Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.40: Poster
Monday, March 17, 2025, 15:00–18:00, P4
Collective behavior of qubits coupled to a common wave-guide — •Johannes Friedrich1,2, Gerhard Huber1,2, Joan Agustí1,2, Gesa Dünnweber1,2, Christian Schneider1,2, and Stefan Filipp1,2 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften
The behavior of multiple qubits coupled to a common waveguide cannot be understood as the additive behavior of single qubits. Since the waveguide can mediate an all-to-all interaction between qubits via propagating photons, collective radiant states, such as superradiant, subradiant, and twilight states, can be formed [1,2]. Using superconducting qubits offers control over multiple system parameters such as individual qubit frequency, coupling and spacing and enables the realization of 1D waveguides with large coupling to decoherence ratios, parameters difficult to achieve in atomic systems. Here, we explore parameter regimes beyond time and spatial uniform couplings, providing insights into designing quantum devices with controllable radiative properties.
We acknowledge financial support from GeQCoS, MUNIQC-SC, MCQST, OpenSuperQPlus100, the Munich Quantum Valley and the Deutsche Forschungsgemeinschaft.
[1] Y. Ke, et al., Phys. Rev. Lett. 123, 253601 (2019).
[2] B. Kannan et al., Nature 583 (2020).
Keywords: waveguide; QED; metamaterial; superconducting; transmon