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TT: Fachverband Tiefe Temperaturen

TT 44: Transport: Quantum Coherence and Quantum Information

TT 44.14: Talk

Thursday, March 26, 2009, 17:45–18:00, HSZ 304

Mesoscopic Shelving Readout of Superconducting Qubits in Circuit QED — •Jens Siewert¹, Barbara Englert^2,3, Giuseppe Mangano^1,4, Matteo Mariantoni³, Rudolf Gross³, and Enrique Solano^2,5 — ¹University of Regensburg, 93040 Regensburg, Germany — ²LMU München, 80333 München, Germany — ³TU München und Walther-Meißner Institut, 85748 Garching, Germany — ⁴DMFCI, Università di Catania, 95125 Catania, Italy — ⁵University of the Basque Country, 48080 Bilbao, Spain

We present a method for measuring the state of a superconducting qubit inside a microwave cavity, where one qubit state is associated with the generation of a mesoscopic cavity coherent field while the other remains associated with a vacuum field. By measuring the outgoing cavity field with conventional devices, an efficient detection of the qubit state can be achieved. This method uses a cyclic transition in a three-level artificial atom configuration to build the large cavity field, enabling a high-fidelity measurement in the spirit of the successful electron-shelving readout for trapped ions. We expect that the proposed technique can be adapted to different superconducting qubit designs and contribute to further improve qubit readout fidelity.