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  1. Article ; Online: Sequential Dispersive Measurement of a Superconducting Qubit.

    Peronnin, T / Marković, D / Ficheux, Q / Huard, B

    Physical review letters

    2020  Volume 124, Issue 18, Page(s) 180502

    Abstract: We present a superconducting device that realizes the sequential measurement of a transmon qubit. The device disables common limitations of dispersive readout such as Purcell effect or transients in the cavity mode by turning on and off the coupling to ... ...

    Abstract We present a superconducting device that realizes the sequential measurement of a transmon qubit. The device disables common limitations of dispersive readout such as Purcell effect or transients in the cavity mode by turning on and off the coupling to the measurement channel on demand. The qubit measurement begins by loading a readout resonator that is coupled to the qubit. After an optimal interaction time with negligible loss, a microwave pump releases the content of the readout mode by upconversion into a measurement line in a characteristic time as low as 10 ns, which is 400 times shorter than the lifetime of the readout resonator. A direct measurement of the released field quadratures demonstrates a readout fidelity of 97.5% in a total measurement time of 220 ns. The Wigner tomography of the readout mode allows us to characterize the non-Gaussian nature of the readout mode and its dynamics.
    Language English
    Publishing date 2020-05-22
    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.124.180502
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Millisecond Coherence in a Superconducting Qubit.

    Somoroff, Aaron / Ficheux, Quentin / Mencia, Raymond A / Xiong, Haonan / Kuzmin, Roman / Manucharyan, Vladimir E

    Physical review letters

    2023  Volume 130, Issue 26, Page(s) 267001

    Abstract: Improving control over physical qubits is a crucial component of quantum computing research. Here we report a superconducting fluxonium qubit with uncorrected coherence time T_{2}^{*}=1.48±0.13  ms, exceeding the state of the art for transmons by an ... ...

    Abstract Improving control over physical qubits is a crucial component of quantum computing research. Here we report a superconducting fluxonium qubit with uncorrected coherence time T_{2}^{*}=1.48±0.13  ms, exceeding the state of the art for transmons by an order of magnitude. The average gate fidelity was benchmarked at 0.99991(1). Notably, even in the millisecond range, the coherence time is limited by material absorption and could be further improved with a more rigorous fabrication. Our demonstration may be useful for suppressing errors in the next generation quantum processors.
    MeSH term(s) Computing Methodologies ; Quantum Theory
    Language English
    Publishing date 2023-01-09
    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.130.267001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Author Correction: Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing.

    Ficheux, Q / Jezouin, S / Leghtas, Z / Huard, B

    Nature communications

    2018  Volume 9, Issue 1, Page(s) 2814

    Abstract: The original version of this Article omitted the following from the Acknowledgements: Z. Leghtas' primary affiliation is Centre Automatique et Systèmes, Mines ParisTech. This has been corrected in both the PDF and HTML versions of the Article. ...

    Abstract The original version of this Article omitted the following from the Acknowledgements: Z. Leghtas' primary affiliation is Centre Automatique et Systèmes, Mines ParisTech. This has been corrected in both the PDF and HTML versions of the Article.
    Language English
    Publishing date 2018-07-13
    Publishing country England
    Document type Journal Article ; Published Erratum
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-018-05207-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing.

    Ficheux, Q / Jezouin, S / Leghtas, Z / Huard, B

    Nature communications

    2018  Volume 9, Issue 1, Page(s) 1926

    Abstract: Decoherence originates from the leakage of quantum information into external degrees of freedom. For a qubit, the two main decoherence channels are relaxation and dephasing. Here, we report an experiment on a superconducting qubit where we retrieve part ... ...

    Abstract Decoherence originates from the leakage of quantum information into external degrees of freedom. For a qubit, the two main decoherence channels are relaxation and dephasing. Here, we report an experiment on a superconducting qubit where we retrieve part of the lost information in both of these channels. We demonstrate that raw averaging the corresponding measurement records provides a full quantum tomography of the qubit state where all three components of the effective spin-1/2 are simultaneously measured. From single realizations of the experiment, it is possible to infer the quantum trajectories followed by the qubit state conditioned on relaxation and/or dephasing channels. The incompatibility between these quantum measurements of the qubit leads to observable consequences in the statistics of quantum states. The high level of controllability of superconducting circuits enables us to explore many regimes from the Zeno effect to underdamped Rabi oscillations depending on the relative strengths of driving, dephasing, and relaxation.
    Language English
    Publishing date 2018-05-15
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-018-04372-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing

    Q. Ficheux / S. Jezouin / Z. Leghtas / B. Huard

    Nature Communications, Vol 9, Iss 1, Pp 1-

    2018  Volume 6

    Abstract: ... recorded then it can be used to infer the quantum state. Ficheux et al. monitor the relaxation and ...

    Abstract Information leaked by a quantum system into its environment causes decoherence but if it is recorded then it can be used to infer the quantum state. Ficheux et al. monitor the relaxation and dephasing of a qubit and show that this allows all three components of the qubit to be probed simultaneously.
    Keywords Science ; Q
    Language English
    Publishing date 2018-05-01T00:00:00Z
    Publisher Nature Publishing Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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  6. Article ; Online: Author Correction

    Q. Ficheux / S. Jezouin / Z. Leghtas / B. Huard

    Nature Communications, Vol 9, Iss 1, Pp 1-

    Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing

    2018  Volume 1

    Abstract: The original version of this Article omitted the following from the Acknowledgements: Z. Leghtas' primary affiliation is Centre Automatique et Systèmes, Mines ParisTech. This has been corrected in both the PDF and HTML versions of the Article. ...

    Abstract The original version of this Article omitted the following from the Acknowledgements: Z. Leghtas' primary affiliation is Centre Automatique et Systèmes, Mines ParisTech. This has been corrected in both the PDF and HTML versions of the Article.
    Keywords Science ; Q
    Language English
    Publishing date 2018-07-01T00:00:00Z
    Publisher Nature Publishing Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

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  7. Article ; Online: Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing

    Q. Ficheux / S. Jezouin / Z. Leghtas / B. Huard

    Nature Communications, Vol 9, Iss 1, Pp 1-

    2018  Volume 6

    Abstract: ... recorded then it can be used to infer the quantum state. Ficheux et al. monitor the relaxation and ...

    Abstract Information leaked by a quantum system into its environment causes decoherence but if it is recorded then it can be used to infer the quantum state. Ficheux et al. monitor the relaxation and dephasing of a qubit and show that this allows all three components of the qubit to be probed simultaneously.
    Keywords Science ; Q
    Language English
    Publishing date 2018-05-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  8. Article ; Online: Author Correction

    Q. Ficheux / S. Jezouin / Z. Leghtas / B. Huard

    Nature Communications, Vol 9, Iss 1, Pp 1-

    Dynamics of a qubit while simultaneously monitoring its relaxation and dephasing

    2018  Volume 1

    Abstract: The original version of this Article omitted the following from the Acknowledgements: Z. Leghtas' primary affiliation is Centre Automatique et Systèmes, Mines ParisTech. This has been corrected in both the PDF and HTML versions of the Article. ...

    Abstract The original version of this Article omitted the following from the Acknowledgements: Z. Leghtas' primary affiliation is Centre Automatique et Systèmes, Mines ParisTech. This has been corrected in both the PDF and HTML versions of the Article.
    Keywords Science ; Q
    Language English
    Publishing date 2018-07-01T00:00:00Z
    Publisher Nature Portfolio
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

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  9. Article ; Online: Energetics of a Single Qubit Gate.

    Stevens, J / Szombati, D / Maffei, M / Elouard, C / Assouly, R / Cottet, N / Dassonneville, R / Ficheux, Q / Zeppetzauer, S / Bienfait, A / Jordan, A N / Auffèves, A / Huard, B

    Physical review letters

    2022  Volume 129, Issue 11, Page(s) 110601

    Abstract: Qubits are physical, a quantum gate thus not only acts on the information carried by the qubit but also on its energy. What is then the corresponding flow of energy between the qubit and the controller that implements the gate? Here we exploit a ... ...

    Abstract Qubits are physical, a quantum gate thus not only acts on the information carried by the qubit but also on its energy. What is then the corresponding flow of energy between the qubit and the controller that implements the gate? Here we exploit a superconducting platform to answer this question in the case of a quantum gate realized by a resonant drive field. During the gate, the superconducting qubit becomes entangled with the microwave drive pulse so that there is a quantum superposition between energy flows. We measure the energy change in the drive field conditioned on the outcome of a projective qubit measurement. We demonstrate that the drive's energy change associated with the measurement backaction can exceed by far the energy that can be extracted by the qubit. This can be understood by considering the qubit as a weak measurement apparatus of the driving field.
    Language English
    Publishing date 2022-09-26
    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.129.110601
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Demonstration of an Effective Ultrastrong Coupling between Two Oscillators.

    Marković, D / Jezouin, S / Ficheux, Q / Fedortchenko, S / Felicetti, S / Coudreau, T / Milman, P / Leghtas, Z / Huard, B

    Physical review letters

    2018  Volume 121, Issue 4, Page(s) 40505

    Abstract: When the coupling rate between two quantum systems becomes as large as their characteristic frequencies, it induces dramatic effects on their dynamics and even on the nature of their ground state. The case of a qubit coupled to a harmonic oscillator in ... ...

    Abstract When the coupling rate between two quantum systems becomes as large as their characteristic frequencies, it induces dramatic effects on their dynamics and even on the nature of their ground state. The case of a qubit coupled to a harmonic oscillator in this ultrastrong coupling regime has been investigated theoretically and experimentally. Here, we explore the case of two harmonic oscillators in the ultrastrong coupling regime. Probing the properties of their ground state remains out of reach in natural implementations. Therefore, we have realized an analog quantum simulation of this coupled system by dual frequency pumping a nonlinear superconducting circuit. The pump amplitudes directly tune the effective coupling rate. We observe spectroscopic signature of a mode hybridization that is characteristic of the ultrastrong coupling. We experimentally demonstrate a key property of the ground state of this simulated ultrastrong coupling between modes by observing simultaneous single- and two-mode squeezing of the radiated field below vacuum fluctuations.
    Language English
    Publishing date 2018-07-27
    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.121.040505
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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