Giant acoustic atom: A single quantum system with a deterministic time delay

By Lingzhen Guo, A. Grimsmo, Anton Frisk Kockum, M. Pletyukhov, G. Johansson. 2016

163 citations recorded by the source corpus.

We investigate the quantum dynamics of a single transmon qubit coupled to surface acoustic waves (SAWs) via two distant connection points. Since the acoustic speed is five orders of magnitude slower than the speed of light, the traveling time between the two connection points needs to be taken into account. Therefore, we treat the transmon qubit as a giant atom with a deterministic time delay. We find that the spontaneous emission of the system, formed by the giant atom and the SAWs between its connection points, initially decays polynomially in the form of pulses instead of a continuous exponential decay behavior, as would be the case for a small atom. We obtain exact analytical results for the scattering properties of the giant atom up to two-phonon processes by using a diagrammatic approach. We find that two peaks appear in the inelastic (incoherent) power spectrum of the giant atom, a phenomenon which does not exist for a small atom. The time delay also gives rise to features in the reflectance, transmittance, and second-order correlation functions of the system. Furthermore, we find the short-time dynamics of the giant atom for arbitrary drive strength by a numerically exact method for open quantum systems with a finite-time-delay feedback loop.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/6ea4dbaccd5804fc6725b5f893924df091d555de

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In Atomic and Molecular Physics, and Optics

Citations in the corpus

Microwave photonics with superconducting quantum circuits (2017, background): “If the travel time between the coupling points becomes comparable to or large than the timescale set by the coupling strength, neweffects occur, such as polynomial decay, additional single-photon reflection peaks beside the one at the atomic transition frequency, and switching of g (2)(τ ) between a”
Oscillating bound states for a giant atom (2019, methodology): “[57], we derive the equation of motion (EOM) for the probability amplitude of the giant atom being excited,”