detecting and measuring quantum operations increases
Solution Approach 1:
The patent employs different instruction encoding schemes that can be detected by their structural characteristics (analogous to color changes). Quantum instructions have distinct encoding patterns compared to classical instructions, allowing the pipeline to automatically identify and route quantum operations to the quantum engine. This differentiation mechanism enables seamless integration while maintaining detectability through structural analysis of the instruction stream.
Data Source
AI summary
Apparatus and method for compiling and executing hybrid classical-quantum programs. For example, one embodiment of a method comprises: reading source code specifying both non-quantum operations to be performed by a host processor and quantum operations to be performed by a quantum accelerator; compiling the source code to generate a target object file, wherein portions of the source code specifying the quantum operations are compiled into quantum basic blocks (QBBs) in the target object file, each QBB comprising one or more quantum instructions to be executed by the quantum accelerator and wherein portions of the source code specifying the non-quantum operations are compiled into native instructions to be executed by the host processor.