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Physical Review A

Vibrational Schrödinger-cat states

József Janszky, Aleksandr V Vinogradov, T. Kobayashi, Z. Kis

Published Aug 1, 1994• 42 citations
Publisher

Abstract

The optical Schr\"odinger-cat states are simple realizations of quantum states having nonclassical features. It is shown that vibrational analogs of such states can be realized in an experiment of double-pulse or chirped-pulse excitation of vibronic transitions. The possibility of conversion of vibrational Schr\"odinger-cat states to chemical-cat states is discussed.

DOI
10.1103/physreva.50.1777

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The optical Schr"odinger-cat states are simple realizations of quantum states having nonclassical features. It is shown that vibrational analogs of such states can be realized in an experiment of double-pulse or chirped-pulse excitation of vibronic transitions. The possibility of conversion of vibrational Schr"odinger-cat states to chemical-cat states is discussed.
We describe the properties of a quantum system prepared in superpositions of classically distinguishable states. These states, often called Schrödinger cat states, are of great interest at present. We discuss how they may be realized in quantum optics using nonlinear interactions and cavity quantum electrodynamics. We first describe the quantum properties of field states in a cavity, and demonstrate the interference properties which characterize superposition states and discuss how fragile they are in dissipative environments. Finally, we review current experimental approaches which may realize these states.
Taking the decoherence into account, we investigate nonclassical features of the optical Schr\"odinger cat states in one-mode and two-coupled-modes systems with two-photon driving. In the one-mode system, the relationship between the Schr\"odinger cat states and the system parameters is derived. We observe that in the presence of single-photon decay the steady states would be a mixture of Schr\"odinger cat states. The dynamics and steady states of such a cat versus single-photon decay are examined. In the two-coupled-modes cases with linear and nonlinear couplings, the dynamics of entanglement and mutual information are examined with two different initial states and single-photon decay. Compared to the linear coupling case, more complicated structure appears in the Wigner function in the nonlinear coupling case. The joint quadrature distributions are also explored. Such nonclassical states can be used not only in exploring the boundary between the classical and the quantum worlds but also in quantum metrology and quantum information processing.