17-Evaluation Variational Bell State Preparation on IBM 156-qubit Heron Processor - A New Efficiency Benchmark for NISQ Hardware Article Swipe

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SoftQuantus innovative OÜ ·

YOU? · · 2025 · Open Access · · DOI: https://doi.org/10.5281/zenodo.17751871

We demonstrate the preparation of a maximally entangled Bell state (|Φ⁺⟩ = (|00⟩ + |11⟩)/√2) on IBM’s 156-qubit Heron r2 processor (ibm_fez) using a standard 8-parameter hardware-efficient ansatz and the QCOS Quantum Control OS Autopilot. The optimisation converged to a raw fidelity of 0.8496 after only 17 real hardware circuit evaluations (10k–20k shots each) and ~21 minutes wall-clock time, including queueing. The same code reaches 0.999512 fidelity on AerSimulator in 32 evaluations. To the best of our knowledge, this is the lowest number of real hardware evaluations ever publicly documented for variational preparation of a 2-qubit Bell state on NISQ hardware without heavy error mitigation. All job IDs, raw measurement counts, control parameters, and reproducible Python scripts are included. Keywords: quantum computing, NISQ, variational algorithms, Bell state, IBM Quantum, sample efficiency, quantum control

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Computer Science

Computer Hardware

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Quantum Computing

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Error Detection And Correction

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Computer science Python (programming language) Computer hardware Benchmark (surveying) IBM State (computer science) Quantum computer Cryptography Software Error detection and correction Ansatz Embedded system High fidelity Scripting language Computer engineering Parallel computing Fidelity Quantum teleportation Computation Video Graphics Array Computational science Bell state Checksum Operating system Finite-state machine Reconfigurable computing

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Landing Page: https://doi.org/10.5281/zenodo.17751871
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DOI: https://doi.org/10.5281/zenodo.17751871

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Title: 17-Evaluation Variational Bell State Preparation on IBM 156-qubit Heron Processor - A New Efficiency Benchmark for NISQ Hardware

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Publication year: 2025

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Concepts: Computer science, Python (programming language), Computer hardware, Benchmark (surveying), IBM, State (computer science), Quantum computer, Cryptography, Software, Error detection and correction, Ansatz, Embedded system, High fidelity, Scripting language, Computer engineering, Parallel computing, Fidelity, Quantum teleportation, Computation, Video Graphics Array, Computational science, Bell state, Checksum, Operating system, Finite-state machine, Reconfigurable computing

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