Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 34: TR: Quantum Coherence and Quantum Information Systems 2 (jointly with MA and HL)

TT 34.13: Talk

Wednesday, March 16, 2011, 17:45–18:00, HSZ 03

Monitoring and Markovian Feedback Control of a Solid-state Charge Qubit — •Gerold Kiesslich, Gernot Schaller, and Tobias Brandes — Institut für Theoretische Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin

We investigate theoretically a charge qubit capacitively coupled to a single-electron transistor (SET). A quantum master equation approach [1] is used to address the question how it is possible to continuously monitor the qubit dynamics by SET transport observables. We further demonstrate analytically and numerically the qubit manipulation and control by instantaneous feedback of the SET current into qubit parameters. Feedback-induced qubit rotations and pure states as steady states can be generated.
G. Schaller, G. Kießlich, and T. Brandes, Phys. Rev. B 80, 245107 (2009). ibid. 81, 205305 (2010). ibid. 82, 041303(R) (2010).