Quantum Controller Network Timing With Delay-Scheduled Synchronization
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Solution Overview
Problem
Existing quantum control systems suffer from increased error rates due to latency issues when modules with unknown operation durations synchronize on a slow periodic grid, leading to desynchronization and reduced qubit lifetime.
Innovation Solution
A hierarchical network with a distributor that synchronizes clocks and compensates for propagation delays using a delay schedule, ensuring simultaneous data exchange without reliance on a slow time grid, utilizing a distributor to manage message transmission across quantum controllers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If modules synchronize on a slow periodic grid to maintain alignment, then synchronicity between modules is maintained, but latency increases and error rates increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal delay values for each controller in a delay schedule before runtime. During operation, controllers simply retrieve and apply these pre-determined delay values, eliminating the need for slow periodic synchronization while maintaining precise temporal alignment. This transforms a runtime synchronization problem into a pre-computed configuration solution.
Solution Approach 2:
The patent replaces the mechanical periodic grid synchronization system with a computational delay compensation system. Instead of relying on periodic clock cycles and status exchange protocols, the system uses pre-calculated delay values stored in memory to achieve precise synchronization. This substitution eliminates the inherent latency of periodic grids while maintaining synchronicity.
2Stability of the object's composition
If modules wait for the next grid point to update status, then all information is updated simultaneously on all modules, but qubit lifetime decreases due to increased error rates
Solution Approach 1:
The delay schedule is pre-computed based on the network topology and propagation characteristics before the quantum algorithm executes. This preliminary calculation captures all synchronization requirements, allowing controllers to operate independently without waiting for periodic status updates. The pre-computed delays ensure that information propagates through the network with precise timing, maintaining synchronization without extending qubit operation time.
Solution Approach 2:
Each controller independently applies its predetermined delay value from the delay schedule to its outgoing signals, achieving self-synchronization without needing to query or update information from other controllers. This eliminates the need for periodic status exchange while maintaining consistent temporal relationships across all controllers, thereby preserving qubit lifetime.
3Loss of time
If a hierarchical network with delay compensation is implemented, then latency is reduced and synchronization is maintained, but device complexity increases
Solution Approach 1:
The complex task of calculating optimal delay values for each controller is performed once during system initialization or configuration, before the quantum algorithm executes. The results are stored in a simple lookup table (delay schedule) that controllers access during runtime. This shifts the computational complexity from runtime operation to initial setup, maintaining low latency during actual quantum operations while keeping the runtime device structure relatively simple.
Solution Approach 2:
The patent replaces complex runtime synchronization mechanics (periodic status exchanges, waiting protocols, inter-controller communication) with a simple delay value retrieval and application mechanism. Each controller independently fetches its predetermined delay value and applies it to its signals, eliminating the need for complex synchronization protocols while achieving precise temporal alignment across the network.
Data Source
AI summary
A method for controlling data transmission in a hierarchical network, preferably a star network, of data processing devices, the data processing devices including controllers, e.g. quantum controllers, and a distributor, wherein the method comprises: receiving, by the distributor, a reference clock signal for synchronizing clocks of the data processing devices in the network; synchronizing, by the distributor, a clock of the distributor based on the reference clock signal, so that the clock of the distributor is synchronized with the clocks of the controllers; and, controlling, by the distributor, time-delayed transmission of a data message to at least part of the controllers so that the transmitted data messages simultaneously arrive at the controllers, the time-delayed transmission being based on a delay schedule including information about propagation delays associated with point-to-point connections between the distributor and the controllers.