Nonuniversality and strongly interacting two-level systems in glasses at low temperatures

Schechter, Moshe; Nalbach, P.; Burin, Alexander L.

doi:10.1088/1367-2630/aac930

Cited by 11 publications

(8 citation statements)

References 60 publications

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“…In our opinion this discrepancy can be understood, assuming that the standard model of interacting TLSs in three dimensions is not quite relevant for quantum two level systems in Josephson junctions. Particularly, amorphous films used in Josephson junctions possess the reduced dimensionality that can affect the interaction between TLSs and/or their statistics [43,44]. The theory should be modified accordingly, which is beyond the scope of the present work.…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

“…We begin with the consideration of intermediate Rabi frequencies 1/T sd < Ω R0 < T 20 /T 2 sd , where the non-linear microwave absorption by individual TLSs is determined by Eq. (44). At smaller Rabi frequencies, Ω R ≪ 1/T sd , absorption takes place in the linear regime, while at larger Rabi frequency, Ω R0 > T 20 /T 2 sd , the detuning by the spectral diffusion T 20 /T 2 sd can be neglected compared to the Rabi frequency, and the loss tangent is defined by Eq.…”

Section: Analytical and Numerical Evaluations Of The Loss Tangentmentioning

confidence: 99%

“…In the case of interest this product can be written in the approximate analytical form, derived from Eq. (44),…”

Section: Analytical and Numerical Evaluations Of The Loss Tangentmentioning

confidence: 99%

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Theory of nonlinear microwave absorption by interacting two-level systems

Burin

Maksymov

2018

Phys. Rev. B

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The microwave absorption and noise caused by quantum two-level systems (TLS) dramatically suppress the coherence in Josephson junction qubits that are promising candidates for quantum information applications. It is a challenge to understand microwave absorption by TLSs because of the spectral diffusion resulting from fluctuations in their resonant frequencies induced by their long-range interactions. Here we treat the spectral diffusion explicitly using the generalized master equation formalism. The proposed theory predicts that the linear absorption regime holds while a TLS Rabi frequency is smaller than their phase decoherence rate. At higher external fields, a novel non-linear absorption regime is found with the loss tangent inversely proportional to the intensity of the field. The theory can be generalized to acoustic absorption and lower dimensions realized in superconducting qubits.

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Section: Discussion Of Experimentsmentioning

confidence: 99%

Section: Analytical and Numerical Evaluations Of The Loss Tangentmentioning

confidence: 99%

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Theory of nonlinear microwave absorption by interacting two-level systems

Burin

Maksymov

2018

Phys. Rev. B

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“…Recent studies of TLS noise mechanisms for KIDs and qubits have shown the importance of a more in-depth understanding of TLSs [5,19,[21][22][23]. Two recent theories explain that the interaction between TLSs is responsible for 1/f frequency noise whereby low-frequency thermally fluctuating TLSs influence high-frequency (near-resonance) TLSs [24,25], which in turn interacts with the high frequency superconducting mode [26,27]. Traditionally there is a strategy to minimize the influence of TLSs in KIDs and qubits through material choices [28][29][30][31][32] and geometry optimization [4].…”

Section: Introductionmentioning

confidence: 99%

Dual-Resonator Kinetic-Inductance Detector for Distinction between Signal and 1/f Frequency Noise

Foroozani¹,

Sarabi²,

Moseley³

et al. 2022

Preprint

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Astronomical Kinetic Inductance Detectors (KIDs), similar to quantum information devices, experience performance limiting noise from materials. In particular, 1/f (frequency) noise can be a dominant noise mechanism, which arises from Two-Level System defects (TLSs) in the circuit dielectrics and material interfaces. Here we present a Dual-Resonator KID (DuRKID), which is designed for improved signal to noise (or noise equivalent power) relative to 1/f-noise limited KIDs. We first show the DuRKID schematic, fabricated circuit, and we follow with a description of the intended operation, first measurements, theory, and discussion. The circuit consists of two superconducting resonators sharing an electrical capacitance bridge of 4 capacitors, each of which hosts TLSs. The device is intended to operate using hybridization of the modes, which causes TLSs to either couple to one mode or the other, depending upon which capacitor they reside in. In contrast, the intended KID signal is directed to an inductor, and due to hybridization this causes correlated frequency changes in both (hybridized) modes. Therefore, one can distinguish photon signal from TLS frequency noise. To achieve hybridization, a TiN inductor is current biased to allow tuning of one bare resonator mode into degeneracy with the other and measurements show that the intended resonator modes frequency tune and hybridize as expected. The interresonator coupling and unintentional coupling of the 2 resonators to transmission lines are also characterized in measurements. In the theory, based on a quantum-information-science modes, we calculate the 4-port S parameters and simulate the 1/f frequency noise of the device. The study reveals that the DuRKID can exhibit a large and fundamental performance advantage over 1/f-noise-limited KID detectors.

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“…В последние годы интерес к низкотемпературной динамике неупорядоченных твердотельных систем и правомерности концепции ДУС значительно возрос. Это связано, в частности, с появлением новых твердотельных объектов, используемых при низких температурах, например, кубитов на сверхпроводящих структурах [8] или квантовых сверхпроводниковых однофотонных детекторов [9].…”

Section: Introductionunclassified

В Каких Случаях И Почему Стандартная Модель Туннелирующих Двухуровневых Систем Неадекватно Описывает Низкотемпературную Внутреннюю Динамику Реальных Стекол

Вайнер¹

2019

Журнал Технической Физики

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Experiments carried out in recent years using single-molecule spectroscopy to study the low-temperature dynamics of some molecular solid-state media with a disordered internal structure made it possible to obtain new information on the dynamics of such media at the local level. In some substances, the time-dependent behavior of the majority of individual spectra of single fluorescent molecules introduced into the studied medium as a local spectral probe corresponded to the predictions of the standard model of tunneling two-level systems. In others, the behavior of most of the spectra of single molecules was more complicated, which it is difficult to describe in the framework of the standard model. This paper is devoted to the analysis of the results of studies of low-temperature spectral dynamics of single fluorescent molecules in a number of disordered molecular systems (amorphous polyisobutylene, toluene, cumene, propylene carbonate). The observed deviations from the predictions of the theory are associated with the microstructure of the systems under study and the sample shape. Possible reasons for the deviations of the observed local spectral dynamics from the predictions of the standard model of tunneling two-level systems are discussed. Inadequately.

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Nonuniversality and strongly interacting two-level systems in glasses at low temperatures

Cited by 11 publications

References 60 publications

Theory of nonlinear microwave absorption by interacting two-level systems

Theory of nonlinear microwave absorption by interacting two-level systems

Dual-Resonator Kinetic-Inductance Detector for Distinction between Signal and 1/f Frequency Noise

В Каких Случаях И Почему Стандартная Модель Туннелирующих Двухуровневых Систем Неадекватно Описывает Низкотемпературную Внутреннюю Динамику Реальных Стекол

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