Darmstadt 2008 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 31: Quanteninformation (Konzepte und Methoden I)

Q 31.7: Talk

Thursday, March 13, 2008, 10:00–10:15, 1B

Indirect control of open system dynamics — •Raffaele Romano — Max Planck Research Group, Institute of Optics, Information and Photonics, Staudstr. 7/B2, 91058 Erlangen, Germany

Although conceptually simpler, the standard open loop approach to the control of a quantum mechanical system offers a limited ability to drive the state of the system when the interaction with the external environment cannot be neglected. With this motivation in mind, closed loop approaches have been proposed (quantum feedback). In this contribution, we show that open loop controllability of an open system can be obtained if non standard control scenarios are adopted [1]. In particular, we consider the {\it indirect control} technique [2], based on the use of an auxiliary system whose initial state can be arbitrarily prepared. In our model, the environmental action can be engineered to give complete controllability, and it does not only represent a source of noise and decoherence.

[1] R. Romano, D. D'Alessandro, Phys. Rev. Lett. 97, 080402(2006)

[2] R. Romano, D. D'Alessandro, Phys. Rev. A 73, 022323 (2006)