A high-efficiency plug-and-play superconducting qubit network

Abstract

Modular architectures are a promising approach to scale quantum devices to the point of fault tolerance and utility. Modularity is particularly appealing for superconducting qubits, as monolithically manufactured devices are limited in both system size and quality. Constructing complex quantum systems as networks of interchangeable modules can overcome this challenge through `Lego-like' assembly, reconfiguration, and expansion, in a spirit similar to modern classical computers. First prototypical superconducting quantum device networks have been demonstrated. Interfaces that simultaneously permit interchangeability and high-fidelity operations remain a crucial challenge, however. Here, we demonstrate a high-efficiency interconnect based on a detachable cable between superconducting qubit devices. We overcome the inevitable loss in a detachable connection through a fast pump scheme, enabling inter-module SWAP efficiencies at the 99%-level in less than 100 ns. We use this scheme to generate high-fidelity entanglement and operate a distributed logical dual-rail qubit. At the observed ~1% error rate, operations through the interconnect are at the threshold for fault-tolerance. These results introduce a modular architecture for scaling quantum processors with reconfigurable and expandable networks.

15 pages, 9 figures, 1 table

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Cited by in corpus (8)

• A thermal-noise-resilient microwave quantum network traversing 4 K
• Mitigating cosmic ray-like correlated events with a modular quantum processor
• Scalable Low-overhead Superconducting Non-local Coupler with Exponentially Enhanced Connectivity
• Tunable Hybrid-Mode Coupler Enabling Strong Interactions between Transmons at Centimeter-Scale Distance
• Loss-induced quantum nonreciprocity and entanglement in superconducting qubits
• Deterministic Quantum Communication Between Fixed-Frequency Superconducting Qubits via Broadband Resonators
• Autonomous stabilization of remote entanglement in a cascaded quantum network
• High-performance quantum interconnect between bosonic modules beyond transmission loss constraints