Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 35: Superconducting Electronics: SQUIDs, Circuit QED

TT 35.12: Talk

Wednesday, March 20, 2024, 12:30–12:45, H 2053

Circuit-QED hardware for simulating features of quantum gravity — •Mohammad Atif Javed, Daniel Kruti, Ahmed Kenawy, Tobias Herrig, Christina Koliofoti, Oleksiy Kashuba, and Roman-Pascal Riwar — Peter Grünberg Institute, Theoretical Nanoelectronics, Forschungszentrum Jülich, D-52425 Jülich, Germany

The symbiosis of ideas between high-energy and condensed-matter physics has a long and fruitful tradition, be it the elusive Majorana fermion, the relativistic effects in graphene and Weyl semimetals, or the BCS theory serving as a blueprint for the Higgs mechanism. Here, we show that superconducting circuits can simulate fundamental and even highly speculative aspects of quantum gravity. We focus on two effects: Hawking radiation and quantum metrics. First, we demonstrate that the cosine behaviour of Josephson junctions allows for creating analogue wormholes with a single transient flux quench, subsequently permitting the system to evolve autonomously (unlike ultracold gases in which the drive is continuous). We propose two ways to detect the presence of these wormholes, first by observing the behavior of a wavepacket as it traverses the system and second by measuring how the correlations evolve in time in their presence. Second, using multi-stable Josephson junctions, we study how to create superpositions of different spacetime metrics. We can demonstrate the presence of this superposition with a wavepacket moving across the system that will split as it entangles with different metrics.

Keywords: Circuit QED; Josephson junctions; Non-reciprocity; Quantum metrics; Wormholes