Quantum

Quantum theory of damping: A new approach to temporal evolution of density operator without the rotating wave approximation

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Briefings

A new quantum theory derives a generalized Lindblad master equation that includes counter-rotating terms, correcting the rotating-wave approximation used in standard open quantum system descriptions. The study applies this framework to two-level atoms and quantized fields interacting with thermal or squeezed reservoirs, showing that neglecting these terms significantly alters decay rates and observable evolution.

Key points

• The generalized Lindblad master equation retains full system-reservoir coupling by including counter-rotating terms, unlike the conventional rotating-wave approximation.
• For a thermal reservoir, increasing the mean thermal photon number enhances the decay of the sigma_y observable beyond the RWA but suppresses it within the RWA.

Context

This research addresses a standard framework for open quantum systems where the rotating-wave approximation is commonly used. The new approach corrects this by including counter-rotating terms, which are often neglected in conventional derivations.

Limitations

The study covers two prototypical systems (two-level atom and single-mode field) with thermal or squeezed reservoirs. Results are based on Wigner-Weisskopf theory and may not apply universally to all open quantum systems without further validation.

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