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Dresden 2003 – scientific programme

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SYQI: Quantum information processing in condensed media

SYQI 2: Quantum information processing in condensed media II

SYQI 2.5: Talk

Monday, March 24, 2003, 17:00–17:15, HSZ/01

Time-resolved observation of macroscopic quantum tunneling in a Josephson junction — •Jürgen Lisenfeld1, Alexandr Lukashenko1, Christian Coqui1, Alexander Kemp1, Fistul Misha1, Andreas Wallraff2, and Alexey Ustinov11Physikalisches Institut III / Universität Erlangen — 2Department of Applied Physics / University of Yale, New Haven

We present experimental results on direct life time measurements of a metastable state in a Josephson junction. The technique that we use allows to monitor in the time domain the switching probability of the junction to a resistive state. At milikelvin temperatures this process occurs by macroscopic quantum tunneling through a potential barrier and follows an exponential decay law, as observed in our experiment. The setup used in these measurements allows both coherent manipulating and reading out the quantum state of the junction. A single Josephson junction can be operated as a qubit by applying sequences of microwave and dc pulses.

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