Quantum Monte Carlo study of superradiant supersolid of light in the Jaynes-Cummings-Hubbard model.

What is it about?

Searching for and investigating supersolids is a long-term outstanding problem in physics. In addition to the solid element He4 and cold atoms as potential candidates for the supersolid, the quantum system of light realized by circuit quantum electrodynamics is also a promising platform. In this paper, we propose a supersolid phase, i.e., a superradiant supersolid of light, where superradiant, superfluid, and solid orders coexist. We theoretically simulate the extended Jaynes-Cummings-Hubbard model describing the circuit quantum electrodynamics systems, mainly by the large-scale worm quantum Monte Carlo method, and find that a superradiant supersolid phase exists on triangular lattices due to the antiferromagnetic correlation between photons via light-atom coupling. We also confirm that the previous supersolid of light given by Bujnowski et al. [Phys. Rev. A 90, 043801 (2014)] is not stable. The phase transition between our superradiant supersolid phase and the superradiant solid phase can be continuous (first order) and above (below) the “symmetry point.” This is not the same as the pure Bose-Hubbard model on triangular lattices. The results herein could help in the search for a new superradiant supersolid phase in circuit quantum electrodynamic experiments and other light-matter coupling systems.

Featured Image

Photo by Ling Tang on Unsplash

Photo by Ling Tang on Unsplash

Why is it important?

The supersolid (SS) phase is one of the most paradoxical predictions of quantum theory and has attracted great interest for decades.

Perspectives