Rydberg excitation assisted light shift blockade in Rb atoms for realizing a collective state quantum bit and quantum memory

Yanfei Tu, May E. Kim, Selim M Shahriar*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Previously, we had proposed the technique of light shift imbalance induced blockade which leads to a condition where a collection of non-interacting atoms under laser excitation remains combined to a superposition of the ground and the fist excited states, thus realizing a collective state quantum bit which in turn can be used to realize a quantum computer. In this paper, we show first that the light shift imbalance by itself is actually not enough to produce such a blockade, and explain the reason by the limitation of our previous analysis had reached this constraint. We then show that by introducing Rydberg interaction, it is possible to achieve such a blockade for a wide range of parameters. Analytic arguments used to establish these results are confirmed by numerical simulations. The fidelity of coupled quantum gates based on such collective state qubits is highly insensitive to the exact number of atoms in the ensemble. As such, this approach may prove be viable for scalable quantum computing based on neutral atoms.

Original languageEnglish (US)
Title of host publicationQuantum Communications and Quantum Imaging XII
EditorsRonald E. Meyers, Yanhua Shih, Keith S. Deacon
PublisherSPIE
Volume9225
ISBN (Electronic)9781628412529
DOIs
StatePublished - Jan 1 2014
EventQuantum Communications and Quantum Imaging XII - San Diego, United States
Duration: Aug 18 2014Aug 21 2014

Other

OtherQuantum Communications and Quantum Imaging XII
CountryUnited States
CitySan Diego
Period8/18/148/21/14

Keywords

  • Atomic ensemble
  • Light shift blockade
  • Quantum bit
  • Rydberg interaction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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