Physics – Quantum Physics
Scientific paper
2010-05-31
Nature Physics 5 (2009) 791
Physics
Quantum Physics
Scientific paper
10.1038/nphys1400
The future development of quantum information using superconducting circuits requires Josephson qubits with long coherence times combined to a high-delity readout. Major progress in the control of coherence has recently been achieved using circuit quantum electrodynamics (cQED) architectures, where the qubit is embedded in a coplanar waveguide resonator (CPWR) which both provides a well controlled electromagnetic environment and serves as qubit readout. In particular a new qubit design, the transmon, yields reproducibly long coherence times. However, a high-delity single-shot readout of the transmon, highly desirable for running simple quantum algorithms or measuring quantum correlations in multi-qubit experiments, is still lacking. In this work, we demonstrate a new transmon circuit where the CPWR is turned into a sample-and-hold detector, namely a Josephson Bifurcation Amplifer (JBA), which allows both fast measurement and single-shot discrimination of the qubit states. We report Rabi oscillations with a high visibility of 94% together with dephasing and relaxation times longer than 0.5 $\mu$s. By performing two subsequent measurements, we also demonstrate that this new readout does not induce extra qubit relaxation.
Bertet Patrice
Esteve Daniel
Mallet Francois
Nguyen François
Ong Florian R.
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