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Quantum metamaterials: Electromagnetic waves in Josephson qubit lines
Author(s) -
Zagoskin A. M.,
Rakhmanov A. L.,
Savel'ev Sergey,
Nori Franco
Publication year - 2009
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200881568
Subject(s) - qubit , superconducting quantum computing , flux qubit , charge qubit , physics , josephson effect , phase qubit , quantum mechanics , condensed matter physics , quantum superposition , superconductivity , transmission line , metamaterial , coherent states , quantum , telecommunications , computer science
We consider the propagation of a classical electromagnetic wave through a transmission line, formed by identical superconducting charge qubits inside a superconducting resonator. Since the qubits can be in a coherent superposition of quantum states, we show that such a system demonstrates interesting new effects, such as a “breathing” photonic crystal with an oscillating bandgap. Similar behaviour is expected from a transmission line formed by flux qubits. The key ingredient of these effects is that the optical properties of the Josephson transmission line are controlled by the quantum coherent state of the qubits (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)