Modular Quantum Computing Optical Interconnects for Remote Entanglement
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Solution Overview
Problem
Scaling quantum computing systems based on atomic qubits faces challenges in maintaining performance and gate fidelities as the size of quantum processing units (QPUs) increases, particularly due to technological overheads and limited connectivity between qubits.
Innovation Solution
Implementing a modular approach using optical interconnects to connect smaller QPUs, enabling remote entanglement through high numerical aperture optical access that allows for individual addressing, spatially resolved qubit readout, and fluorescent collection, while utilizing a single viewport for operations like readout, addressing, and interconnect, and employing switches to separate and route beams effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If QPU size is increased to improve computing power, then processing capability is improved, but gate fidelities and performance deteriorate due to technological overheads and limited connectivity
Solution Approach 1:
The patent divides a large QPU into multiple smaller QPUs, each maintaining high gate fidelities. These modular QPUs are connected through optical interconnects, allowing the system to achieve high computing power while preserving the reliability benefits of smaller, manageable units. The segmentation enables independent optimization of each module while scaling overall capacity.
Solution Approach 2:
The patent introduces optical interconnects as intermediary components between separate QPUs. These interconnects use high numerical aperture optical access to enable remote entanglement and communication between qubits in different QPU modules, effectively extending connectivity without compromising gate fidelities within each module.
2Device complexity
If multiple beams (readout, interconnect, addressing) share the same optical path to simplify the system, then device complexity is reduced, but beam separation and routing become difficult
Solution Approach 1:
The patent employs a single viewport that serves multiple functions: readout, addressing, and interconnect operations all occur through the same optical access point. This universal interface simplifies the overall device complexity by eliminating the need for separate viewports or optical access points for each function.
Solution Approach 2:
The patent extracts and separates different beam types (readout, interconnect, addressing) using optical switching components after they pass through the shared viewport. This extraction allows each beam type to be routed to its specific destination, making beam separation and routing manageable despite the shared initial path.
3Ease of manufacture
If a single viewport is used for readout, addressing, and interconnect operations to reduce device complexity, then manufacturing is simplified, but optical access for individual qubit operations becomes limited
Solution Approach 1:
The patent uses dynamic optical switching to enable a single static viewport to provide dynamic optical access to different qubits and functional units. The optical switches can redirect beams to different destinations based on operational requirements, effectively providing adaptable optical access through a fixed physical interface.
Solution Approach 2:
The patent introduces optical switches as intermediary components between the single viewport and the various qubit operations. These switches act as mediators that route optical signals to the appropriate qubits or functional units, maintaining manufacturing simplicity while achieving versatile optical access capabilities.
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
This approach enables efficient scaling of quantum computing systems by maintaining high gate fidelities and performance, allowing for flexible connectivity between QPUs and facilitating remote entanglement across distant qubits, thereby overcoming the limitations of traditional QPU scaling.
Implementation Method 1
fluorescent collection
Implementation Method 2
high numerical aperture optical access that allows for individual addressing, spatially resolved qubit readout, and fluorescent collection
Data Source
AI summary
Aspects of the present disclosure relate generally to systems and methods for use in the implementation and/or operation of quantum information processing (QIP) systems, and more particularly, to systems and methods for receiving a readout beam associated with a state of a first qubit of an array of trapped ions, receiving an interconnect beam configured entangle a second qubit of the array with an external qubit of an external array, receiving an addressing beam, from an addressing unit, configured to control a state of a third qubit of the array, guiding, via at least one switch, the addressing beam from the addressing unit toward the third qubit, guiding, via the at least one switch, the readout beam toward a photodetector, and guiding, via the at least one switch, the interconnect beam toward an interconnect unit optically coupled with the external array.