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  1. Article ; Online: Dynamics of magnetization at infinite temperature in a Heisenberg spin chain.

    Rosenberg, E / Andersen, T I / Samajdar, R / Petukhov, A / Hoke, J C / Abanin, D / Bengtsson, A / Drozdov, I K / Erickson, C / Klimov, P V / Mi, X / Morvan, A / Neeley, M / Neill, C / Acharya, R / Allen, R / Anderson, K / Ansmann, M / Arute, F /
    Arya, K / Asfaw, A / Atalaya, J / Bardin, J C / Bilmes, A / Bortoli, G / Bourassa, A / Bovaird, J / Brill, L / Broughton, M / Buckley, B B / Buell, D A / Burger, T / Burkett, B / Bushnell, N / Campero, J / Chang, H-S / Chen, Z / Chiaro, B / Chik, D / Cogan, J / Collins, R / Conner, P / Courtney, W / Crook, A L / Curtin, B / Debroy, D M / Barba, A Del Toro / Demura, S / Di Paolo, A / Dunsworth, A / Earle, C / Faoro, L / Farhi, E / Fatemi, R / Ferreira, V S / Burgos, L Flores / Forati, E / Fowler, A G / Foxen, B / Garcia, G / Genois, É / Giang, W / Gidney, C / Gilboa, D / Giustina, M / Gosula, R / Dau, A Grajales / Gross, J A / Habegger, S / Hamilton, M C / Hansen, M / Harrigan, M P / Harrington, S D / Heu, P / Hill, G / Hoffmann, M R / Hong, S / Huang, T / Huff, A / Huggins, W J / Ioffe, L B / Isakov, S V / Iveland, J / Jeffrey, E / Jiang, Z / Jones, C / Juhas, P / Kafri, D / Khattar, T / Khezri, M / Kieferová, M / Kim, S / Kitaev, A / Klots, A R / Korotkov, A N / Kostritsa, F / Kreikebaum, J M / Landhuis, D / Laptev, P / Lau, K-M / Laws, L / Lee, J / Lee, K W / Lensky, Y D / Lester, B J / Lill, A T / Liu, W / Locharla, A / Mandrà, S / Martin, O / Martin, S / McClean, J R / McEwen, M / Meeks, S / Miao, K C / Mieszala, A / Montazeri, S / Movassagh, R / Mruczkiewicz, W / Nersisyan, A / Newman, M / Ng, J H / Nguyen, A / Nguyen, M / Niu, M Y / O'Brien, T E / Omonije, S / Opremcak, A / Potter, R / Pryadko, L P / Quintana, C / Rhodes, D M / Rocque, C / Rubin, N C / Saei, N / Sank, D / Sankaragomathi, K / Satzinger, K J / Schurkus, H F / Schuster, C / Shearn, M J / Shorter, A / Shutty, N / Shvarts, V / Sivak, V / Skruzny, J / Smith, W Clarke / Somma, R D / Sterling, G / Strain, D / Szalay, M / Thor, D / Torres, A / Vidal, G / Villalonga, B / Heidweiller, C Vollgraff / White, T / Woo, B W K / Xing, C / Yao, Z Jamie / Yeh, P / Yoo, J / Young, G / Zalcman, A / Zhang, Y / Zhu, N / Zobrist, N / Neven, H / Babbush, R / Bacon, D / Boixo, S / Hilton, J / Lucero, E / Megrant, A / Kelly, J / Chen, Y / Smelyanskiy, V / Khemani, V / Gopalakrishnan, S / Prosen, T / Roushan, P

    Science (New York, N.Y.)

    2024  Volume 384, Issue 6691, Page(s) 48–53

    Abstract: Understanding universal aspects of quantum dynamics is an unresolved problem in statistical mechanics. In particular, the spin dynamics of the one-dimensional Heisenberg model were conjectured as to belong to the Kardar-Parisi-Zhang (KPZ) universality ... ...

    Abstract Understanding universal aspects of quantum dynamics is an unresolved problem in statistical mechanics. In particular, the spin dynamics of the one-dimensional Heisenberg model were conjectured as to belong to the Kardar-Parisi-Zhang (KPZ) universality class based on the scaling of the infinite-temperature spin-spin correlation function. In a chain of 46 superconducting qubits, we studied the probability distribution of the magnetization transferred across the chain's center, [Formula: see text]. The first two moments of [Formula: see text] show superdiffusive behavior, a hallmark of KPZ universality. However, the third and fourth moments ruled out the KPZ conjecture and allow for evaluating other theories. Our results highlight the importance of studying higher moments in determining dynamic universality classes and provide insights into universal behavior in quantum systems.
    Language English
    Publishing date 2024-04-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.adi7877
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Time-crystalline eigenstate order on a quantum processor.

    Mi, Xiao / Ippoliti, Matteo / Quintana, Chris / Greene, Ami / Chen, Zijun / Gross, Jonathan / Arute, Frank / Arya, Kunal / Atalaya, Juan / Babbush, Ryan / Bardin, Joseph C / Basso, Joao / Bengtsson, Andreas / Bilmes, Alexander / Bourassa, Alexandre / Brill, Leon / Broughton, Michael / Buckley, Bob B / Buell, David A /
    Burkett, Brian / Bushnell, Nicholas / Chiaro, Benjamin / Collins, Roberto / Courtney, William / Debroy, Dripto / Demura, Sean / Derk, Alan R / Dunsworth, Andrew / Eppens, Daniel / Erickson, Catherine / Farhi, Edward / Fowler, Austin G / Foxen, Brooks / Gidney, Craig / Giustina, Marissa / Harrigan, Matthew P / Harrington, Sean D / Hilton, Jeremy / Ho, Alan / Hong, Sabrina / Huang, Trent / Huff, Ashley / Huggins, William J / Ioffe, L B / Isakov, Sergei V / Iveland, Justin / Jeffrey, Evan / Jiang, Zhang / Jones, Cody / Kafri, Dvir / Khattar, Tanuj / Kim, Seon / Kitaev, Alexei / Klimov, Paul V / Korotkov, Alexander N / Kostritsa, Fedor / Landhuis, David / Laptev, Pavel / Lee, Joonho / Lee, Kenny / Locharla, Aditya / Lucero, Erik / Martin, Orion / McClean, Jarrod R / McCourt, Trevor / McEwen, Matt / Miao, Kevin C / Mohseni, Masoud / Montazeri, Shirin / Mruczkiewicz, Wojciech / Naaman, Ofer / Neeley, Matthew / Neill, Charles / Newman, Michael / Niu, Murphy Yuezhen / O'Brien, Thomas E / Opremcak, Alex / Ostby, Eric / Pato, Balint / Petukhov, Andre / Rubin, Nicholas C / Sank, Daniel / Satzinger, Kevin J / Shvarts, Vladimir / Su, Yuan / Strain, Doug / Szalay, Marco / Trevithick, Matthew D / Villalonga, Benjamin / White, Theodore / Yao, Z Jamie / Yeh, Ping / Yoo, Juhwan / Zalcman, Adam / Neven, Hartmut / Boixo, Sergio / Smelyanskiy, Vadim / Megrant, Anthony / Kelly, Julian / Chen, Yu / Sondhi, S L / Moessner, Roderich / Kechedzhi, Kostyantyn / Khemani, Vedika / Roushan, Pedram

    Nature

    2021  Volume 601, Issue 7894, Page(s) 531–536

    Abstract: Quantum many-body systems display rich phase structure in their low-temperature equilibrium ... ...

    Abstract Quantum many-body systems display rich phase structure in their low-temperature equilibrium states
    MeSH term(s) Cold Temperature ; Phase Transition ; Thermodynamics
    Language English
    Publishing date 2021-11-30
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-021-04257-w
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  3. Article ; Online: Information scrambling in quantum circuits.

    Mi, Xiao / Roushan, Pedram / Quintana, Chris / Mandrà, Salvatore / Marshall, Jeffrey / Neill, Charles / Arute, Frank / Arya, Kunal / Atalaya, Juan / Babbush, Ryan / Bardin, Joseph C / Barends, Rami / Basso, Joao / Bengtsson, Andreas / Boixo, Sergio / Bourassa, Alexandre / Broughton, Michael / Buckley, Bob B / Buell, David A /
    Burkett, Brian / Bushnell, Nicholas / Chen, Zijun / Chiaro, Benjamin / Collins, Roberto / Courtney, William / Demura, Sean / Derk, Alan R / Dunsworth, Andrew / Eppens, Daniel / Erickson, Catherine / Farhi, Edward / Fowler, Austin G / Foxen, Brooks / Gidney, Craig / Giustina, Marissa / Gross, Jonathan A / Harrigan, Matthew P / Harrington, Sean D / Hilton, Jeremy / Ho, Alan / Hong, Sabrina / Huang, Trent / Huggins, William J / Ioffe, L B / Isakov, Sergei V / Jeffrey, Evan / Jiang, Zhang / Jones, Cody / Kafri, Dvir / Kelly, Julian / Kim, Seon / Kitaev, Alexei / Klimov, Paul V / Korotkov, Alexander N / Kostritsa, Fedor / Landhuis, David / Laptev, Pavel / Lucero, Erik / Martin, Orion / McClean, Jarrod R / McCourt, Trevor / McEwen, Matt / Megrant, Anthony / Miao, Kevin C / Mohseni, Masoud / Montazeri, Shirin / Mruczkiewicz, Wojciech / Mutus, Josh / Naaman, Ofer / Neeley, Matthew / Newman, Michael / Niu, Murphy Yuezhen / O'Brien, Thomas E / Opremcak, Alex / Ostby, Eric / Pato, Balint / Petukhov, Andre / Redd, Nicholas / Rubin, Nicholas C / Sank, Daniel / Satzinger, Kevin J / Shvarts, Vladimir / Strain, Doug / Szalay, Marco / Trevithick, Matthew D / Villalonga, Benjamin / White, Theodore / Yao, Z Jamie / Yeh, Ping / Zalcman, Adam / Neven, Hartmut / Aleiner, Igor / Kechedzhi, Kostyantyn / Smelyanskiy, Vadim / Chen, Yu

    Science (New York, N.Y.)

    2021  Volume 374, Issue 6574, Page(s) 1479–1483

    Abstract: Interactions in quantum systems can spread initially localized quantum information into the exponentially many degrees of freedom of the entire system. Understanding this process, known as quantum scrambling, is key to resolving several open questions in ...

    Abstract Interactions in quantum systems can spread initially localized quantum information into the exponentially many degrees of freedom of the entire system. Understanding this process, known as quantum scrambling, is key to resolving several open questions in physics. Here, by measuring the time-dependent evolution and fluctuation of out-of-time-order correlators, we experimentally investigate the dynamics of quantum scrambling on a 53-qubit quantum processor. We engineer quantum circuits that distinguish operator spreading and operator entanglement and experimentally observe their respective signatures. We show that whereas operator spreading is captured by an efficient classical model, operator entanglement in idealized circuits requires exponentially scaled computational resources to simulate. These results open the path to studying complex and practically relevant physical observables with near-term quantum processors.
    Language English
    Publishing date 2021-10-28
    Publishing country United States
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 128410-1
    ISSN 1095-9203 ; 0036-8075
    ISSN (online) 1095-9203
    ISSN 0036-8075
    DOI 10.1126/science.abg5029
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Quantum supremacy using a programmable superconducting processor.

    Arute, Frank / Arya, Kunal / Babbush, Ryan / Bacon, Dave / Bardin, Joseph C / Barends, Rami / Biswas, Rupak / Boixo, Sergio / Brandao, Fernando G S L / Buell, David A / Burkett, Brian / Chen, Yu / Chen, Zijun / Chiaro, Ben / Collins, Roberto / Courtney, William / Dunsworth, Andrew / Farhi, Edward / Foxen, Brooks /
    Fowler, Austin / Gidney, Craig / Giustina, Marissa / Graff, Rob / Guerin, Keith / Habegger, Steve / Harrigan, Matthew P / Hartmann, Michael J / Ho, Alan / Hoffmann, Markus / Huang, Trent / Humble, Travis S / Isakov, Sergei V / Jeffrey, Evan / Jiang, Zhang / Kafri, Dvir / Kechedzhi, Kostyantyn / Kelly, Julian / Klimov, Paul V / Knysh, Sergey / Korotkov, Alexander / Kostritsa, Fedor / Landhuis, David / Lindmark, Mike / Lucero, Erik / Lyakh, Dmitry / Mandrà, Salvatore / McClean, Jarrod R / McEwen, Matthew / Megrant, Anthony / Mi, Xiao / Michielsen, Kristel / Mohseni, Masoud / Mutus, Josh / Naaman, Ofer / Neeley, Matthew / Neill, Charles / Niu, Murphy Yuezhen / Ostby, Eric / Petukhov, Andre / Platt, John C / Quintana, Chris / Rieffel, Eleanor G / Roushan, Pedram / Rubin, Nicholas C / Sank, Daniel / Satzinger, Kevin J / Smelyanskiy, Vadim / Sung, Kevin J / Trevithick, Matthew D / Vainsencher, Amit / Villalonga, Benjamin / White, Theodore / Yao, Z Jamie / Yeh, Ping / Zalcman, Adam / Neven, Hartmut / Martinis, John M

    Nature

    2019  Volume 574, Issue 7779, Page(s) 505–510

    Abstract: The promise of quantum computers is that certain computational tasks might be executed exponentially faster on a quantum processor than on a classical ... ...

    Abstract The promise of quantum computers is that certain computational tasks might be executed exponentially faster on a quantum processor than on a classical processor
    Language English
    Publishing date 2019-10-23
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-019-1666-5
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  5. Book ; Online: Observation of Time-Crystalline Eigenstate Order on a Quantum Processor

    Mi, Xiao / Ippoliti, Matteo / Quintana, Chris / Greene, Ami / Chen, Zijun / Gross, Jonathan / Arute, Frank / Arya, Kunal / Atalaya, Juan / Babbush, Ryan / Bardin, Joseph C. / Basso, Joao / Bengtsson, Andreas / Bilmes, Alexander / Bourassa, Alexandre / Brill, Leon / Broughton, Michael / Buckley, Bob B. / Buell, David A. /
    Burkett, Brian / Bushnell, Nicholas / Chiaro, Benjamin / Collins, Roberto / Courtney, William / Debroy, Dripto / Demura, Sean / Derk, Alan R. / Dunsworth, Andrew / Eppens, Daniel / Erickson, Catherine / Farhi, Edward / Fowler, Austin G. / Foxen, Brooks / Gidney, Craig / Giustina, Marissa / Harrigan, Matthew P. / Harrington, Sean D. / Hilton, Jeremy / Ho, Alan / Hong, Sabrina / Huang, Trent / Huff, Ashley / Huggins, William J. / Ioffe, L. B. / Isakov, Sergei V. / Iveland, Justin / Jeffrey, Evan / Jiang, Zhang / Jones, Cody / Kafri, Dvir / Khattar, Tanuj / Kim, Seon / Kitaev, Alexei / Klimov, Paul V. / Korotkov, Alexander N. / Kostritsa, Fedor / Landhuis, David / Laptev, Pavel / Lee, Joonho / Lee, Kenny / Locharla, Aditya / Lucero, Erik / Martin, Orion / McClean, Jarrod R. / McCourt, Trevor / McEwen, Matt / Miao, Kevin C. / Mohseni, Masoud / Montazeri, Shirin / Mruczkiewicz, Wojciech / Naaman, Ofer / Neeley, Matthew / Neill, Charles / Newman, Michael / Niu, Murphy Yuezhen / Brien, Thomas E. O\' / Opremcak, Alex / Ostby, Eric / Pato, Balint / Petukhov, Andre / Rubin, Nicholas C. / Sank, Daniel / Satzinger, Kevin J. / Shvarts, Vladimir / Su, Yuan / Strain, Doug / Szalay, Marco / Trevithick, Matthew D. / Villalonga, Benjamin / White, Theodore / Yao, Z. Jamie / Yeh, Ping / Yoo, Juhwan / Zalcman, Adam / Neven, Hartmut / Boixo, Sergio / Smelyanskiy, Vadim / Megrant, Anthony / Kelly, Julian / Chen, Yu / Sondhi, S. L. / Moessner, Roderich / Kechedzhi, Kostyantyn / Khemani, Vedika / Roushan, Pedram

    2021  

    Abstract: Quantum many-body systems display rich phase structure in their low-temperature equilibrium states. However, much of nature is not in thermal equilibrium. Remarkably, it was recently predicted that out-of-equilibrium systems can exhibit novel dynamical ... ...

    Abstract Quantum many-body systems display rich phase structure in their low-temperature equilibrium states. However, much of nature is not in thermal equilibrium. Remarkably, it was recently predicted that out-of-equilibrium systems can exhibit novel dynamical phases that may otherwise be forbidden by equilibrium thermodynamics, a paradigmatic example being the discrete time crystal (DTC). Concretely, dynamical phases can be defined in periodically driven many-body localized systems via the concept of eigenstate order. In eigenstate-ordered 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, wherein few select states can mask typical behavior. Here we implement a continuous family of tunable CPHASE gates on an array of superconducting qubits to experimentally observe an eigenstate-ordered DTC. We demonstrate the characteristic spatiotemporal response of a DTC for generic initial states. Our work employs a time-reversal protocol that discriminates external decoherence from intrinsic thermalization, and leverages quantum typicality to circumvent the exponential cost of densely sampling the eigenspectrum. In addition, we locate the phase transition out of the DTC with an experimental finite-size analysis. These results establish a scalable approach to study non-equilibrium phases of matter on current quantum processors.
    Keywords Quantum Physics ; Condensed Matter - Disordered Systems and Neural Networks ; Condensed Matter - Statistical Mechanics ; Condensed Matter - Strongly Correlated Electrons
    Subject code 612
    Publishing date 2021-07-28
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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