Abstract
The rapidly increasing capability to modulate the physicochemical properties of atomic groups and molecules by means of their coupling to radiation, as well as the revolutionary potential of quantum computing for materials simulation and prediction, fuel the interest for non-classical phenomena produced by atom-radiation interaction in confined space. One of such phenomena is a “parity effect” that arises in the dynamics of an atom coupled to two degenerate cavity field modes by two-photon processes and manifests itself as a strong dependence of the field dynamics on the parity of the initial number of photons. Here we identify the physical origin of this effect in the quantum correlations that produce entanglement among the system components, explaining why the system evolution depends critically on the parity of the total number of photons. Understanding the physical underpinnings of the effect also allows us to characterize it within the framework of quantum information theory and to generalize it. Since a single photon addition/removal has dramatic effects on the system behavior, this effect may be usefully applied, also for amplification purposes, to optoelectronics and quantum information processing.
Highlights
The past decade has witnessed a rapidly growing interest in quantum coherence that may be used to enhance the physicochemical function in novel electronic materials or in biomolecular systems, where coherence can be detected against the typical incoherent background using spec troscopic techniques such as, e.g., two-dimensional electronic spec troscopy [1]
The mid-plateau mutual entropy of the two modes, S1:2(t), remains above the upper bound in classically correlated systems for both even and odd n (Figs. 5-6 and H1), as quantum entanglement is necessary for the system evolution from an initially factorized state and back to states in which one mode is predominantly populated
We explained the physical origin of the quantum optics parity effect [31,32], which manifests itself as the sensitivity of the atom-radiation dynamics in high-Q resonators to single-photon changes in the cavity field
Summary
The past decade has witnessed a rapidly growing interest in quantum coherence that may be used to enhance the physicochemical function in novel electronic materials or in biomolecular systems, where coherence can be detected against the typical incoherent background using spec troscopic techniques such as, e.g., two-dimensional electronic spec troscopy [1]. (5) and (6) explain the existence of plateaus in Fig. 1a and d and the slow evolution of the photon population towards and from states of high symmetry with respect to the two field modes.
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