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  1. Book ; Online: Quantum simulation experiments with superconducting circuits

    Braumüller, Jochen

    2018  

    Abstract: While the universal quantum computer seems not in reach for the near future, this work focusses on analog quantum simulation of intriguing quantum models of light-matter interactions, with the goal of achieving a computational speed-up as compared to ... ...

    Abstract While the universal quantum computer seems not in reach for the near future, this work focusses on analog quantum simulation of intriguing quantum models of light-matter interactions, with the goal of achieving a computational speed-up as compared to classical hardware. Existing building blocks of quantum hardware are used from superconducting circuits, that have proven to be a very suitable experimental platform for the implementation of model Hamiltonians at a high degree of controllability
    Keywords Physics
    Size 1 electronic resource (III, 149 p. p.)
    Publisher KIT Scientific Publishing
    Publishing place Verlagsort nicht ermittelbar
    Document type Book ; Online
    Note ENGLISH ; Open Access
    HBZ-ID HT020196283
    ISBN 9783731507802 ; 3731507803
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Article ; Online: Improving qubit coherence using closed-loop feedback.

    Vepsäläinen, Antti / Winik, Roni / Karamlou, Amir H / Braumüller, Jochen / Paolo, Agustin Di / Sung, Youngkyu / Kannan, Bharath / Kjaergaard, Morten / Kim, David K / Melville, Alexander J / Niedzielski, Bethany M / Yoder, Jonilyn L / Gustavsson, Simon / Oliver, William D

    Nature communications

    2022  Volume 13, Issue 1, Page(s) 1932

    Abstract: Superconducting qubits are a promising platform for building a larger-scale quantum processor capable of solving otherwise intractable problems. In order for the processor to reach practical viability, the gate errors need to be further suppressed and ... ...

    Abstract Superconducting qubits are a promising platform for building a larger-scale quantum processor capable of solving otherwise intractable problems. In order for the processor to reach practical viability, the gate errors need to be further suppressed and remain stable for extended periods of time. With recent advances in qubit control, both single- and two-qubit gate fidelities are now in many cases limited by the coherence times of the qubits. Here we experimentally employ closed-loop feedback to stabilize the frequency fluctuations of a superconducting transmon qubit, thereby increasing its coherence time by 26% and reducing the single-qubit error rate from (8.5 ± 2.1) × 10
    Language English
    Publishing date 2022-04-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-022-29287-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Evolution of 1/f Flux Noise in Superconducting Qubits with Weak Magnetic Fields.

    Rower, David A / Ateshian, Lamia / Li, Lauren H / Hays, Max / Bluvstein, Dolev / Ding, Leon / Kannan, Bharath / Almanakly, Aziza / Braumüller, Jochen / Kim, David K / Melville, Alexander / Niedzielski, Bethany M / Schwartz, Mollie E / Yoder, Jonilyn L / Orlando, Terry P / Wang, Joel I-Jan / Gustavsson, Simon / Grover, Jeffrey A / Serniak, Kyle /
    Comin, Riccardo / Oliver, William D

    Physical review letters

    2023  Volume 130, Issue 22, Page(s) 220602

    Abstract: The microscopic description of 1/f magnetic flux noise in superconducting circuits has remained an open question for several decades despite extensive experimental and theoretical investigation. Recent progress in superconducting devices for quantum ... ...

    Abstract The microscopic description of 1/f magnetic flux noise in superconducting circuits has remained an open question for several decades despite extensive experimental and theoretical investigation. Recent progress in superconducting devices for quantum information has highlighted the need to mitigate sources of qubit decoherence, driving a renewed interest in understanding the underlying noise mechanism(s). Though a consensus has emerged attributing flux noise to surface spins, their identity and interaction mechanisms remain unclear, prompting further study. Here, we apply weak in-plane magnetic fields to a capacitively shunted flux qubit (where the Zeeman splitting of surface spins lies below the device temperature) and study the flux-noise-limited qubit dephasing, revealing previously unexplored trends that may shed light on the dynamics behind the emergent 1/f noise. Notably, we observe an enhancement (suppression) of the spin-echo (Ramsey) pure-dephasing time in fields up to B=100  G. With direct noise spectroscopy, we further observe a transition from a 1/f to approximately Lorentzian frequency dependence below 10 Hz and a reduction of the noise above 1 MHz with increasing magnetic field. We suggest that these trends are qualitatively consistent with an increase of spin cluster sizes with magnetic field. These results should help to inform a complete microscopic theory of 1/f flux noise in superconducting circuits.
    MeSH term(s) Magnetic Fields ; Temperature
    Language English
    Publishing date 2023-06-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.130.220602
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  4. Book ; Online: Realizing the two-dimensional hard-core Bose-Hubbard model with superconducting qubits

    Yanay, Yariv / Braumüller, Jochen / Gustavsson, Simon / Oliver, William D. / Tahan, Charles

    2019  

    Abstract: The pursuit of superconducting-based quantum computers has advanced the fabrication of and experimentation with custom lattices of qubits and resonators. Here, we describe a roadmap to use present experimental capabilities to simulate an interacting many- ...

    Abstract The pursuit of superconducting-based quantum computers has advanced the fabrication of and experimentation with custom lattices of qubits and resonators. Here, we describe a roadmap to use present experimental capabilities to simulate an interacting many-body system of bosons and measure quantities that are exponentially difficult to calculate numerically. We focus on the two-dimensional hard-core Bose-Hubbard model implemented as an array of floating transmon qubits. We describe a control scheme for such a lattice that can perform individual qubit readout and show how the scheme enables the preparation of a highly-excited many-body state, in contrast with atomic implementations restricted to the ground state or thermal equilibrium. We discuss what observables could be accessed and how they could be used to better understand the properties of many-body systems, including the observation of the transition of eigenstate entanglement entropy scaling from area law behavior to volume law behavior

    Comment: 14 pages, 8 figures
    Keywords Quantum Physics
    Subject code 612
    Publishing date 2019-10-02
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Multi-level quantum noise spectroscopy.

    Sung, Youngkyu / Vepsäläinen, Antti / Braumüller, Jochen / Yan, Fei / Wang, Joel I-Jan / Kjaergaard, Morten / Winik, Roni / Krantz, Philip / Bengtsson, Andreas / Melville, Alexander J / Niedzielski, Bethany M / Schwartz, Mollie E / Kim, David K / Yoder, Jonilyn L / Orlando, Terry P / Gustavsson, Simon / Oliver, William D

    Nature communications

    2021  Volume 12, Issue 1, Page(s) 967

    Abstract: System noise identification is crucial to the engineering of robust quantum systems. Although existing quantum noise spectroscopy (QNS) protocols measure an aggregate amount of noise affecting a quantum system, they generally cannot distinguish between ... ...

    Abstract System noise identification is crucial to the engineering of robust quantum systems. Although existing quantum noise spectroscopy (QNS) protocols measure an aggregate amount of noise affecting a quantum system, they generally cannot distinguish between the underlying processes that contribute to it. Here, we propose and experimentally validate a spin-locking-based QNS protocol that exploits the multi-level energy structure of a superconducting qubit to achieve two notable advances. First, our protocol extends the spectral range of weakly anharmonic qubit spectrometers beyond the present limitations set by their lack of strong anharmonicity. Second, the additional information gained from probing the higher-excited levels enables us to identify and distinguish contributions from different underlying noise mechanisms.
    Language English
    Publishing date 2021-02-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-021-21098-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Hexagonal boron nitride as a low-loss dielectric for superconducting quantum circuits and qubits.

    Wang, Joel I-J / Yamoah, Megan A / Li, Qing / Karamlou, Amir H / Dinh, Thao / Kannan, Bharath / Braumüller, Jochen / Kim, David / Melville, Alexander J / Muschinske, Sarah E / Niedzielski, Bethany M / Serniak, Kyle / Sung, Youngkyu / Winik, Roni / Yoder, Jonilyn L / Schwartz, Mollie E / Watanabe, Kenji / Taniguchi, Takashi / Orlando, Terry P /
    Gustavsson, Simon / Jarillo-Herrero, Pablo / Oliver, William D

    Nature materials

    2022  Volume 21, Issue 4, Page(s) 398–403

    Abstract: Dielectrics with low loss at microwave frequencies are imperative for high-coherence solid-state quantum computing platforms. Here we study the dielectric loss of hexagonal boron nitride (hBN) thin films in the microwave regime by measuring the quality ... ...

    Abstract Dielectrics with low loss at microwave frequencies are imperative for high-coherence solid-state quantum computing platforms. Here we study the dielectric loss of hexagonal boron nitride (hBN) thin films in the microwave regime by measuring the quality factor of parallel-plate capacitors (PPCs) made of NbSe
    Language English
    Publishing date 2022-01-27
    Publishing country England
    Document type Journal Article
    ZDB-ID 2088679-2
    ISSN 1476-4660 ; 1476-1122
    ISSN (online) 1476-4660
    ISSN 1476-1122
    DOI 10.1038/s41563-021-01187-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Analog quantum simulation of the Rabi model in the ultra-strong coupling regime.

    Braumüller, Jochen / Marthaler, Michael / Schneider, Andre / Stehli, Alexander / Rotzinger, Hannes / Weides, Martin / Ustinov, Alexey V

    Nature communications

    2017  Volume 8, Issue 1, Page(s) 779

    Abstract: The quantum Rabi model describes the fundamental mechanism of light-matter interaction. It consists of a two-level atom or qubit coupled to a quantized harmonic mode via a transversal interaction. In the weak coupling regime, it reduces to the well-known ...

    Abstract The quantum Rabi model describes the fundamental mechanism of light-matter interaction. It consists of a two-level atom or qubit coupled to a quantized harmonic mode via a transversal interaction. In the weak coupling regime, it reduces to the well-known Jaynes-Cummings model by applying a rotating wave approximation. The rotating wave approximation breaks down in the ultra-strong coupling regime, where the effective coupling strength g is comparable to the energy ω of the bosonic mode, and remarkable features in the system dynamics are revealed. Here we demonstrate an analog quantum simulation of an effective quantum Rabi model in the ultra-strong coupling regime, achieving a relative coupling ratio of g/ω ~ 0.6. The quantum hardware of the simulator is a superconducting circuit embedded in a cQED setup. We observe fast and periodic quantum state collapses and revivals of the initial qubit state, being the most distinct signature of the synthesized model.An analog quantum simulation scheme has been explored with a quantum hardware based on a superconducting circuit. Here the authors investigate the time evolution of the quantum Rabi model at ultra-strong coupling conditions, which is synthesized by slowing down the system dynamics in an effective frame.
    Language English
    Publishing date 2017-10-03
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/s41467-017-00894-w
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Book ; Online: Improving qubit coherence using closed-loop feedback

    Vepsäläinen, Antti / Winik, Roni / Karamlou, Amir H. / Braumüller, Jochen / Di Paolo, Agustin / Sung, Youngkyu / Kannan, Bharath / Kjaergaard, Morten / Kim, David K. / Melville, Alexander J. / Niedzielski, Bethany M. / Yoder, Jonilyn L. / Gustavsson, Simon / Oliver, William D.

    2021  

    Abstract: Superconducting qubits are a promising platform for building a larger-scale quantum processor capable of solving otherwise intractable problems. In order for the processor to reach practical viability, the gate errors need to be further suppressed and ... ...

    Abstract Superconducting qubits are a promising platform for building a larger-scale quantum processor capable of solving otherwise intractable problems. In order for the processor to reach practical viability, the gate errors need to be further suppressed and remain stable for extended periods of time. With recent advances in qubit control, both single- and two-qubit gate fidelities are now in many cases limited by the coherence times of the qubits. Here we experimentally employ closed-loop feedback to stabilize the frequency fluctuations of a superconducting transmon qubit, thereby increasing its coherence time by 26\% and reducing the single-qubit error rate from $(8.5 \pm 2.1)\times 10^{-4}$ to $(5.9 \pm 0.7)\times 10^{-4}$. Importantly, the resulting high-fidelity operation remains effective even away from the qubit flux-noise insensitive point, significantly increasing the frequency bandwidth over which the qubit can be operated with high fidelity. This approach is helpful in large qubit grids, where frequency crowding and parasitic interactions between the qubits limit their performance.

    Comment: 15 pages, 7 figures
    Keywords Quantum Physics
    Subject code 612
    Publishing date 2021-05-03
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Waveguide quantum electrodynamics with superconducting artificial giant atoms.

    Kannan, Bharath / Ruckriegel, Max J / Campbell, Daniel L / Frisk Kockum, Anton / Braumüller, Jochen / Kim, David K / Kjaergaard, Morten / Krantz, Philip / Melville, Alexander / Niedzielski, Bethany M / Vepsäläinen, Antti / Winik, Roni / Yoder, Jonilyn L / Nori, Franco / Orlando, Terry P / Gustavsson, Simon / Oliver, William D

    Nature

    2020  Volume 583, Issue 7818, Page(s) 775–779

    Abstract: Models of light-matter interactions in quantum electrodynamics typically invoke the dipole ... ...

    Abstract Models of light-matter interactions in quantum electrodynamics typically invoke the dipole approximation
    Language English
    Publishing date 2020-07-29
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, Non-U.S. Gov't
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-020-2529-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 26: Show issues Location:
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  10. Book ; Online: Microwave Package Design for Superconducting Quantum Processors

    Huang, Sihao / Lienhard, Benjamin / Calusine, Greg / Vepsäläinen, Antti / Braumüller, Jochen / Kim, David K. / Melville, Alexander J. / Niedzielski, Bethany M. / Yoder, Jonilyn L. / Kannan, Bharath / Orlando, Terry P. / Gustavsson, Simon / Oliver, William D.

    2020  

    Abstract: Solid-state qubits with transition frequencies in the microwave regime, such as superconducting qubits, are at the forefront of quantum information processing. However, high-fidelity, simultaneous control of superconducting qubits at even a moderate ... ...

    Abstract Solid-state qubits with transition frequencies in the microwave regime, such as superconducting qubits, are at the forefront of quantum information processing. However, high-fidelity, simultaneous control of superconducting qubits at even a moderate scale remains a challenge, partly due to the complexities of packaging these devices. Here, we present an approach to microwave package design focusing on material choices, signal line engineering, and spurious mode suppression. We describe design guidelines validated using simulations and measurements used to develop a 24-port microwave package. Analyzing the qubit environment reveals no spurious modes up to 11GHz. The material and geometric design choices enable the package to support qubits with lifetimes exceeding 350 {\mu}s. The microwave package design guidelines presented here address many issues relevant for near-term quantum processors.

    Comment: 14 pages, 7 figures
    Keywords Quantum Physics
    Subject code 621
    Publishing date 2020-12-02
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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