Ultrafast quantum nondemolition measurements based on a diamond-shaped artificial atom

I. Diniz, E. Dumur, O. Buisson, and A. Auffèves
Phys. Rev. A 87, 033837 – Published 28 March 2013

Abstract

We propose a quantum nondemolition (QND) readout scheme for a superconducting artificial atom coupled to a resonator in a circuit QED architecture, for which we estimate a very high measurement fidelity without Purcell effect limitations. The device consists of two transmons coupled by a large inductance, giving rise to a diamond-shaped artificial atom with a logical qubit and an ancilla qubit interacting through a cross-Kerr-like term. The ancilla is strongly coupled to a transmission line resonator. Depending on the qubit state, the ancilla is resonantly or dispersively coupled to the resonator, leading to a large contrast in the transmitted microwave signal amplitude. This original method can be implemented with a state-of-the-art Josephson parametric amplifier, leading to QND measurements in a few tens of nanoseconds with fidelity as large as 99.9%.

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  • Received 18 July 2012

DOI:https://doi.org/10.1103/PhysRevA.87.033837

©2013 American Physical Society

Authors & Affiliations

I. Diniz, E. Dumur, O. Buisson, and A. Auffèves

  • Institut Néel, CNRS–Université Joseph Fourier, Boîte Postale 166, 38042 Grenoble Cedex 9, France

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Issue

Vol. 87, Iss. 3 — March 2013

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