Engineered light-matter interactions in slow-light waveguides
Circuit quantum electrodynamics (QED) is a very promising platform to simulate a quantum many-body Hamiltonian. In fact, many experimental results have already demonstrated how simple chemical processes can be studied with this approach. However, long-range interaction is a missing ingredient in the standard circuit QED toolbox. When a quantum emitter is coupled to a waveguide with an engineered dispersion relation, it becomes dressed with an exponentially decaying photonic cloud, emerging as an atom-photon bound state. The interaction of two atom- photon bound states not only goes beyond the simple nearest-neighbor (short) interaction but is intrinsically tunable by tuning the localization length of the photonic cloud. We realize this physics with a waveguide made of lumped-elements and explore new coupling regimes and geometry.
Photons go one way or another
S. Gasparinetti, Photons Go One Way or Another, Nature Physics 19, 310 (2023). Full-text access (via SharedIt)
Experimental realization of deterministic and selective photon addition in a bosonic mode assisted by an ancillary qubit
M. Kudra, T. Abad, M. Kervinen, A. M. Eriksson, F. Quijandría, P. Delsing, and S. Gasparinetti, Experimental Realization of Deterministic and Selective Photon Addition in a Bosonic Mode Assisted by an Ancillary Qubit, arXiv:2212.12079.
Engineering symmetry-selective couplings of a superconducting artificial molecule to microwave waveguides
Mohammed Ali Aamir, Claudia Castillo Moreno, Simon Sundelin, Janka Biznárová, Marco Scigliuzzo, Kowshik Erappaji Patel, Amr Osman, D. P. Lozano, Simone Gasparinetti, Engineering symmetry-selective couplings of a superconducting artificial molecule to microwave waveguides. Physical Review Letters 129, 123604 (2022). (Editors’ Suggestion)
Controlling Atom-Photon Bound States in an Array of Josephson-Junction Resonators
M. Scigliuzzo, G. Calajò, F. Ciccarello, D. P. Lozano, A. Bengtsson, P. Scarlino, A. Wallraff, D. Chang, P. Delsing, and S. Gasparinetti, Controlling Atom-Photon Bound States in an Array of Josephson-Junction Resonators. Physical Review X 12, 031036 (2022)
Propagating Wigner-negative states generated from the steady-state emission of a superconducting qubit
Y. Lu, I. Strandberg, F. Quijandría, G. Johansson, S. Gasparinetti, and P. Delsing, Propagating Wigner-Negative States Generated from the Steady-State Emission of a Superconducting Qubit, Phys. Rev. Lett. 126, 253602 (2021).
Characterizing decoherence rates of a superconducting qubit by direct microwave scattering
Y. Lu, A. Bengtsson, J. J. Burnett, E. Wiegand, B. Suri, P. Krantz, A. F. Roudsari, A. F. Kockum, S. Gasparinetti, G. Johansson, and P. Delsing, Characterizing Decoherence Rates of a Superconducting Qubit by Direct Microwave Scattering, Npj Quantum Information 7, 1 (2021).
Parity Detection of Propagating Microwave Fields
J.-C. Besse, S. Gasparinetti, M. C. Collodo, T. Walter, A. Remm, J. Krause, C. Eichler, and A. Wallraff, Parity Detection of Propagating Microwave Fields, Phys. Rev. X 10, 011046 (2020).