BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:UW-Madison-Physics-Events BEGIN:VEVENT SEQUENCE:1 UID:UW-Physics-Event-9198 DTSTART:20250515T150000Z DTEND:20250515T230000Z DTSTAMP:20260413T135047Z LAST-MODIFIED:20250428T130806Z LOCATION:5310 Chamberlin SUMMARY:Superconducting quantum networks (and what to do with them)\, R. G. Herb Condensed Matter Seminar\, Wolfgang Pfaff\, UIUC DESCRIPTION:In a quantum network\, coherent qubit nodes communicate wi th each other in an on-demand fashion through photonic links. Such net works may be an interesting path toward scaling highly coherent quantu m systems\, provided they can be interfaced efficiently with photonic interfaces. In a more fundamental direction\, networks provide an intr iguing platform for investigating limits for preserving distributed qu antum states among weakly-interacting or non-interacting qubits. \n \ nCurrent research in our group is aimed at realizing different flavors of microwave quantum networks between superconducting qubits and cavi ties. Recently\, we have implemented high-efficiency interconnects for such networks [1]. In this talk\, I will focus on our efforts to use those interconnects for scaling superconducting quantum devices\, and to investigate the possibility of stabilizing entanglement in open sys tems. \n \nFirst\, we are interested in networks as a scaling approac h for high-coherence platforms. A bottleneck for such platforms is gen erally the choice of suitable nonlinearity for quantum state creation and detection. I will discuss our plans for combining high-Q cavities with the fluxonium qubit as high-coherence control and communication q ubit. As a first step toward that end\, we have investigated coupling a fluxonium to a linear storage resonator. We have investigated the no nlinearities in this system and used the fluxonium to create and reado ut quantum states in the resonator. Our results indicate that the flux onium may be a promising alternative to the transmon for operating\, m anipulating\, and connecting high-Q cavities. \n \nSecond\, we ask wh ether it is possible to autonomously stabilize entanglement between ef fectively non-interacting qubits. To answer this question\, we have re alized a prototypical cascaded quantum network between separate superc onducting qubit devices. Using local drives and nonreciprocal photon p ropagation\, we have implemented a protocol that is predicted to gener ate driven-dissipative remote entanglement [2]. I will present experim ental data that show evidence of entanglement stabilization. Additiona lly\, I will discuss perspectives for extending our setup for high-fid elity entanglement delivery and autonomous distillation [3]. \n \n[1] M. Mollenhauer\, et al.\, arXiv:2407.16743. Accepted in Nat. Electron . \n[2] K. Stannigel\, P. Rabl\, and P. Zoller\, New J. Phys. 14\, 063 014 (2012). \n[3] A. Irfan\, et al.\, Phys. Rev. Research 6\, 033212 ( 2024). \n URL:https://www.physics.wisc.edu/events/?id=9198 END:VEVENT END:VCALENDAR