Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 23: Poster 2: Intersectional Session
Q 23.36: Poster
Dienstag, 15. März 2011, 18:00–21:00, P1
Direct Characterization of Quantum Dynamics in a system of 40Ca+ - ions — •Daniel Nigg1, Julio T. Barreiro1, Philipp Schindler1, Thomas Monz1, Michael Chwalla1,2, Stefan Quint1, Markus Hennrich1, and Rainer Blatt1,2 — 1Institut für Experimentalphysik, Universität Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria — 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Technikerstr. 21A, 6020 Innsbruck, Austria
Quantum process tomography (QPT) is an essential tool for characterizing a process in quantum information processing. Standard QPT requires a large number of measurements for various input states and measurement bases of the respective quantum system. Direct characterization of quantum dynamics (DCQD) can significantly reduce the number of measurements [1]. The process acting on a single qubit is characterized by entangling it initially with an auxiliary qubit and performing Bell-state measurements on the joint final state. An experimental realization of DCQD is reported in a system of 40Ca+ ions confined in a linear Paul trap. The unitary processes σX,Y,Z as well as phase and amplitude damping are characterized on a single qubit. DCQD allows determining the longitudinal and transversal relaxation times T1 and T2 of one or two qubits in a single measurement. Thus the system’s spontaneous decay time (T1) and dephasing time (T2) are quantitatively analysed with a single experimental setting.
[1] M. Mosheni and D. A. Lidar, Phys. Rev. Lett., 97:1-4, (2006).