Realization of a Binary-Outcome Projection Measurement of a Three-Level Superconducting Quantum System

Markus Jerger, Pascal Macha, Andrés Rosario Hamann, Yarema Reshitnyk, Kristinn Juliusson, and Arkady Fedorov
Phys. Rev. Applied 6, 014014 – Published 25 July 2016

Abstract

Binary-outcome measurements allow one to determine whether a multilevel quantum system is in a certain state while preserving quantum coherence between all orthogonal states. In this paper, we explore different regimes of the dispersive readout of a three-level superconducting quantum system coupled to a microwave cavity in order to implement binary-outcome measurements. By designing identical cavity-frequency shifts for the first and second excited states of the system, we realize strong projective binary-outcome measurements onto its ground state with a fidelity of 94.3%. Complemented with standard microwave control and low-noise parametric amplification, this scheme enables the quantum nondemolition detection of leakage errors and can be used to create sets of compatible measurements to reveal the contextual nature of superconducting circuits.

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  • Received 12 November 2015

DOI:https://doi.org/10.1103/PhysRevApplied.6.014014

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Markus Jerger, Pascal Macha, and Andrés Rosario Hamann

  • ARC Centre of Excellence for Engineered Quantum Systems, The University of Queensland, Brisbane, Queensland 4072, Australia

Yarema Reshitnyk

  • School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia

Kristinn Juliusson

  • Quantronics, SPEC, CEA Saclay, 91191 Gif-sur-Yvette Cedex, France

Arkady Fedorov*

  • ARC Centre of Excellence for Engineered Quantum Systems, The University of Queensland, Brisbane, Queensland 4072, Australia and School of Mathematics and Physics, The University of Queensland, Brisbane, Queensland 4072, Australia

  • *a.fedorov@uq.edu.au

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Vol. 6, Iss. 1 — July 2016

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