IQIM Postdoctoral and Graduate Student Seminar

Note: this talk begins at 2:00 pm in 105 Annenberg

Abstract: Developing quantum interconnects for distributed quantum computing and sensing motivates exploration of controlled light-matter interaction. Remote entanglement generation schemes typically leverage coherent, reversible interactions, requiring precise timing and calibration. Alternatively, driven-dissipative approaches exploit correlated dissipation to stabilize steady-state, environment-protected entanglement; however, rotating into unprotected states to use the entanglement causes decay, limiting protocol fidelity. Here, we employ giant artificial atoms to implement tunable dissipation enabled by interference between two atom-waveguide coupling points. We autonomously stabilize remote entanglement by driving two giant atoms coupled in series to a shared waveguide with a single, continuous microwave tone. To store this entanglement, we tune the qubit frequencies in situ to decouple them from the waveguide, protecting the entire two-qubit subspace from dissipation. We deterministically entangle the distant giant atoms, achieving Bell-state fidelity F = 0.89 ± 0.02. This demonstration establishes steady-state entanglement as a viable resource for all-to-all connectivity in distributed quantum networks.

Refreshments will be served following the talk.