Pulse engineering for population control under dephasing and dissipation

TL;DR

This paper develops a reverse-engineering approach to design electromagnetic pulses that control populations in quantum systems affected by dephasing and dissipation, with potential applications in quantum memories.

Contribution

It introduces analytical pulse solutions for population control in noisy quantum systems and identifies conditions for steady states with finite coherence.

Findings

Analytical pulse solutions for two-level systems under noise

Conditions for achieving steady states with coherence

Insights into quantum memory applications

Abstract

We apply reverse-engineering to find electromagnetic pulses that allow for the control of populations in quantum systems under dephasing and thermal noises. In particular, we discuss two-level systems given their importance in the description of several molecular systems as well as quantum computing. Such an investigation naturally finds applications in a multitude of physical situations involving the control of quantum systems. We present an analytical description of the pulse which solves a constrained dynamics where the initial and final populations are fixed a priori. This constrained dynamics is sometimes impossible and we precisely spot the conditions for that. One of our main results is the presentation of analytical conditions for the establishment of steady states for finite coherence in the presence of noise. This might naturally find applications in quantum memories.