Superconducting Quantum Architectures With Photonic Interconnects
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Solution Overview
Problem
Current superconducting quantum hardware architectures are limited to less than 100 qubits and lack the scalability to support implementations involving thousands or millions of qubits, restricting the development of large-scale quantum computers due to limitations in qubit-qubit connectivity and single-chip scalability.
Innovation Solution
Implementing modular architectures with photonic interconnects that allow for qubits to be interconnected using microwave-optical transducers and optical networks, enabling communications between nonadjacent qubits across multiple chips in two- and three-dimensional configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If current superconducting quantum hardware architectures are used with qubit-qubit connectivity, then qubits can be coupled via electric circuits, but the system is limited to less than 100 qubits and lacks scalability
Solution Approach 1:
The quantum computing system is divided into multiple separate chips, each containing a subset of qubits. These chips are interconnected through photonic links rather than requiring all qubits to be on a single chip. This segmentation allows each chip to be managed independently while achieving system-scale connectivity through the photonic network, thereby enabling thousands or millions of qubits without proportionally increasing on-chip complexity.
Solution Approach 2:
Microwave-optical transducers serve as intermediary devices that convert microwave signals (used for qubit control) into optical signals (used for long-distance communication). These transducers enable qubits on different chips to communicate through photonic links, acting as a mediator between the quantum processing units and the communication network, thus facilitating scalable inter-chip connectivity.
2Ease of manufacture
If single-chip architectures are used, then qubit coupling is simplified, but scalability to thousands or millions of qubits is restricted
Solution Approach 1:
The architecture transitions from a two-dimensional planar layout on a single chip to a three-dimensional system where multiple chips are stacked or arranged in space and connected via photonic links. This dimensional transition allows the system to scale vertically and spatially rather than being constrained by the surface area of a single chip, enabling millions of qubits while maintaining manageable on-chip densities.
Solution Approach 2:
The patent replaces direct electrical coupling mechanisms (which are constrained by on-chip geometry and parasitic effects) with photonic coupling mechanisms. Optical signals can travel through fibers or waveguides with minimal loss and interference, enabling long-distance qubit-qubit interactions without the parasitic capacitance and inductance that limit electrical connections on large-scale integrated circuits.
3Adaptability or versatility
If photonic interconnects with microwave-optical transducers are implemented, then connectivity between nonadjacent qubits across multiple chips is enabled, but device complexity increases
Solution Approach 1:
The photonic interconnect system serves multiple functions: it enables long-distance qubit communication, provides routing capabilities for different qubit pairs, and allows for reconfigurable connectivity patterns. The same optical infrastructure can support various quantum algorithms and computational tasks by reconfiguring which qubits are connected, making the system universally applicable to different quantum computing workloads without requiring dedicated hardware for each connection pattern.
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
Facilitates the realization of SC quantum computers with millions of qubits, providing unprecedented computing power and scalability by allowing for higher connectivity and efficient execution of longer algorithms.
Implementation Method 1
a first microwave-optical transducer interconnected with a first qubit of the first plurality of interconnected qubits
Data Source
AI summary
Presented herein are techniques through which modular architectures and systems may be implemented for superconducting (SC) quantum processing elements or chips utilizing photonic interconnects. In one instance, an SC processing element is provided that includes a plurality of interconnected qubits, wherein a first qubit of the plurality of interconnected qubits is interconnected with a first microwave-optical transducer. In one instance, a system is provided that includes a first SC processing element comprising a first plurality of interconnected qubits, wherein a first microwave-optical transducer is interconnected with a first qubit of the first plurality of interconnected qubits; a second SC processing element comprising a second plurality of interconnected qubits, wherein a second microwave-optical transducer is interconnected with a first qubit of the second plurality of interconnected qubits; and an optical network interconnecting the first microwave-optical transducer and the second microwave-optical transducer.