What question did this study set out to answer?

This research aims to analyze the coherence decay of GHZ, W, and product states in IBM Heron quantum processors under varying noise conditions.

January 20, 2026Open Access

Comparative Coherence Decay of GHZ, W, and Product States Under Idle Noise in IBM Heron Quantum Processors: Extended Analysis with Dynamical Decoupling

Key Points

This research aims to analyze the coherence decay of GHZ, W, and product states in IBM Heron quantum processors under varying noise conditions.
Experimental comparison of coherence decay across three IBM Heron quantum processors (r1, r2, r3)
Testing dynamical decoupling protocols with virtual Z-pulses (DD-Z) and physical X-pulses (DD-X)
Configuration involved 3-5 qubits with 4000 shots and delays ranging from 0-100,000 dt
GHZ states decay 2.4–13.8× slower than product states across processors
DD-Z shows a marginal improvement in coherence by +0.6% while DD-X degrades coherence by -24.4%
W-state performance is superior on architectures r1 and r3 but inferior on r2
Weak non-Markovian noise signatures were observed at a 5 µs delay window

Abstract

Version 2. 1: Extended experimental analysis comparing coherence decay of GHZ, W, and product states on IBM Heron quantum processors (r1, r2, r3). Key findings: - GHZ states decay 2. 4–13. 8× slower than product states across three processor generations- Dynamical decoupling with virtual Z-pulses (DD-Z) provides marginal improvement (+0. 6%), while physical X-pulses (DD-X) degrade coherence by -24. 4%- W-state performance is architecture-dependent: superior on r1/r3, inferior on r2- Weak non-Markovian noise signatures detected at 5 µs delay window This version extends v1. 0 (DOI: 10. 5281/zenodo. 18274447) with W-state analysis, comprehensive DD protocol testing, and the DD-Z vs DD-X discovery. Backends: ibmₜorino (r1), ibmfez (r2), ibmboston (r3) Configuration: 3-5 qubits, 4000 shots, delays 0-100, 000 dt

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Cite This Study

Arturo Cerezo (Sat,) studied this question.

synapsesocial.com/papers/696f1a629e64f732b51ee9ab https://doi.org/https://doi.org/10.5281/zenodo.18284373

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