Demonstrating a Long-Coherence Dual-Rail Erasure Qubit Using Tunable Transmons

H. Levine, A. Haim, J. S.C. Hung, N. Alidoust, M. Kalaee, L. Delorenzo, E. A. Wollack, P. Arrangoiz-Arriola, A. Khalajhedayati, R. Sanil, H. Moradinejad, Y. Vaknin, A. Kubica, D. Hover, S. Aghaeimeibodi, J. A. Alcid, C. Baek, J. Barnett, K. Bawdekar, P. BieniasH. A. Carson, C. Chen, L. Chen, H. Chinkezian, E. M. Chisholm, A. Clifford, R. Cosmic, N. Crisosto, A. M. Dalzell, E. Davis, J. M. D'ewart, S. Diez, N. D'souza, P. T. Dumitrescu, E. Elkhouly, M. T. Fang, Y. Fang, S. Flammia, M. J. Fling, G. Garcia, M. K. Gharzai, A. V. Gorshkov, M. J. Gray, S. Grimberg, A. L. Grimsmo, C. T. Hann, Y. He, S. Heidel, S. Howell, M. Hunt, J. Iverson, I. Jarrige, L. Jiang, W. M. Jones, R. Karabalin, P. J. Karalekas, A. J. Keller, D. Lasi, M. Lee, V. Ly, G. Maccabe, N. Mahuli, G. Marcaud, M. H. Matheny, S. Mcardle, G. Mccabe, G. Merton, C. Miles, A. Milsted, A. Mishra, L. Moncelsi, M. Naghiloo, K. Noh, E. Oblepias, G. Ortuno, J. C. Owens, J. Pagdilao, A. Panduro, J. P. Paquette, R. N. Patel, G. Peairs, D. J. Perello, E. C. Peterson, S. Ponte, H. Putterman, G. Refael, P. Reinhold, R. Resnick, O. A. Reyna, R. Rodriguez, J. Rose, A. H. Rubin, M. Runyan, C. A. Ryan, A. Sahmoud, T. Scaffidi, B. Shah, S. Siavoshi, P. Sivarajah, T. Skogland, C. J. Su, L. J. Swenson, J. Sylvia, S. M. Teo, A. Tomada, G. Torlai, M. Wistrom, K. Zhang, I. Zuk, A. A. Clerk, F. G.S.L. Brandão, A. Retzker, O. Painter*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Quantum error correction with erasure qubits promises significant advantages over standard error correction due to favorable thresholds for erasure errors. To realize this advantage in practice requires a qubit for which nearly all errors are such erasure errors, and the ability to check for erasure errors without dephasing the qubit. We demonstrate that a "dual-rail qubit"consisting of a pair of resonantly coupled transmons can form a highly coherent erasure qubit, where transmon T1 errors are converted into erasure errors and residual dephasing is strongly suppressed, leading to millisecond-scale coherence within the qubit subspace. We show that single-qubit gates are limited primarily by erasure errors, with erasure probability perasure=2.19(2)×10-3 per gate while the residual errors are ∼40 times lower. We further demonstrate midcircuit detection of erasure errors while introducing <0.1% dephasing error per check. Finally, we show that the suppression of transmon noise allows this dual-rail qubit to preserve high coherence over a broad tunable operating range, offering an improved capacity to avoid frequency collisions. This work establishes transmon-based dual-rail qubits as an attractive building block for hardware-efficient quantum error correction.

Original languageAmerican English
Article number011051
JournalPhysical Review X
Issue number1
StatePublished - Jan 2024

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© 2024 authors. Published by the American Physical Society.


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