![]() In this tech report, we discuss the considerations needed when choosing the architecture for a quantum computer. Based on lessons learned from earlier systems, the heavy-hex topology represents a slight reduction in qubit connectivity from previous generation systems, but, crucially, minimizes both qubit frequency collisions and spectator qubit errors that are detrimental to real-world quantum application performance. The heavy-hex topology is a product of co-design between experiment, theory, and applications, that is scalable and offers reduced error-rates while affording the opportunity to explore error correcting codes. Each unit cell of the lattice consists of a hexagonal arrangement of qubits, with an additional qubit on each edge. The heavy-hex lattice represents the fourth iteration of the topology for IBM Quantum systems and is the basis for the Falcon and Hummingbird quantum processor architectures. ![]() As of August 8, 2021, the topology of all active IBM Quantum devices will be based around the heavy-hex lattice.
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