@misc{seifert_exploring_2023,
	title = {Exploring {Ququart} {Computation} on a {Transmon} using {Optimal} {Control}},
	url = {http://arxiv.org/abs/2304.11159},
	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.},
	urldate = {2023-04-24},
	publisher = {arXiv},
	author = {Seifert, Lennart Maximilian and Li, Ziqian and Roy, Tanay and Schuster, David I. and Chong, Frederic T. and Baker, Jonathan M.},
	month = apr,
	year = {2023},
	note = {arXiv:2304.11159 [quant-ph]},
	keywords = {Quantum Physics, notion, optimal control, qudit, ququart},
}

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