Optimal Coherent Control to Counteract Dissipation

Optimal switching using coherent control

Coherent optimal control of photosynthetic molecules

F. Caruso,1,2 S. Montangero,3 T. Calarco,3 S. F. Huelga,1 and M. B. Plenio1 1Institut für Theoretische Physik, Universität Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany 2LENS and Dipartimento di Fisica e Astronomia, Università di Firenze, I-50019 Sesto Fiorentino, Italy 3Institut für Quanteninformationsverarbeitung, Universität Ulm, Albert-Einstein-Allee 11, D-89069 Ulm, Germany (Received...

A Simple Theory of Optimal Coherent Control

By combining the theories of optimal control and coherent control, we derive an analytical formulation to evaluate the optimal 1-photon and n-photon fields together with their relative phase and intensity in the optimal “1 + n”-coherent control scheme. The optimal coherent control exploits tailored light pulses to produce the best overlap with a predefined nuclear target in an electronically de...

Cooling of quantum systems through optimal control and dissipation

Coherent control of quantum dynamics is a powerful tool to drive a system towards desired states and to optimize properties of the dynamics. Mature numerical methods exist for the control of non-dissipative dynamics [1– 5]. Similar approaches to open quantum systems are urgently needed and evolving rapidly [6–8]. However, particular care is needed in this case, for which commonly used equations...

Fluctuations and Dissipation of Coherent Magnetization

A quantum mechanical model is used to derive a generalized LandauLifshitz equation for a magnetic moment, including fluctuations and dissipation. The model reproduces the Gilbert-Brown form of the equation in the classical limit. The magnetic moment is linearly coupled to a reservoir of bosonic degrees of freedom. Use of generalized coherent states makes the semiclassical limit more transparent...