Time-crystalline eigenstate order on a quantum processor.

Autor: Mi X; Google Research, Mountain View, CA, USA., Ippoliti M; Department of Physics, Stanford University, Stanford, CA, USA., Quintana C; Google Research, Mountain View, CA, USA., Greene A; Google Research, Mountain View, CA, USA., Chen Z; Google Research, Mountain View, CA, USA., Gross J; Google Research, Mountain View, CA, USA., Arute F; Google Research, Mountain View, CA, USA., Arya K; Google Research, Mountain View, CA, USA., Atalaya J; Google Research, Mountain View, CA, USA., Babbush R; Google Research, Mountain View, CA, USA., Bardin JC; Google Research, Mountain View, CA, USA.; Department of Electrical and Computer Engineering, University of Massachusetts, Amherst, MA, USA., Basso J; Google Research, Mountain View, CA, USA., Bengtsson A; Google Research, Mountain View, CA, USA., Bilmes A; Google Research, Mountain View, CA, USA., Bourassa A; Google Research, Mountain View, CA, USA.; Pritzker School of Molecular Engineering, University of Chicago, Chicago, IL, USA., Brill L; Google Research, Mountain View, CA, USA., Broughton M; Google Research, Mountain View, CA, USA., Buckley BB; Google Research, Mountain View, CA, USA., Buell DA; Google Research, Mountain View, CA, USA., Burkett B; Google Research, Mountain View, CA, USA., Bushnell N; Google Research, Mountain View, CA, USA., Chiaro B; Google Research, Mountain View, CA, USA., Collins R; Google Research, Mountain View, CA, USA., Courtney W; Google Research, Mountain View, CA, USA., Debroy D; Google Research, Mountain View, CA, USA., Demura S; Google Research, Mountain View, CA, USA., Derk AR; Google Research, Mountain View, CA, USA., Dunsworth A; Google Research, Mountain View, CA, USA., Eppens D; Google Research, Mountain View, CA, USA., Erickson C; Google Research, Mountain View, CA, USA., Farhi E; Google Research, Mountain View, CA, USA., Fowler AG; Google Research, Mountain View, CA, USA., Foxen B; Google Research, Mountain View, CA, USA., Gidney C; Google Research, Mountain View, CA, USA., Giustina M; Google Research, Mountain View, CA, USA., Harrigan MP; Google Research, Mountain View, CA, USA., Harrington SD; Google Research, Mountain View, CA, USA., Hilton J; Google Research, Mountain View, CA, USA., Ho A; Google Research, Mountain View, CA, USA., Hong S; Google Research, Mountain View, CA, USA., Huang T; Google Research, Mountain View, CA, USA., Huff A; Google Research, Mountain View, CA, USA., Huggins WJ; Google Research, Mountain View, CA, USA., Ioffe LB; Google Research, Mountain View, CA, USA., Isakov SV; Google Research, Mountain View, CA, USA., Iveland J; Google Research, Mountain View, CA, USA., Jeffrey E; Google Research, Mountain View, CA, USA., Jiang Z; Google Research, Mountain View, CA, USA., Jones C; Google Research, Mountain View, CA, USA., Kafri D; Google Research, Mountain View, CA, USA., Khattar T; Google Research, Mountain View, CA, USA., Kim S; Google Research, Mountain View, CA, USA., Kitaev A; Google Research, Mountain View, CA, USA., Klimov PV; Google Research, Mountain View, CA, USA., Korotkov AN; Google Research, Mountain View, CA, USA.; Department of Electrical and Computer Engineering, University of California, Riverside, CA, USA., Kostritsa F; Google Research, Mountain View, CA, USA., Landhuis D; Google Research, Mountain View, CA, USA., Laptev P; Google Research, Mountain View, CA, USA., Lee J; Google Research, Mountain View, CA, USA.; Department of Chemistry, Columbia University, New York, NY, USA., Lee K; Google Research, Mountain View, CA, USA., Locharla A; Google Research, Mountain View, CA, USA., Lucero E; Google Research, Mountain View, CA, USA., Martin O; Google Research, Mountain View, CA, USA., McClean JR; Google Research, Mountain View, CA, USA., McCourt T; Google Research, Mountain View, CA, USA., McEwen M; Google Research, Mountain View, CA, USA.; Department of Physics, University of California, Santa Barbara, CA, USA., Miao KC; Google Research, Mountain View, CA, USA., Mohseni M; Google Research, Mountain View, CA, USA., Montazeri S; Google Research, Mountain View, CA, USA., Mruczkiewicz W; Google Research, Mountain View, CA, USA., Naaman O; Google Research, Mountain View, CA, USA., Neeley M; Google Research, Mountain View, CA, USA., Neill C; Google Research, Mountain View, CA, USA., Newman M; Google Research, Mountain View, CA, USA., Niu MY; Google Research, Mountain View, CA, USA., O'Brien TE; Google Research, Mountain View, CA, USA., Opremcak A; Google Research, Mountain View, CA, USA., Ostby E; Google Research, Mountain View, CA, USA., Pato B; Google Research, Mountain View, CA, USA., Petukhov A; Google Research, Mountain View, CA, USA., Rubin NC; Google Research, Mountain View, CA, USA., Sank D; Google Research, Mountain View, CA, USA., Satzinger KJ; Google Research, Mountain View, CA, USA., Shvarts V; Google Research, Mountain View, CA, USA., Su Y; Google Research, Mountain View, CA, USA., Strain D; Google Research, Mountain View, CA, USA., Szalay M; Google Research, Mountain View, CA, USA., Trevithick MD; Google Research, Mountain View, CA, USA., Villalonga B; Google Research, Mountain View, CA, USA., White T; Google Research, Mountain View, CA, USA., Yao ZJ; Google Research, Mountain View, CA, USA., Yeh P; Google Research, Mountain View, CA, USA., Yoo J; Google Research, Mountain View, CA, USA., Zalcman A; Google Research, Mountain View, CA, USA., Neven H; Google Research, Mountain View, CA, USA., Boixo S; Google Research, Mountain View, CA, USA., Smelyanskiy V; Google Research, Mountain View, CA, USA., Megrant A; Google Research, Mountain View, CA, USA., Kelly J; Google Research, Mountain View, CA, USA., Chen Y; Google Research, Mountain View, CA, USA., Sondhi SL; Department of Physics, Princeton University, Princeton, NJ, USA.; Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford, UK., Moessner R; Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany., Kechedzhi K; Google Research, Mountain View, CA, USA., Khemani V; Department of Physics, Stanford University, Stanford, CA, USA. vkhemani@stanford.edu., Roushan P; Google Research, Mountain View, CA, USA. pedramr@google.com.
Jazyk: angličtina
Zdroj: Nature [Nature] 2022 Jan; Vol. 601 (7894), pp. 531-536. Date of Electronic Publication: 2021 Nov 30.
DOI: 10.1038/s41586-021-04257-w
Abstrakt: Quantum many-body systems display rich phase structure in their low-temperature equilibrium states 1 . However, much of nature is not in thermal equilibrium. Remarkably, it was recently predicted that out-of-equilibrium systems can exhibit novel dynamical phases 2-8 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 order 7,16,17 . 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 states 7,9,10 . 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.
(© 2021. The Author(s).)
Databáze: MEDLINE
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