Superconducting giant atom waveguide QED: Quantum Zeno and Anti-Zeno effects in ultrastrong coupling regime

Zhang, Xiaojun; Cheng, Wei; Gong, Zongping; Tao, Zheng; Wang, Zhihai

doi:10.48550/arxiv.2205.03674

Cited by 1 publication

(2 citation statements)

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“…With the technology available today, the model presented here is readily implementable with superconducting qubits coupled to either a microwave photonic crystal [19][20][21] or to a superconducting metamaterial [14,[22][23][24]. Moreover, as it has been showed in recent experiments, this platform can be used for quantum simulation of spinless bosonic models [55,57] and for the implementation of entangling or SWAP gates [14,25].…”

Section: Discussionmentioning

confidence: 96%

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Interaction between giant atoms in a one-dimensional structured environment

Soro¹,

Muñoz²,

Kockum³

2022

Preprint

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Giant atoms-quantum emitters that couple to light at multiple discrete points-are emerging as a new paradigm in quantum optics thanks to their many promising properties, such as decoherencefree interaction. While most previous work has considered giant atoms coupled to open continuous waveguides or a single giant atom coupled to a structured bath, here we study the interaction between two giant atoms mediated by a structured waveguide, e.g., a photonic crystal waveguide. This environment is characterized by a finite energy band and a band gap, which affect atomic dynamics beyond the Markovian regime. Here we show that, inside the band, decoherence-free interaction is possible for different atom-cavity detunings, but is degraded from the continuouswaveguide case by time delay and other non-Markovian effects. Outside the band, where atoms interact through the overlap of bound states, we find that giant atoms can interact more strongly and over longer distances than small atoms for some parameters-for instance, when restricting the maximum coupling strength achievable per coupling point. The results presented here may find applications in quantum simulation and quantum gate implementation.

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Section: Discussionmentioning

confidence: 96%

“…It is therefore natural to ask whether there is an advantage, with respect to small atoms, in coupling giant atoms to structured environments. While some recent works have touched upon this question [47][48][49][50][51][52][53][54][55], most of them focused on just a single GA.…”

Section: Introductionmentioning

confidence: 99%