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

Markus Jerger 1 Pascal Macha 1 Andrés Rosario Hamann 1 Yarema Reshitnyk 2 Kristinn Juliusson 3 Arkady Fedorov 1, 2, * 
* Corresponding author
3 QUANTRONICS - Quantronics Group
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : Binary-outcome measurements allow to determine whether a multi-level 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 non-demolition 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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Markus Jerger, Pascal Macha, Andrés Rosario Hamann, Yarema Reshitnyk, Kristinn Juliusson, et al.. Realization of a Binary-Outcome Projection Measurement of a Three-Level Superconducting Quantum System. Physical Review Applied, American Physical Society, 2016, 6, pp.014014. ⟨10.1103/PhysRevB.86.180504⟩. ⟨cea-01550811⟩



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