Name of the Journal:
Phys. Rev. B
Date of Pub:
August 24, 2015
Year of Publication:
2015
Volume:
92
Issue:
6
Pages:
064516
Publisher Name, Address and Year:
American Physical Society
Abstract:
We evaluate the microwave admittance of a one-dimensional chain of fluxonium qubits coupled by shared inductors. Despite its simplicity, this system exhibits a rich phase diagram. A critical applied magnetic flux separates a homogeneous ground state from a phase with a ground state exhibiting inhomogeneous persistent currents. Depending on the parameters of the array, the phase transition may be a conventional continuous one, or of a commensurate-incommensurate nature. Furthermore, quantum fluctuations affect the transition and possibly lead to the presence of gapless “floating phases.” The signatures of the soft modes accompanying the transitions appear as a characteristic frequency dependence of the dissipative part of admittance.
DOI Link:
arXiv.org Number: