An Interdisciplinary Journal

* 2011, Vol.14, No.3, pp.241-252*

We discuss exploiting artificially designed nonlinear coherent loss
for generating non-classical states of a bosonic mode. Of special
interest is the case when superpositions of Fock states are
generated. We discuss conditions necessary for generation of pure
superpositions and estimate maximal achievable fidelity. It is shown
that the fidelity can be arbitrary close to unity for generation of
either single Fock state, or infinite superposition of equidistant
Fock states (e.g. a superposition of Fock states with odd number of
particles), but is limited by the value 0.94, for instance, for
superpositions of any two Fock states. Certain general necessary and
(or) sufficient conditions for generation of pure states are also
provided and illustrated by examples.

*Key words: *
nonclassical state, Bose-Einstein condensate, fidelity

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Last updated: *November 4, 2011*