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

Philippe Campagne-Ibarcq 1, 2 Sébastien Jezouin 1, 2 Nathanaël Cottet 1, 2 Pierre Six 3, 4 Landry Bretheau 2 François Mallet 1, 2 Alain Sarlette 1 Pierre Rouchon 3 Benjamin Huard 4, 2
1 QUANTIC - QUANTum Information Circuits
ENS Paris - École normale supérieure - Paris, Inria Paris-Rocquencourt, UPMC - Université Pierre et Marie Curie - Paris 6, MINES ParisTech - École nationale supérieure des mines de Paris, CNRS - Centre National de la Recherche Scientifique : UMR8551
4 QUANTIC - QUANTum Information Circuits
ENS Paris - École normale supérieure - Paris, UPMC - Université Pierre et Marie Curie - Paris 6, MINES ParisTech - École nationale supérieure des mines de Paris, Inria de Paris
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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Submitted on : Friday, November 11, 2016 - 1:31:01 AM
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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, American Physical Society, 2016, 117, pp.060502. ⟨10.1103/PhysRevLett.117.060502⟩. ⟨hal-01395591⟩

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