Driven-Dissipative Entanglement of Distant Giant Atoms

The giant-atom regime of quantum optics—where an atom is comparable in size to the interacting wavelength of light—is readily accessible using superconducting circuits [1]. Coupling qubits to multiple points along a microwave waveguide gives rise to interference effects that enable decoherence-free interactions mediated by the 1D photonic continuum. Here, we engineer a system of two giant atoms coupled in series to the same waveguide. To stabilize entanglement between the distant giant atoms, we exploit the phenomena of superradiance and subradiance in driven-dissipative systems [2]. To store and characterize this remote entanglement, we tune the qubit frequencies in situ to employ a complementary interference effect that decouples the atoms from the waveguide. This entanglement-generation scheme naturally supports all-to-all connectivity between sequential giant atoms for applications in distributed quantum computation. In this talk, we present experimental progress toward realizing driven-dissipative entanglement between distant giant atoms. 

 

[1] B. Kannan et al. Waveguide quantum electrodynamics with superconducting artificial giant atoms. Nature 583, 775–779 (2020). 

[2] A. Soro et al. Chiral quantum optics with giant atoms. Phys. Rev. A 105, 023712 (2022).