Quantum Circuit Mapping With Adjacent ACUs for Low-Latency Control
Find Innovative SolutionsGenerate Solutions
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 analog conversion units (ACUs) that select qubits based on latency to generate quantum circuits with reduced latency, optimizing the placement of ACUs to minimize latency and maintain coherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If qubit readout and classical logic processing are performed using conventional ACU configurations, then quantum computation can be executed, but latency exceeds qubit coherence times rendering computation inoperable
Solution Approach 1:
The patent introduces a new spatial dimension for ACU placement by utilizing positions adjacent to qubits on the quantum chip, rather than using conventional remote ACU configurations. This dimensional change in physical placement enables direct proximity coupling between ACUs and qubits, dramatically reducing signal transmission latency while maintaining system functionality.
Solution Approach 2:
The patent implements local quality by placing ACUs in immediate proximity to specific qubits they serve, creating localized quantum-classical interaction zones. This local placement optimizes the quantum-classical interface for each individual qubit-ACU pair, minimizing latency for readout and control operations while preserving the overall quantum computation capability.
2Device complexity
If ACUs are placed remotely from qubits, then system interconnectivity is simplified, but latency increases to 500 nanoseconds or 1 microsecond exceeding coherence times
Solution Approach 1:
The patent resolves this contradiction by transitioning from remote ACU placement to adjacent ACU placement on the quantum chip, utilizing the spatial dimension of the chip substrate. This dimensional transition enables ACUs to be positioned directly next to qubits, simultaneously simplifying interconnectivity within the local vicinity and reducing latency to acceptable levels within coherence times.
Solution Approach 2:
The patent applies segmentation by dividing the quantum computing system into localized qubit-ACU pairs or groups, where each ACU is physically associated with specific qubits. This segmentation creates modular units with minimized internal latency, allowing each segment to operate semi-independently while maintaining overall system functionality and simplified interconnectivity between segments.
3Productivity
If conventional quantum circuits are executed with standard ACU configurations, then quantum programs can run, but latency consumes much of the coherence budget
Solution Approach 1:
The patent implements preliminary action by pre-positioning ACUs in optimal adjacent locations to qubits before quantum computation begins. This advance placement ensures that when quantum circuits are executed, the ACUs are already in position to perform readout and control operations with minimal latency, thereby preserving coherence budget and enabling higher computation throughput within available coherence times.
Solution Approach 2:
By utilizing the spatial dimension of the quantum chip substrate to place ACUs adjacent to qubits, the patent creates a new operational regime where quantum-classical interactions occur over minimal distances. This dimensional approach reduces the time consumed by readout and control operations, preserving more of the coherence budget for actual quantum computation and thereby improving overall 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, enabling efficient quantum computation within qubit coherence times.
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.