Quantum Circuit Mapping With ACU Placement for Low Latency
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Solution Overview
Problem
High latency in quantum computation due to communication between quantum and classical logic, particularly qubit readout and classical logic processing, exceeds qubit coherence times, rendering quantum computation inoperable.
Innovation Solution
A quantum circuit generator with a controller and multiple analog conversion units (ACUs) connected to qubits, which selects qubits based on classical bits to minimize latency by optimizing the placement of ACUs and reducing latency in quantum circuit generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If qubit readout and classical logic processing are performed using conventional ACU architecture, then quantum computation can be executed, but latency exceeds qubit coherence times rendering computation inoperable
Solution Approach 1:
The system segments the ACU architecture into multiple specialized units: quantum interface units (QIUs) for quantum-to-classical conversion, classical processing units (CPUs) for logic operations, and quantum control units (QCUs) for microwave pulse generation. This segmentation allows parallel processing of quantum readout and classical logic operations, reducing overall latency while maintaining computation operability
Solution Approach 2:
The patent introduces classical buffers and FIFO queues as intermediary components between quantum measurement units and classical logic units. These intermediaries decouple the timing constraints of quantum operations from classical processing, allowing data to be staged and processed at optimal rates without exceeding qubit coherence times
2Adaptability or versatility
If communication between different ACUs is required for quantum circuit execution, then circuit functionality is achieved, but latency increases to about 500 nanoseconds or 1 microsecond which exceeds qubit coherence times
Solution Approach 1:
The patent merges previously separate ACU functions into an integrated quantum processing system where QIUs, CPUs, and QCUs operate as a unified architecture. This consolidation eliminates inter-ACU communication overhead by allowing direct data flow between adjacent functional units within the same processing domain, reducing latency from 500 nanoseconds to acceptable levels
Solution Approach 2:
The system reorganizes the processing architecture from a sequential multi-ACU model to a parallel hierarchical model with multiple processing levels. Quantum operations, classical logic, and control functions operate simultaneously in different processing dimensions, allowing complex circuit functionality to be achieved without sequential inter-ACU communication delays
3Productivity
If more ACUs are used to process quantum signals, then signal processing capability is improved, but system complexity and interconnectivity requirements increase
Solution Approach 1:
Each ACU in the patent is designed as a universal processing unit capable of performing multiple functions: quantum state readout, classical logic operations, microwave pulse generation, and data buffering. This multi-functionality allows the system to achieve high signal processing capability with fewer units, reducing interconnectivity complexity while maintaining productivity
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
Reduces latency in quantum circuits to below threshold levels, ensuring efficient quantum computation within qubit coherence times by strategically mapping qubits and ACUs, thereby enhancing the operational feasibility of quantum computers.
Implementation Method 1
Each ACU is configured to convert a digital input from the controller into an analog input at a microwave frequency to control a quantum state of the corresponding qubit
Data Source
AI summary
A quantum circuit generator for a quantum computer includes a controller; and a plurality of analog conversion units (ACUs) operatively connected to the controller, each ACU being operatively connected to a corresponding qubit of a plurality of qubits, wherein each ACU is configured to convert a digital input from the controller into an analog input at a microwave frequency to control a quantum state of the corresponding qubit. The controller is configured to generate a quantum circuit using at least two qubits of the plurality of qubits, the at least two qubits being selected by the controller based on corresponding classical bits being mapped by the controller and based on latency of the generated quantum circuit so that the generated quantum circuit has a latency less than a threshold latency.