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Sharing entanglement across quantum interconnects is fundamental for quantum information processing. We discuss a practical setting where this interconnect, modeled by a quantum channel, is used once with the aim of sharing high-fidelity entanglement. For any channel, we provide methods to easily find both this maximum fidelity and optimal inputs that achieve it. Unlike most metrics for sharing entanglement, this maximum fidelity can be shown to be multiplicative.
The quantum device used in our experiment consists of five superconducting transmon qubits, A, D , …, D , and seven microwave resonators (Fig. 1c). Five of the resonators are used for individual control and readout of the qubits, to which they are dispersively coupled.13 The center qubit A plays the role of the result and is coupled to the data register {D } via the remaining two resonators.
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