Signal amplification in a qubit-resonator system

Karpov, D. S.; Oelsner, G.; Shevchenko, S. N.; Greenberg, Ya. S.; Il’ichev, É. A.

doi:10.1063/1.4942759

Cited by 9 publications

(3 citation statements)

References 43 publications

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“…The purpose is to highlight the diverse spectrum structures obtained under similar power levels (dBm), for both the resonator and qubit. The variations observed in the Hamiltonian spectra emphasize the sensitivity of the quantum system to frequency differences and offer valuable insights into the intricate dynamics of qubit-resonator interactions One crucial factor affecting the quality of spectroscopy data is the variation in parameters, such as the signal power on the qubit and resonator 22 . When the resonance frequencies of the qubit and resonator are close 23 , the more sensitive the qubit is to the signal (i.e., it requires less power [in dBm] to be detected/observed as a line in the spectroscopy).…”

Section: Background and Summarymentioning

confidence: 99%

Optimizing Qubit Performance through Smoothing Techniques

Malashin,

Masich,

Tynchenko

et al. 2024

Preprint

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This study explores novel approach to enhance the performance of qubits by leveraging signal smoothing algorithms to qubit chips, aiming primarily to mitigate experimental variability and enhance overall stability. This effort is intricately tied to the improvement of the Hamiltonian spectrum. By optimizing qubit operation through advanced smoothing techniques, we not only extend coherence times but also ascertain the robustness and quality of the qubit. Our findings highlight a substantial improvement in the precision of quantum information processing, indicating enhanced reliability in quantum computing experiments. Please note: Abbreviations should be introduced at the first mention in the main text – no abbreviations lists. Suggested structure of main text (not enforced) is provided below.

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Section: Background and Summarymentioning

confidence: 99%

Optimizing Qubit Performance through Smoothing Techniques

Malashin,

Masich,

Tynchenko

et al. 2024

Preprint

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“…Refs. 1,3,5,[31][32][33][34][35][36][37][38][39] , when a chain of equations is restrained by keeping only the first-order correlators. To describe time-evolution experiments, a semiquantum approach is more correct 17,40,41 ; comparison of the two approaches can be found e.g.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic motional averaging

et al. 2020

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In a continuous measurement scheme a spin-1/2 particle can be measured and simultaneously driven by an external resonant signal. When the driving is weak, it does not prevent the particle wave-function from collapsing and a detector randomly outputs two responses corresponding to the states of the particle. In contrast, when driving is strong, the detector returns a single response corresponding to the mean of the two single-state responses. This situation is similar to a motional averaging, observed in nuclear magnetic resonance spectroscopy. We study such quantum system, being periodically driven and probed, which consists of a qubit coupled to a quantum resonator. It is demonstrated that the transmission through the resonator is defined by the interplay between driving strength, qubit dissipation, and resonator linewidth. We demonstrate that our experimental results are in good agreement with numerical and analytical calculations.

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“…One interesting aspect, which was extensively studied recently, is the amplification/attenuation of microwave quantum signals. [22][23][24][25][26][27] . The Rabi oscillations are adjusted by driving to match the weak (probe) signal frequency, Ω R ≈ ω p .…”

Section: Introductionmentioning

confidence: 99%

Landau-Zener-Stückelberg-Majorana lasing in circuit quantum electrodynamics

et al. 2016

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We demonstrate amplification (and attenuation) of a probe signal by a driven two-level quantum system in the Landau-Zener-Stückelberg-Majorana regime by means of an experiment, in which a superconducting qubit was strongly coupled to a microwave cavity, in a conventional arrangement of circuit quantum electrodynamics. Two different types of flux qubit, specifically a conventional Josephson junctions qubit and a phase-slip qubit, show similar results, namely, lasing at the working points where amplification takes place. The experimental data are explained by the interaction of the probe signal with Rabi-like oscillations. The latter are created by constructive interference of Landau-Zener-Stückelberg-Majorana (LZSM) transitions during the driving period of the qubit. A detailed description of the occurrence of these oscillations and a comparison of obtained data with both analytic and numerical calculations are given.

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Signal amplification in a qubit-resonator system

Cited by 9 publications

References 43 publications

Optimizing Qubit Performance through Smoothing Techniques

Optimizing Qubit Performance through Smoothing Techniques

Probabilistic motional averaging

Landau-Zener-Stückelberg-Majorana lasing in circuit quantum electrodynamics

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