Microtoroidal cavity QED with fiber overcoupling and strong atom-field coupling: A single-atom quantum switch for coherent light fields

Scott Parkins, Takao Aoki

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We propose a scheme for single-atom, quantum control of the direction of propagation of a coherent field incident, via a tapered fiber, upon a microtoroidal whispering-gallery-mode (WGM) resonator. The scheme involves overcoupling of the fiber taper to the resonator and strong coupling of an atom to the evanescent field of the WGM, i.e., an atom-field coupling that exceeds the total WGM linewidth. In contrast to previous, related schemes that operate in the bad-cavity regime, the proposed scheme can operate effectively with much stronger incident fields, while also preserving their coherent nature. It can also serve to prepare an entangled state of the atom and coherent optical pulses propagating in opposite directions along the fiber. We evaluate the fidelity of preparation of such a state taking into account absorption and atomic spontaneous emission and demonstrate that high fidelities should be possible with realistic parameters.

Original languageEnglish
Article number053822
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume90
Issue number5
DOIs
Publication statusPublished - 2014 Nov 11

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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