Dynamical oscillator-cavity model for quantum memories

He, Q. Y., Reid, M. D., Giacobino, E., Cviklinski, J. and Drummond, P. D. (2009) Dynamical oscillator-cavity model for quantum memories. Physical Review A, 79 2: 022310-1-022310-15. doi:10.1103/PhysRevA.79.022310

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Author He, Q. Y.
Reid, M. D.
Giacobino, E.
Cviklinski, J.
Drummond, P. D.
Title Dynamical oscillator-cavity model for quantum memories
Journal name Physical Review A   Check publisher's open access policy
ISSN 1050-2947
Publication date 2009-02
Sub-type Article (original research)
DOI 10.1103/PhysRevA.79.022310
Open Access Status File (Publisher version)
Volume 79
Issue 2
Start page 022310-1
End page 022310-15
Total pages 15
Place of publication College Park, MD, United States
Publisher American Physical Society
Language eng
Formatted abstract
We propose a dynamical approach to quantum memories using an oscillator-cavity model. This overcomes the known difficulties of achieving high quantum input-output fidelity with long storage times compared to the input signal duration. We use a generic model of the memory response, which is applicable to any linear storage medium ranging from a superconducting device to an atomic medium. The temporal switching or gating of the device may either be through a control field changing the coupling, or through a variable detuning approach, as in more recent quantum memory experiments. An exact calculation of the temporal memory response to an external input is carried out. This shows that there is a mode-matching criterion which determines the optimum input and output pulse time evolution. This optimum pulse shape can be modified by changing the gate characteristics. In addition, there is a critical coupling between the atoms and the cavity that allows high fidelity in the presence of long storage times. The quantum fidelity is calculated both for the coherent state protocol, and for a completely arbitrary input state with a bounded total photon number. We show how a dynamical quantum memory can surpass the relevant classical memory bound, while retaining long storage times.
Keyword Quantum theory
Electromagnetically induced transparency
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 14 times in Scopus Article | Citations
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Created: Thu, 03 Sep 2009, 08:33:36 EST by Mr Andrew Martlew on behalf of ARC Centre of Excellence for Quantum-Atom Optics