Quantum Computer Cluster Phase Compensation Across Cryostats

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Solution Overview

Problem

Existing quantum computing systems face challenges in maintaining coherence and scalability due to limitations in interconnecting distinct quantum computer systems and managing control signals efficiently.

Innovation Solution

A quantum computer cluster is formed with multiple interconnected quantum systems housed in distinct cryostats, using coherent interlinks for entanglement and a global controller for phase compensation, along with local control chips to condition digital pulse waveforms for improved coherence and data exchange.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple quantum computer systems are interconnected to increase computational power, then scalability and computational capability are improved, but maintaining coherence and managing control signals becomes more difficult

Engineering Contradiction:

Improvecomputational powerVSAvoidcontrol signal management

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The system divides control functionality into local control chips for each quantum processing unit, which condition digital pulse waveforms locally before transmission. This segmentation reduces the complexity of centralized control by distributing control tasks across multiple independent units, allowing each chip to manage only its local qubits while maintaining overall system coherence through standardized interfaces.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Local control chips act as intermediary devices between the quantum processing units and the classical control systems. These chips condition digital pulse waveforms locally, converting raw control signals into precisely conditioned signals appropriate for each qubit's specific requirements, thereby simplifying the interface between classical and quantum domains while maintaining coherence across the distributed system.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If quantum processing units are housed in distinct cryostats to improve system modularity, then ease of manufacture and scalability are improved, but maintaining phase coherence across separate systems becomes more difficult

Engineering Contradiction:

Improvesystem modularityVSAvoidphase coherence

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Each quantum processing unit is housed in a separate cryostat with its own local control chip, creating modular independent units that can be manufactured and tested separately. This segmentation enables parallel manufacturing and easier replacement or upgrade of individual units without affecting the entire system, while standardized coherent interlinks maintain phase coherence across the distributed architecture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system uses phase compensation techniques that dynamically adjust the phase parameters of control signals to account for variations between distinct cryostats. By monitoring and compensating for phase drift through feedback mechanisms, the system maintains coherent operation across physically separated quantum processing units despite environmental differences between cryostats.

Inventive Principle:

Principle #35Parameter changes

3Measurement precision

If local control chips condition digital pulse waveforms to improve coherence, then qubit control precision is improved, but device complexity increases

Engineering Contradiction:

Improvequbit control precisionVSAvoidcontrol chip architecture

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

Local control chips perform self-conditioning of digital pulse waveforms by automatically adjusting amplitude, phase, and timing parameters based on real-time feedback from their associated quantum processing unit. This self-service capability eliminates the need for complex external conditioning equipment, as each chip adapts to its specific qubit's characteristics and maintains optimal control precision autonomously.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The local control chips are designed as universal multi-functional units that can condition signals for multiple different qubit types and perform various quantum operations. By integrating multiple functions (signal generation, conditioning, amplification, and feedback processing) into a single standardized chip architecture, the system reduces overall device complexity while maintaining high control precision across diverse quantum processing units.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260094039A1Quantum Computer Clusters for Large-Scale Applications

Publication Date: 2026.04.02 RIGETTI & CO INC

AI summary

In a general aspect, quantum computer clusters are configured for large-scale applications. In some implementations, a quantum computer cluster includes a global controller, a first quantum computer system including a first qubit device, and a second quantum computer system including a second qubit device. Each of the first and second quantum computer systems are communicably connected to the global controller. The first and second quantum computer systems include respective quantum processing units housed in distinct cryostats. Operating the global controller includes obtaining respective local frames from the first and second quantum computer systems; determining respective values of phase compensation for the quantum computer systems based on the respective local frames; transmitting the respective values of the phase compensation to the quantum computer systems; and causing the quantum computer systems to apply phase shifts to phases of control signals.