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Quantum Physics

arXiv:2304.11159 (quant-ph)
[Submitted on 21 Apr 2023]

Title:Exploring Ququart Computation on a Transmon using Optimal Control

Authors:Lennart Maximilian Seifert, Ziqian Li, Tanay Roy, David I. Schuster, Frederic T. Chong, Jonathan M. Baker
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Abstract:Contemporary quantum computers encode and process quantum information in binary qubits (d = 2). However, many architectures include higher energy levels that are left as unused computational resources. We demonstrate a superconducting ququart (d = 4) processor and combine quantum optimal control with efficient gate decompositions to implement high-fidelity ququart gates. We distinguish between viewing the ququart as a generalized four-level qubit and an encoded pair of qubits, and characterize the resulting gates in each case. In randomized benchmarking experiments we observe gate fidelities greater 95% and identify coherence as the primary limiting factor. Our results validate ququarts as a viable tool for quantum information processing.
Subjects: Quantum Physics (quant-ph)
Cite as: arXiv:2304.11159 [quant-ph]
  (or arXiv:2304.11159v1 [quant-ph] for this version)
  https://doi.org/10.48550/arXiv.2304.11159
Related DOI: https://doi.org/10.1103/PhysRevA.108.062609

Submission history

From: Lennart Maximilian Seifert [view email]
[v1] Fri, 21 Apr 2023 17:58:48 UTC (2,871 KB)
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