Does "as a basic building block" refer to "(the interaction) as a basic building block"?

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Or "(the multiatom ensembles) as a basic building block"?

Context:
During the past decade the interaction of light with multiatom ensembles has attracted much attention as a basic building block for quantum information processing and quantum state engineering. The field started with the realization that optically thick free space ensembles can be efficiently interfaced with quantum optical fields. By now the atomic ensemble-light interfaces have become a powerful alternative to the cavity-enhanced interaction of light with single atoms. Various mechanisms used for the quantum interface are discussed, including quantum nondemolition or Faraday interaction, quantum measurement and feedback, Raman interaction, photon echo, and electromagnetically induced transparency. This review provides a common theoretical frame for these processes, describes basic experimental techniques and media used for quantum interfaces, and reviews several key experiments on quantum memory for light, quantum entanglement between atomic ensembles and light, and quantum teleportation with atomic ensembles. The two types of quantum measurements which are most important for the interface are discussed: homodyne detection and photon counting. This review concludes with an outlook on the future of atomic ensembles as an enabling technology in quantum information processing.

More:
http://journals.aps.org/rmp/abstract/10.1103/RevModPhys.82.1041

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@oristarA,

Yes, the interaction is dynamic and information processing is dynamic. They match.

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@FBM,

Thank you.

Who would like to explain what is " that optically thick (free space ensembles)"? Here is a newest report saying "the weaker the light, the better (the entanglement)";

Quote:

Now Vuletic and his colleagues have successfully created a mutual entanglement among 3,000 atoms, virtually all the atoms in the ensemble, using very weak laser light -- down to pulses containing a single photon. The weaker the light, the better, Vuletic says, as it is less likely to disrupt the cloud. "The system remains in a relatively clean quantum state," he says.

http://www.sciencedaily.com/releases/2015/03/150325151903.htm

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@oristarA,

I'm out of my depth there, but here's the Wiki on it: http://en.wikipedia.org/wiki/Optical_depth

Quote:

In physics, optical depth or optical thickness or Napierian absorbance, is the natural logarithm of the ratio of incident to transmitted radiant power through a material, and spectral optical depth or spectral optical thickness or spectral Napierian absorbance is the natural logarithm of the ratio of incident to transmitted spectral radiant power through a material.[1] Optical depth is dimensionless, and in particular is not a length, though it is a monotonically increasing function of path length, and approaches zero as the path length approaches zero. The use of the term "optical density" for optical depth is discouraged.[1]
In chemistry, a closely related quantity called "absorbance" or "decadic absorbance" is used instead of optical depth: the common logarithm of the ratio of incident to transmitted radiant power through a material, that is the optical depth divided by ln 10.

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Does "as a basic building block" refer to "(the interaction) as a basic building block"?

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