Quantum noise for Faraday light–matter interfaces

D.V. Vasliyev; K. Hammerer; N. Korolev; Anders Søndberg Sørensen

doi:10.1088/0953-4075/45/12/124007

Quantum noise for Faraday light–matter interfaces

D.V. Vasliyev, K. Hammerer, N. Korolev, Anders Søndberg Sørensen

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10 Citations (Scopus)

Abstract

In light–matter interfaces based on the Faraday effect, quite a number of quantum information protocols have been successfully demonstrated. In order to further increase the performance and fidelities achieved in these protocols, a deeper understanding of the relevant noise and decoherence processes needs to be gained. In this paper, we provide for the first time a complete description of the decoherence from spontaneous emission. We derive from first principles the effects of photons being spontaneously emitted into unobserved modes. Our results relate the resulting decay and noise terms in effective equations of motion for collective atomic spins and the forward-propagating light modes to the full atomic level structure. We illustrate and apply our results to the case of a quantum memory protocol. Our results can be applied to any alkali atoms, and the general approach taken in this paper can be applied to light–matter interfaces and quantum memories based on different mechanisms.

Original language	English
Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Volume	45
Issue number	12
Pages (from-to)	124007
ISSN	0953-4075
DOIs	https://doi.org/10.1088/0953-4075/45/12/124007
Publication status	Published - 28 Jun 2012

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T1 - Quantum noise for Faraday light–matter interfaces

AU - Vasliyev, D.V.

AU - Hammerer, K.

AU - Korolev, N.

AU - Sørensen, Anders Søndberg

PY - 2012/6/28

Y1 - 2012/6/28

N2 - In light–matter interfaces based on the Faraday effect, quite a number of quantum information protocols have been successfully demonstrated. In order to further increase the performance and fidelities achieved in these protocols, a deeper understanding of the relevant noise and decoherence processes needs to be gained. In this paper, we provide for the first time a complete description of the decoherence from spontaneous emission. We derive from first principles the effects of photons being spontaneously emitted into unobserved modes. Our results relate the resulting decay and noise terms in effective equations of motion for collective atomic spins and the forward-propagating light modes to the full atomic level structure. We illustrate and apply our results to the case of a quantum memory protocol. Our results can be applied to any alkali atoms, and the general approach taken in this paper can be applied to light–matter interfaces and quantum memories based on different mechanisms.

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JO - Journal of Physics B: Atomic, Molecular and Optical Physics

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Quantum noise for Faraday light–matter interfaces

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