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, Arkady Fedorov
DOI 10.1103/PhysRevApplied.6.014014 · Physical Review Applied
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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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