Physical properties of a laser beam and the intracavity quantum state
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We use the impossibility of sending information faster than light to show that it is impossible to distinguish between various types of laser cavity field state, such as a Fock state of uncertain energy and any superposition of Fock states of unknown free evolution time, by means of the physically measurable properties of the laser beam. Superpositions can include coherent states, squeezed states and cat states, indeed any pure intracavity state will produce the characteristic properties of the beam such as intrinsic phase coherence.
Physics Letters A
Copyright 2012 Elsevier B.V.. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.