Collective preparation of large quantum registers with high fidelity

2024/06/24 by Lorenzo Buffoni, Michele Campisi, Buffoni, Lorenzo +1 · 1 citation
Computer Science · Engineering · #Advancements in Semiconductor Devices and Circuit Design #FOS: Physical sciences #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Physics (quant-ph) #Statistical Mechanics (cond-mat.stat-mech)

paper · pdf · doi:10.48550/arxiv.2406.16706

openalex publication_date 2024/06/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We report on the preparation of a large quantum register of 5612 qubits, with the unprecedented high global fidelity of F≃ 0.9956. This was achieved by applying an improved cooperative quantum information erasure (CQIE) protocol [Buffoni, L. and Campisi, M., Quantum 7, 961 (2023)] to a programmable network of superconducting qubits featuring a high connectivity. At variance with the standard method based on the individual reset of each qubit in parallel, here the quantum register is treated as a whole, thus avoiding the well-known orthogonality catastrophe wehereby even an extremely high individual reset fidelity f results in vanishing global fidelities F=f^N with growing number N of qubits.

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