Cavity polariton in a quasilattice of qubits and its selective radiation

Hou Ian and Yu-xi Liu
Phys. Rev. A 89, 043804 – Published 2 April 2014

Abstract

In a circuit quantum eletrodynamic system, a chain of N qubits inhomogeneously coupled to a cavity field forms a mesoscopic quasilattice, which is characterized by its degree of deformation from a normal lattice. This deformation is a function of the relative spacing, that is the ratio of the qubit spacing to the cavity wavelength. A polariton mode arises in the quasilattice as the dressed mode of the lattice excitation by the cavity photon. We show that the transition probability of the polariton mode is either enhanced or decreased compared to that of a single qubit by the deformation, giving a selective spontaneous radiation spectrum. Further, unlike a microscopic lattice with large-N limit and nearly zero relative spacing, the polariton in the quasilattice has uneven decay rate over the relative spacing. We show that this unevenness coincides with the cooperative emission effect expected from the superradiance model, where alternative excitations in the qubits of the lattice result in maximum decay.

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  • Received 17 September 2013

DOI:https://doi.org/10.1103/PhysRevA.89.043804

©2014 American Physical Society

Authors & Affiliations

Hou Ian1 and Yu-xi Liu2,3

  • 1Faculty of Science and Technology, University of Macau, Macau
  • 2Institute of Microelectronics, Tsinghua University, Beijing 100084, China
  • 3Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, China

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Issue

Vol. 89, Iss. 4 — April 2014

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