Quantum computers have an isolation problem and DARPA wants to solve it

"The idea is that there are multiple types of quantum computers that rely on different qubit technologies such as superconducting qubits or photonic qubits. Quantum computers can also have different types of processors and different quantum models. Building large quantum computers with more than 1,000 logical qubits is prohibitively expensive. Relying on a homogeneous qubit infrastructure limits the types of problems a quantum computer can work on, according to solicitation documents."

"Each style of quantum computer has strengths and weaknesses. Superconducting qubits are fast but noisy in one example, while trapped ion qubits are more accurate but slower in another. DARPA's goal is to find ways for them to work together and leverage the different strengths and compensate for the limitations. The solicitation compares it to how today's IT infrastructure works:"

DARPA is seeking companies to build hardware and software that enable different quantum computers to interconnect and operate together. Most quantum systems are standalone and current teleportation-based links introduce errors and limitations. Multiple qubit technologies—superconducting, photonic, trapped ion—offer differing speed, noise, and accuracy trade-offs. Building monolithic systems beyond 1,000 logical qubits is prohibitively expensive. DARPA aims to enable heterogeneous quantum architectures that combine complementary strengths, optimize resource allocation across interfaces, and create hardware links and software layers to move quantum data and orchestrate multi-platform quantum computation.

Read at Nextgov.com