



01878nas a2200169   4500008004100000245007200041210006900113260001500182490000800197520135800205100002801563700001801591700001601609700002501625700002201650856003601672       2019                        eng d00aInteracting Qubit-Photon Bound States with Superconducting Circuits0 aInteracting QubitPhoton Bound States with Superconducting Circui  c2018/01/300 vX 93 a<p><span style="font-family: &quot;Lucida Grande&quot;, helvetica, arial, verdana, sans-serif; font-size: 14.4px;">Qubits strongly coupled to a photonic crystal give rise to many exotic physical scenarios, beginning with single and multi-excitation qubit-photon dressed bound states comprising induced spatially localized photonic modes, centered around the qubits, and the qubits themselves. The localization of these states changes with qubit detuning from the band-edge, offering an avenue of in situ control of bound state interaction. Here, we present experimental results from a device with two qubits coupled to a superconducting microwave photonic crystal and realize tunable on-site and inter-bound state interactions. We observe a fourth-order two photon virtual process between bound states indicating strong coupling between the photonic crystal and qubits. Due to their localization-dependent interaction, these states offer the ability to create one-dimensional chains of bound states with tunable and potentially long-range interactions that preserve the qubits&#39; spatial organization, a key criterion for realization of certain quantum many-body models. The widely tunable, strong and robust interactions demonstrated with this system are promising benchmarks towards realizing larger, more complex systems of bound states.</span></p>1 aSundaresan, Neereja, M.1 aLundgren, Rex1 aZhu, Guanyu1 aGorshkov, Alexey, V.1 aHouck, Andrew, A.  uhttp://arxiv.org/abs/1801.10167