Multiphoton spectroscopy of a hybrid quantum system

Bushev, Pavel; Müller, Clemens; Lisenfeld, Jürgen; Cole, Jared H.; Lukashenko, A.; Shnirman, Alexander; Ustinov, A. V.

doi:10.1103/physrevb.82.134530

Cited by 36 publications

(40 citation statements)

References 35 publications

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“…The formalism is enjoying a revival due to the generation of novel systems allowing strong driving fields and long enough coherence times, e.g. superconducting qubits and circuits 6,[14][15][16][17][18][19][20][21] , and topological insulators 22 . The Floquet formalism [23][24][25] is a semiclassical method that can be understood as a limiting case of a full quantum mechanical picture when the number of quanta in the driving field is large 23 .…”

Section: Introductionmentioning

confidence: 99%

Probe spectroscopy of quasienergy states

et al. 2013

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The present qubit technology, in particular in Josephson qubits, allows an unprecedented control of discrete energy levels. This motivates a new study of the old pump-probe problem, where a discrete quantum system is driven by a strong drive and simultaneously probed by a weaker one. The strong drive is included by the Floquet method and the resulting quasienergy states are then studied with the probe. We study a qubit where the harmonic drive has a significant longitudinal component relative to the static equilibrium state of the qubit. Both analytical and numerical methods are used to solve the problem. We present calculations with realistic parameters and compare the results with recent experimental results. A short introduction to the Floquet method and the probe absorption is given.

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Section: Introductionmentioning

confidence: 99%

Probe spectroscopy of quasienergy states

et al. 2013

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“…Otherwise they are conjectured to be of the same origin as the TLS observed as resonances in the high-frequency noise spectrum. Using superconducting qubits as probes, it is possible to fully characterise the properties of the strongly coupled defects, for example by measuring their level-structure and coherence times [16][17][18] . In this work, we discuss the origin of time-dependent fluctuations in the energy relaxation time T 1 , which are observed in superconducting 2D-Transmons 19 , flux qubits 20 and 3D-Transmons 14 , as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits

et al. 2015

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Since the very first experiments, superconducting circuits have suffered from strong coupling to environmental noise, destroying quantum coherence and degrading performance. In state-of-the-art experiments, it is found that the relaxation time of superconducting qubits fluctuates as a function of time. We present measurements of such fluctuations in a 3D-Transmon circuit and develop a qualitative model based on interactions within a bath of background two-level systems (TLS) which emerge from defects in the device material. In our model, the time-dependent noise density acting on the qubit emerges from its near-resonant coupling to high-frequency TLS which experience energy fluctuations due to their interaction with thermally fluctuating TLS at low frequencies. We support the model by providing experimental evidence of such energy fluctuations observed in a single TLS in a phase qubit circuit.

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“…Matching of the ground and higher states with the one-photon energy was exploited to probe the upper levels of the Josephson-junction circuits [19][20][21][22][23][24][25][26]. With increasing driving power, the multiphoton excitations were used to study the features of the artificial atoms both for the two-level dynamics [27][28][29][30][31] and when the upper levels were involved [32][33][34][35][36]. For strong driving, the width of the resonance lines periodically tends to zero, which can be described as the destructive Landau-Zener-Stückelberg interference [37].…”

Section: Introductionmentioning

confidence: 99%

Multiphoton transitions in Josephson-junction qubits (Review Article)

Shevchenko¹,

Omelyanchouk²,

Il’ichev³

2012

Low Temperature Physics

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Two basic physical models, a two-level system and a harmonic oscillator, are realized on the mesoscopic scale as coupled qubit and resonator. The realistic system includes moreover the electronics for controlling the distance between the qubit energy levels and their populations and to read out the resonator's state, as well as the unavoidable dissipative environment. Such rich system is interesting both for the study of fundamental quantum phenomena on the mesoscopic scale and as a promising system for future electronic devices.We present recent results for the driven superconducting qubit -resonator system, where the resonator can be realized as an LC circuit or a nanomechanical resonator. Most of the results can be described by the semiclassical theory, where a qubit is treated as a quantum two-level system coupled to the classical driving field and the classical resonator. Application of this theory allows to describe many phenomena for the single and two coupled superconducting qubits, among which are the following: the equilibrium-state and weak-driving spectroscopy, Sisyphus damping and amplification, Landau-Zener-Stückelberg interferometry, the multiphoton transitions of both direct and ladder-type character, and creation of the inverse population for lasing. Contents

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Multiphoton spectroscopy of a hybrid quantum system

Cited by 36 publications

References 35 publications

Probe spectroscopy of quasienergy states

Probe spectroscopy of quasienergy states

Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits

Multiphoton transitions in Josephson-junction qubits (Review Article)

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