Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 6: Transport: Quantum Coherence and Quantum Information Systems - Theory I

TT 6.5: Talk

Monday, March 31, 2014, 12:00–12:15, HSZ 204

Optimizing quantum measurements in circuit QED — •Daniel Egger and Frank Wilhelm — Universität des Saarlandes, Saarbrücken, Deutschland

Manipulating quantum systems requires knowing the shape of the control pulses to achieve a desired state or specified time evolution. Optimal control is the framework in which the pulses are designed. Typically such pulses are optimal with respect to time and can be found through a gradient search [1]. In superconducting qubits these methods have been applied to gate design , usually in an idealised unitary process [2,3]. In this work we instead focus on optimizing the time evolution of systems where non-unitary processes are the source for the desired time evolution. As example we consider a measurement process in circuit QED where a “click” of the detector corresponds to a tunneling event and find control pulses that optimize a contrast. We first analyze the standard phase qubit readout, we then evaluate its generalization to the JBA.
N. Khaneja et al., J. Magn. Reson. 172, 296
R. Schutjens et al., Phys. Rev. A 88, 052330
D. J. Egger & F. K. Wilhelm, Supercond. Sci. Technol. 27, 014001