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Decoherence of a tunable capacitively shunted flux qubit

Fuente: arXiv

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Détails bibliographiques
Auteurs principaux:	Trappen, R., Dai, X., Yurtalan, M. A., Melanson, D., Tennant, D. M., Martinez, A. J., Tang, Y., Gibson, J., Grover, J. A., Disseler, S. M., Basham, J. I., Das, R., Kim, D. K., Melville, A. J., Niedzielski, B. M., Hirjibehedin, C. F., Serniak, K., Weber, S. J., Yoder, J. L., Oliver, W. D., Lidar, D. A., Lupascu, A.
Format:	Preprint
Publié:	2023
Sujets:	Quantum Physics
Accès en ligne:	Acceder al recurso
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_version_	1866911316165263360
author	Trappen, R. Dai, X. Yurtalan, M. A. Melanson, D. Tennant, D. M. Martinez, A. J. Tang, Y. Gibson, J. Grover, J. A. Disseler, S. M. Basham, J. I. Das, R. Kim, D. K. Melville, A. J. Niedzielski, B. M. Hirjibehedin, C. F. Serniak, K. Weber, S. J. Yoder, J. L. Oliver, W. D. Lidar, D. A. Lupascu, A.
author_facet	Trappen, R. Dai, X. Yurtalan, M. A. Melanson, D. Tennant, D. M. Martinez, A. J. Tang, Y. Gibson, J. Grover, J. A. Disseler, S. M. Basham, J. I. Das, R. Kim, D. K. Melville, A. J. Niedzielski, B. M. Hirjibehedin, C. F. Serniak, K. Weber, S. J. Yoder, J. L. Oliver, W. D. Lidar, D. A. Lupascu, A.
contents	Quantum annealing is a method to solve optimization problems that leverages quantum tunneling in a coupled qubit system. We present a detailed study of the coherence of a tunable capacitively-shunted flux qubit, designed for coherent quantum annealing applications. We find that for high qubit frequencies, thermal noise in the bias line makes a significant contribution to the relaxation, arising from the design choice to experimentally explore both fast annealing and high-frequency control. The measured dephasing rate is primarily due to intrinsic low-frequency flux noise in the two qubit loops, with additional contribution from the low-frequency noise of control electronics used for fast annealing. Our results characterize decoherence in a realistic setup for quantum annealing and are relevant for ongoing efforts toward building superconducting quantum annealers with increased coherence.
format	Preprint
id	arxiv_https___arxiv_org_abs_2307_13961
institution	arXiv
publishDate	2023
record_format	arxiv
spellingShingle	Decoherence of a tunable capacitively shunted flux qubit Trappen, R. Dai, X. Yurtalan, M. A. Melanson, D. Tennant, D. M. Martinez, A. J. Tang, Y. Gibson, J. Grover, J. A. Disseler, S. M. Basham, J. I. Das, R. Kim, D. K. Melville, A. J. Niedzielski, B. M. Hirjibehedin, C. F. Serniak, K. Weber, S. J. Yoder, J. L. Oliver, W. D. Lidar, D. A. Lupascu, A. Quantum Physics Quantum annealing is a method to solve optimization problems that leverages quantum tunneling in a coupled qubit system. We present a detailed study of the coherence of a tunable capacitively-shunted flux qubit, designed for coherent quantum annealing applications. We find that for high qubit frequencies, thermal noise in the bias line makes a significant contribution to the relaxation, arising from the design choice to experimentally explore both fast annealing and high-frequency control. The measured dephasing rate is primarily due to intrinsic low-frequency flux noise in the two qubit loops, with additional contribution from the low-frequency noise of control electronics used for fast annealing. Our results characterize decoherence in a realistic setup for quantum annealing and are relevant for ongoing efforts toward building superconducting quantum annealers with increased coherence.
title	Decoherence of a tunable capacitively shunted flux qubit
topic	Quantum Physics
url	https://arxiv.org/abs/2307.13961