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Journal Articles Physical Review Letters Year : 2016

Using Spontaneous Emission of a Qubit as a Resource for Feedback Control

Abstract

Persistent control of a transmon qubit is performed by a feedback protocol based on continuous heterodyne measurement of its fluorescence. By driving the qubit and cavity with microwave signals whose amplitudes depend linearly on the instantaneous values of the quadratures of the measured fluorescence field, we show that it is possible to stabilize permanently the qubit in any targeted state. Using a Josephson mixer as a phase-preserving amplifier, it was possible to reach a total measurement efficiency eta = 35%, leading to a maximum of 59% of excitation and 44% of coherence for the stabilized states. The experiment demonstrates multiple-input multiple-output analog Markovian feedback in the quantum regime.
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Origin : Files produced by the author(s)
Origin : Files produced by the author(s)

Dates and versions

hal-01395591 , version 1 (11-11-2016)

Identifiers

Cite

Philippe Campagne-Ibarcq, Sébastien Jezouin, Nathanaël Cottet, Pierre Six, Landry Bretheau, et al.. Using Spontaneous Emission of a Qubit as a Resource for Feedback Control. Physical Review Letters, 2016, 117, pp.060502. ⟨10.1103/PhysRevLett.117.060502⟩. ⟨hal-01395591⟩
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