Operating two exchange-only qubits in parallel

• URL: http://arxiv.org/abs/2504.01191v1
• Date: Tue, 01 Apr 2025 21:12:31 GMT
• Title: Operating two exchange-only qubits in parallel
• Authors: Mateusz T. Mądzik, Florian Luthi, Gian Giacomo Guerreschi, Fahd A. Mohiyaddin, Felix Borjans, Jason D. Chadwick, Matthew J. Curry, Joshua Ziegler, Sarah Atanasov, Peter L. Bavdaz, Elliot J. Connors, J. Corrigan, H. Ekmel Ercan, Robert Flory, Hubert C. George, Benjamin Harpt, Eric Henry, Mohammad M. Islam, Nader Khammassi, Daniel Keith, Lester F. Lampert, Todor M. Mladenov, Randy W. Morris, Aditi Nethwewala, Samuel Neyens, René Otten, Linda P. Osuna Ibarra, Bishnu Patra, Ravi Pillarisetty, Shavindra Premaratne, Mick Ramsey, Andrew Risinger, John Rooney, Rostyslav Savytskyy, Thomas F. Watson, Otto K. Zietz, Anne Y. Matsuura, Stefano Pellerano, Nathaniel C. Bishop, Jeanette Roberts, James S. Clarke,
• Abstract summary: We show the parallel operation of two exchange-only qubits, consisting of six quantum dots in a linear arrangement.<n>We also show the first experimental demonstrations of an iSWAP gate and of a charge-locking Pauli spin blockade readout method.
• Score: 0.5543326375790769
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Semiconductors are among the most promising platforms to implement large-scale quantum computers, as advanced manufacturing techniques allow fabrication of large quantum dot arrays. Various qubit encodings can be used to store and manipulate quantum information on these quantum dot arrays. Regardless of qubit encoding, precise control over the exchange interaction between electrons confined in quantum dots in the array is critical. Furthermore, it is necessary to execute high-fidelity quantum operations concurrently to make full use of the limited coherence of individual qubits. Here, we demonstrate the parallel operation of two exchange-only qubits, consisting of six quantum dots in a linear arrangement. Using randomized benchmarking techniques, we show that issuing pulses on the five barrier gates to modulate exchange interactions in a maximally parallel way maintains the quality of qubit control relative to sequential operation. The techniques developed to perform parallel exchange pulses can be readily adapted to other quantum-dot based encodings. Moreover, we show the first experimental demonstrations of an iSWAP gate and of a charge-locking Pauli spin blockade readout method. The results are validated using cross-entropy benchmarking, a technique useful for performance characterization of larger quantum computing systems; here it is used for the first time on a quantum system based on semiconductor technology.

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