 Time-crystalline eigenstate order on a quantum processorXiao Mi,
Matteo Ippoliti,
Chris Quintana,
Ami Greene,
Zijun Chen,
Jonathan Gross,
Frank Arute,
Kunal Arya,
Juan Atalaya,
Ryan Babbush,
Joseph C. Bardin,
Joao Basso,
Andreas Bengtsson,
Alexander Bilmes,
Alexandre Bourassa,
Leon Brill,
Michael Broughton,
Bob B. Buckley,
David A. Buell,
Brian Burkett,
Nicholas Bushnell,
Benjamin Chiaro,
Roberto Collins,
William Courtney,
Dripto Debroy,
Sean Demura,
Alan R. Derk,
Andrew Dunsworth,
Daniel Eppens,
Catherine Erickson,
Edward Farhi,
Austin G. Fowler,
Brooks Foxen,
Craig Gidney,
Marissa Giustina,
Matthew P. Harrigan,
Sean D. Harrington,
Jeremy Hilton,
Alan Ho,
Sabrina Hong,
Trent Huang,
Ashley Huff,
William J. Huggins,
L. B. Ioffe,
Sergei V. Isakov,
Justin Iveland,
Evan Jeffrey,
Zhang Jiang,
Cody Jones,
Dvir Kafri,
Tanuj Khattar,
Seon Kim,
Alexei Kitaev,
Paul V. Klimov,
Alexander N. Korotkov,
Fedor Kostritsa,
David Landhuis,
Pavel Laptev,
Joonho Lee,
Kenny Lee,
Aditya Locharla,
Erik Lucero,
Orion Martin,
Jarrod R. McClean,
Trevor McCourt,
Matt McEwen,
Kevin C. Miao,
Masoud Mohseni,
Shirin Montazeri,
Wojciech Mruczkiewicz,
Ofer Naaman,
Matthew Neeley,
Charles Neill,
Michael Newman,
Murphy Yuezhen Niu,
Thomas E. O’Brien,
Alex Opremcak,
Eric Ostby,
Balint Pato,
Andre Petukhov,
Nicholas C. Rubin,
Daniel Sank,
Kevin J. Satzinger,
Vladimir Shvarts,
Yuan Su,
Doug Strain,
Marco Szalay,
Matthew D. Trevithick,
Benjamin Villalonga,
Theodore White,
Z. Jamie Yao,
Ping Yeh,
Juhwan Yoo,
Adam Zalcman,
Hartmut Neven,
Sergio Boixo,
Vadim Smelyanskiy,
Anthony Megrant,
Julian Kelly,
Yu Chen,
S. L. Sondhi,
Roderich Moessner,
Kostyantyn Kechedzhi,
Vedika Khemani () and
Pedram Roushan ()
Nature, 2022, vol. 601, issue 7894, 531-536 Abstract: Abstract Quantum many-body systems display rich phase structure in their low-temperature equilibrium states1. However, much of nature is not in thermal equilibrium. Remarkably, it was recently predicted that out-of-equilibrium systems can exhibit novel dynamical phases2–8 that may otherwise be forbidden by equilibrium thermodynamics, a paradigmatic example being the discrete time crystal (DTC)7,9–15. Concretely, dynamical phases can be defined in periodically driven many-body-localized (MBL) systems via the concept of eigenstate order7,16,17. In eigenstate-ordered MBL phases, the entire many-body spectrum exhibits quantum correlations and long-range order, with characteristic signatures in late-time dynamics from all initial states. It is, however, challenging to experimentally distinguish such stable phases from transient phenomena, or from regimes in which the dynamics of a few select states can mask typical behaviour. Here we implement tunable controlled-phase (CPHASE) gates on an array of superconducting qubits to experimentally observe an MBL-DTC and demonstrate its characteristic spatiotemporal response for generic initial states7,9,10. Our work employs a time-reversal protocol to quantify the impact of external decoherence, and leverages quantum typicality to circumvent the exponential cost of densely sampling the eigenspectrum. Furthermore, we locate the phase transition out of the DTC with an experimental finite-size analysis. These results establish a scalable approach to studying non-equilibrium phases of matter on quantum processors. Date: 2022 Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:601:y:2022:i:7894:d:10.1038_s41586-021-04257-w Ordering information: This journal article can be ordered from DOI: 10.1038/s41586-021-04257-w Access Statistics for this article Nature is currently edited by Magdalena Skipper More articles in Nature from Nature |
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