Super-radiant phase transition in superconducting circuit in thermal equilibrium

Understand

We propose a superconducting circuit that shows a super-radiant phase transition (SRPT) in the thermal equilibrium.

• The existence of the SRPT is confirmed analytically in the limit of an infinite number of artificial atoms.
• We also perform numerical diagonalization of the Hamiltonian with a finite number of atoms and observe an asymptotic behavior approaching the infinite limit as the number of atoms increases.
• The SRPT can also be interpreted intuitively in a classical analysis.