High-Coherence Fluxonium Qubit

Nguyen, Long B.; Lin, Yen-Hsiang; Somoroff, Aaron; Mencia, Raymond; Grabon, Nicholas; Manucharyan, Vladimir

doi:10.1103/physrevx.9.041041

Cited by 234 publications

(195 citation statements)

References 70 publications

(98 reference statements)

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“…or interactions [20] occur in one-dimensional (1D) BECs. BECs also develop spin [21] or density wave patterns [22] by quenches of atomic interaction.…”

mentioning

confidence: 99%

Pattern formation in a driven Bose–Einstein condensate

et al. 2020

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Pattern formation is ubiquitous in nature from morphogenesis and cloud formation to galaxy filamentation. More often than not, patterns arise in a medium driven far from equilibrium due to the interplay of dynamical instability and nonlinear wave mixing. We report, based on momentum and real space pattern recognition, formation of density patterns with two-(D2), four-(D4) and six-fold (D6) symmetries in Bose-Einstein condensates (BECs) with atomic interactions driven at two frequencies. The symmetry of the pattern is controlled by the ratio of the frequencies. The D6 density waves, in particular, arise from a resonant wave mixing process that coherently correlates and enhances the excitations that respect the symmetry. arXiv:1909.05536v1 [cond-mat.quant-gas]

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“…or interactions [20] occur in one-dimensional (1D) BECs. BECs also develop spin [21] or density wave patterns [22] by quenches of atomic interaction.…”

mentioning

confidence: 99%

Pattern formation in a driven Bose–Einstein condensate

et al. 2020

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“…As detailed in Supplementary Note 6 , the T 1 of the qubit can limit its noise sensitivity. However, as T 1 is improved through a combination of qubit design 47 and advanced materials 48 , the sensitivity and utility of our approach also improves. Using diagnostic techniques such as the QNS protocol developed here to identify and characterize noise sources is an important step towards mitigating and eliminating them.…”

Section: Discussionmentioning

confidence: 99%

“…While we employ a flux-tunable transmon as a multi-level noise sensor, our methodology is portable to other anharmonic multi-level systems, such as the C-shunt flux qubit 30 and the fluxonium 46 , 47 . Since the sensitivity of the qubit energies to various noise sources differ by qubit design, employing other superconducting qubits as multi-level noise sensors will enable us to explore various noise sources.…”

Section: Discussionmentioning

confidence: 99%

Multi-level quantum noise spectroscopy

et al. 2021

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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.

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“…As pointed out by many works since the seminal work by the Yale group, [1,2] the largest coupling to the circuit resonator is achieved via inductive coupling. [93,[110][111][112] The long superconducting arm making the twisted boundary condition may lead to an ultra-strong coupling regime or even beyond for the topological QED system.…”

Section: Coupling Schemesmentioning

confidence: 99%

Exotic Quantum States of Circuit Quantum Electrodynamics in the Ultra‐Strong Coupling Regime

Choi

2020

Adv Quantum Tech

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The quantum coherent behaviors of superconducting devices at macroscopic scales and recent technical advances in fine tunability have brought the conventional cavity quantum electrodynamics (QED) to superconducting circuits. With an ultra-strong cavity photon-artificial atom coupling and the inherent nonlinearity of the Josephson junctions, the so-called circuit QED offers new opportunities to explore new realms of physics that have remained a challenge for conventional cavity QED. Circuit QED has even attracted public attention as the leading architecture for quantum computation. In this article, a pedagogical review of recent studies and activities on exotic quantum states that can be attributed to ultra-strong coupling is provided. A progress report on attempts to seek the smallest unit of the topological matter and its fundamental interaction with light is also provided.

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High-Coherence Fluxonium Qubit

Cited by 234 publications

References 70 publications

Pattern formation in a driven Bose–Einstein condensate

Pattern formation in a driven Bose–Einstein condensate

Multi-level quantum noise spectroscopy

Exotic Quantum States of Circuit Quantum Electrodynamics in the Ultra‐Strong Coupling Regime

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