Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 13: Transport: Poster Session

TT 13.50: Poster

Monday, March 26, 2012, 15:00–19:00, Poster B

A Superconducting Quantum Register with Multiplexed Readout — •Markus Jerger¹, Stefano Poletto¹, Pascal Macha^1,2, Uwe Hübner², Jürgen Lisenfeld¹, Alexander Lukashenko¹, Evgeni Il’ichev², and Alexey V. Ustinov¹ — ¹Physikalisches Institut, Karlsruhe Institute of Technology, D-76128 Karlsruhe, Germany — ²Institute of Photonic Technology, PO Box 100239, D-07702 Jena, Germany

A resonant circuit coupled to a qubit experiences a shift of its resonance frequency that depends on the quantum state of the qubit. By coupling every qubit to an individual readout resonator, the state of a quantum register of many qubits can be read out through a single transmission line connected to all resonators. The readout of all qubits can be performed simultaneously using digital modulation and de-modulation techniques. We experimentally demonstrate the simultaneous multiplexed readout of up to seven qubits through a single line. We integrated this readout system into a circuit QED architecture consisting of qubits interacting via a quantum cavity bus. Our latest measurements aiming at the demonstration of quantum gates will be presented.