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Appointed a PRESTO Researcher

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

Published in Physical Review Letters

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.