Abstract
Superconducting circuits are a strong contender for realizing quantum computing systems and are also successfully used to study quantum optics and hybrid quantum systems. However, their cryogenic operation temperatures and the current lack of coherence-preserving microwave-to-optical conversion solutions have hindered the realization of superconducting quantum networks spanning different cryogenic systems or larger distances. Here, we report the successful operation of a cryogenic waveguide coherently linking transmon qubits located in two dilution refrigerators separated by a physical distance of five meters. We transfer qubit states and generate entanglement on demand with average transfer and target state fidelities of 85.8% and 79.5%, respectively, between the two nodes of this elementary network. Cryogenic microwave links provide an opportunity to scale up systems for quantum computing and create local area superconducting quantum communication networks over length scales of at least tens of meters.
- Received 7 August 2020
- Accepted 16 November 2020
DOI:https://doi.org/10.1103/PhysRevLett.125.260502
© 2020 American Physical Society
Physics Subject Headings (PhySH)
synopsis
Connecting Qubits via a Cryogenic Link
Published 21 December 2020
A cold waveguide provides a reliable conduit for transferring states between remote qubits, making it potentially useful for building networks connecting superconducting circuits.
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