On-demand analogue spacetime in superconducting networks: Grey holes, dynamical instability and exceptional points, by Mohammad Atif Javed, Daniel Kruti, Ahmed Kenawy, Tobias Herrig, Christina Koliofoti, Oleksiy Kashuba, Roman-Pascal Riwar
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SciPost Physics Home Authoring Refereeing Submit a manuscript About On-demand analogue spacetime in superconducting networks: Grey holes, dynamical instability and exceptional points Mohammad Atif Javed, Daniel Kruti, Ahmed Kenawy, Tobias Herrig, Christina Koliofoti, Oleksiy Kashuba, Roman-Pascal Riwar SciPost Phys. 20, 047 (2026) · published 17 February 2026 doi: 10.21468/SciPostPhys.20.2.047 pdf BiBTeX RIS Submissions/Reports Abstract There has been considerable effort to mimic analogue black holes and wormholes in solid state systems. Lattice realisations in particular present specific challenges. One of those is that event horizons in general have both white and black hole (grey hole) character, a feature guaranteed by the Nielsen-Ninomiya theorem. We here explore and extend the capability of superconducting circuit hardware to implement on-demand spacetime geometries on lattices, combining the nonreciprocity of gyrators with the non-linearity of Josephson junctions. We demonstrate the possibility of the metric sharply changing within a single lattice point, thus entering a regime where the modulation of system parameters is "trans-Planckian", and the Hawking temperature ill-defined. Instead of regular Hawking radiation, we find an instability in the form of an exponential burst of charge and phase quantum fluctuations over short time scales – a robust signature even in the presence of an environment. Moreover, we present a loop-hole for the typical black/white hole ambiguity in lattice simulations: exceptional points in the dispersion relation allow for the creation of pure black (or white) hole horizons, at the expense of a radical change in the dynamics of the wormhole interior. × TY - JOURPB - SciPost FoundationDO - 10.21468/SciPostPhys.20.2.047TI - On-demand analogue spacetime in superconducting networks: Grey holes, dynamical instability and exceptional pointsPY - 2026/02/17UR - https://scipost.org/SciPostPhys.20.2.047JF - SciPost PhysicsJA - SciPost Phys.VL - 20IS - 2SP - 047A1 - Javed, Mohammad AtifAU - Kruti, DanielAU - Kenawy, AhmedAU - Herrig, TobiasAU - Koliofoti, ChristinaAU - Kashuba, OleksiyAU - Riwar, Roman-PascalAB - There has been considerable effort to mimic analogue black holes and wormholes in solid state systems. Lattice realisations in particular present specific challenges. One of those is that event horizons in general have both white and black hole (grey hole) character, a feature guaranteed by the Nielsen-Ninomiya theorem. We here explore and extend the capability of superconducting circuit hardware to implement on-demand spacetime geometries on lattices, combining the nonreciprocity of gyrators with the non-linearity of Josephson junctions. We demonstrate the possibility of the metric sharply changing within a single lattice point, thus entering a regime where the modulation of system parameters is "trans-Planckian", and the Hawking temperature ill-defined. Instead of regular Hawking radiation, we find an instability in the form of an exponential burst of charge and phase quantum fluctuations over short time scales – a robust signature even in the presence of an environment. Moreover, we present a loop-hole for the typical black/white hole ambiguity in lattice simulations: exceptional points in the dispersion relation allow for the creation of pure black (or white) hole horizons, at the expense of a radical change in the dynamics of the wormhole interior.ER - × @Article{10.21468/SciPostPhys.20.2.047, title={{On-demand analogue spacetime in superconducting networks: Grey holes, dynamical instability and exceptional points}}, author={Mohammad Atif Javed and Daniel Kruti and Ahmed Kenawy and Tobias Herrig and Christina Koliofoti and Oleksiy Kashuba and Roman-Pascal Riwar}, journal={SciPost Phys.}, volume={20}, pages={047}, year={2026}, publisher={SciPost}, doi={10.21468/SciPostPhys.20.2.047}, url={https://scipost.org/10.21468/SciPostPhys.20.2.047},} Ontology / Topics See full Ontology or Topics database. Dynamical correlation functions Hawking radiation Josephson junction Mesoscopic systems Quantum quenches Superconductivity/superconductors Authors / Affiliation: mappings to Contributors and Organizations See all Organizations. 1 Mohammad Atif Javed, 1 Daniel Kruti, 1 Ahmed Kenawy, 1 Tobias Herrig, 1 Christina Koliofoti, 1 Oleksiy Kashuba, 1 Roman-Pascal Riwar 1 Forschungszentrum Jülich [FZ Jülich] Funder for the research work leading to this publication Bundesministerium für Bildung und Forschung / Federal Ministry of Education and Research [BMBF]