title: First-order superradiant phase transitions in a multiqubit cavity system.
authors.affiliation: Centre for Quantum Computation and Physics Department, Clarendon Laboratory, Oxford University, Parks Road, Oxford OX1 3PU, United Kingdom.
authors.forename: Chiu Fan
authors.initials: CF
authors.lastname: Lee
authors.forename: Neil F
authors.initials: NF
authors.lastname: Johnson