On 1st October 2017, Motoaki BAMBA was appointed a PRESTO Researcher at “Quantum state control and functionalization” Project, Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), JAPAN
Superradiant Phase Transition in a Superconducting Circuit in Thermal Equilibrium
We propose a superconducting circuit that shows a superradiant phase transition (SRPT) in thermal equilibrium. The existence of the SRPT is confirmed analytically in the limit of an infinite number of artificial atoms. We also perform a 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.