Benchmarking on IBM heavy-hex processors shows WS-QAOA incurs catastrophic decoherence from nonlocal gates while HE-VQNN preserves coherence but lacks expressibility for CVaR tail correlations, exposing NISQ connectivity limits for dense financial optimization.
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Benchmarking Quantum Algorithmic Resilience for CVaR Portfolio Optimization: The Expressibility-Coherence Trade-off
Benchmarking on IBM heavy-hex processors shows WS-QAOA incurs catastrophic decoherence from nonlocal gates while HE-VQNN preserves coherence but lacks expressibility for CVaR tail correlations, exposing NISQ connectivity limits for dense financial optimization.