IBM and Cisco [1]plan to link quantum computers over long distances by the early 2030s , "with the goal of demonstrating the concept is workable by the end of 2030," reports Reuters. "The move could pave the way for a quantum internet, though executives at the two companies cautioned that the networks would require technologies that do not currently exist and will have to be developed with the help of universities and federal laboratories." From the report:

> The challenge begins with a problem: Quantum computers like IBM's sit in massive cryogenic tanks that get so cold that atoms barely move. To get information out of them, IBM has to figure out how to transform information in stationary "qubits" -- the fundamental unit of information in a quantum computer -- into what Jay Gambetta, director of IBM Research and an IBM fellow, told Reuters are "flying" qubits that travel as microwaves.

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> But those flying microwave qubits will have to be turned into optical signals that can travel between Cisco switches on fiber-optic cables. The technology for that transformation -- called a microwave-optical transducer -- will have to be developed with the help of groups like the Superconducting Quantum Materials and Systems Center, led by the Fermi National Accelerator Laboratory near Chicago, among others. Along the way, Cisco and IBM will also publish open-source software to weave all the parts together.



[1] https://www.reuters.com/business/media-telecom/ibm-cisco-outline-plans-networks-quantum-computers-by-early-2030s-2025-11-20/