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Classiq has developed a hardware-aware scheduling method that reorders neutral-atom quantum circuits to minimize CZ-depth, which is the critical metric for performance in this architecture rather than total gate count. By strategically swapping adjacent entangling layers, this approach reduces the duration qubits spend in excited Rydberg states, thereby lowering decoherence rates and improving computational fidelity. This optimization directly addresses the primary error source in neutral-atom systems where two-qubit errors scale with the number of sequential laser pulses.

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Classiq and QuEra Reduce CZ-Depth for Neutral-Atom Processors

Quantum ZeitgeistOctober 13, 20265 min read

Working with QuEra, Classiq optimized circuits for neutral-atom processors, significantly reducing CZ-depth—the number of sequential laser pulses needed.

The critical measure of performance for neutral-atom quantum processors is not the total number of gates, but the number of sequential laser operations, known as CZ-depth, required to execute a circuit. Working with QuEra, Classiq has developed a hardware-aware scheduling capability that reorders circuits to minimize these layers, directly impacting accumulated error, a key challenge in these platforms where “dominant two-qubit errors scale primarily with the number of entangling layers rather than the number of gates within a layer.” Physical qubits in this system are encoded in hyperfine ground states…

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