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Verified quantum information scrambling.

Publication ,  Journal Article
Landsman, KA; Figgatt, C; Schuster, T; Linke, NM; Yoshida, B; Yao, NY; Monroe, C
Published in: Nature
March 2019

Quantum scrambling is the dispersal of local information into many-body quantum entanglements and correlations distributed throughout an entire system. This concept accompanies the dynamics of thermalization in closed quantum systems, and has recently emerged as a powerful tool for characterizing chaos in black holes1-4. However, the direct experimental measurement of quantum scrambling is difficult, owing to the exponential complexity of ergodic many-body entangled states. One way to characterize quantum scrambling is to measure an out-of-time-ordered correlation function (OTOC); however, because scrambling leads to their decay, OTOCs do not generally discriminate between quantum scrambling and ordinary decoherence. Here we implement a quantum circuit that provides a positive test for the scrambling features of a given unitary process5,6. This approach conditionally teleports a quantum state through the circuit, providing an unambiguous test for whether scrambling has occurred, while simultaneously measuring an OTOC. We engineer quantum scrambling processes through a tunable three-qubit unitary operation as part of a seven-qubit circuit on an ion trap quantum computer. Measured teleportation fidelities are typically about 80 per cent, and enable us to experimentally bound the scrambling-induced decay of the corresponding OTOC measurement.

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Published In

Nature

DOI

EISSN

1476-4687

ISSN

0028-0836

Publication Date

March 2019

Volume

567

Issue

7746

Start / End Page

61 / 65

Related Subject Headings

  • General Science & Technology
 

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Landsman, K. A., Figgatt, C., Schuster, T., Linke, N. M., Yoshida, B., Yao, N. Y., & Monroe, C. (2019). Verified quantum information scrambling. Nature, 567(7746), 61–65. https://doi.org/10.1038/s41586-019-0952-6
Landsman, K. A., C. Figgatt, T. Schuster, N. M. Linke, B. Yoshida, N. Y. Yao, and C. Monroe. “Verified quantum information scrambling.Nature 567, no. 7746 (March 2019): 61–65. https://doi.org/10.1038/s41586-019-0952-6.
Landsman KA, Figgatt C, Schuster T, Linke NM, Yoshida B, Yao NY, et al. Verified quantum information scrambling. Nature. 2019 Mar;567(7746):61–5.
Landsman, K. A., et al. “Verified quantum information scrambling.Nature, vol. 567, no. 7746, Mar. 2019, pp. 61–65. Epmc, doi:10.1038/s41586-019-0952-6.
Landsman KA, Figgatt C, Schuster T, Linke NM, Yoshida B, Yao NY, Monroe C. Verified quantum information scrambling. Nature. 2019 Mar;567(7746):61–65.
Journal cover image

Published In

Nature

DOI

EISSN

1476-4687

ISSN

0028-0836

Publication Date

March 2019

Volume

567

Issue

7746

Start / End Page

61 / 65

Related Subject Headings

  • General Science & Technology