Phys. Rev. B 77, 144507 (2008) [7 pages]Quantum metamaterials: Electromagnetic waves in a Josephson qubit line
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 effects, such as a “breathing” photonic crystal with an oscillating band gap and a “quantum Archimedean screw” that transports, at an arbitrary controlled velocity, Josephson plasma waves through a transmission line. 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.144507
DOI:
10.1103/PhysRevB.77.144507
PACS:
74.78.Fk, 74.50.+r, 42.50.−p
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