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Condensed Matter Seminar - "Assembling quantum systems from the bottom up through engineered qubit-photon couplings"

Event Type
Physics - Condensed Matter
ESB 190
Apr 28, 2023   1:00 pm  
Wolfgang Pfaff, University of Illinois at Urbana-Champaign
Stephen Bullwinkel
Originating Calendar
Physics - Condensed Matter Seminar

**PLEASE NOTE NEW DATE: FRI, 4/28/2023**

Superconducting circuits are a leading platform for building large-scale quantum devices, such as quantum processors or simulators, qubit-by-qubit. Scaling circuits to larger sizes is, however, a significant engineering challenge: Owing to inevitable imperfections in circuit design and manufacturing, controlling the interactions between individual qubits becomes harder to manage and characterize as the system size grows.

In this talk I will discuss our efforts to build quantum systems using a ‘weak interaction’ approach. Instead of directly coupling qubits to each other, we engineer tunable interactions between qubits and photons, which we then use to mediate qubit-qubit coupling. The exquisite and versatile control over qubit-photon interactions provided by the circuit quantum electrodynamics platform can allow us to generate highly entangled multi-qubit states, even in extreme regimes where qubits do not couple directly to each other at all. In particular, I will discuss prospects for realizing autonomously stabilized multipartite entanglement using engineered nonreciprocity. 

Our research may provide a robust path toward realizing scalable bottom-up engineered quantum systems and modular quantum processors.

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