Skip to Main content Skip to Navigation
Journal articles

Single-shot qubit readout in circuit Quantum Electrodynamics

François Mallet 1 Florian R. Ong 1 Agustin Palacios-Laloy 1 François Nguyen 1 Patrice Bertet 1 Denis Vion 1 Daniel Estève 1
1 QUANTRONICS - Quantronics Group
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : 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 µs. By performing two subsequent measurements, we also demonstrate that this new readout does not induce extra qubit relaxation.
Complete list of metadata

Cited literature [23 references]  Display  Hide  Download
Contributor : Agustin Palacios-Laloy <>
Submitted on : Wednesday, April 28, 2010 - 10:18:17 AM
Last modification on : Friday, March 5, 2021 - 3:09:13 PM


Files produced by the author(s)




François Mallet, Florian R. Ong, Agustin Palacios-Laloy, François Nguyen, Patrice Bertet, et al.. Single-shot qubit readout in circuit Quantum Electrodynamics. Nature Physics, Nature Publishing Group, 2009, 5, pp.791. ⟨10.1038/nphys1400⟩. ⟨hal-00440277v2⟩



Record views


Files downloads