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Weak measurement based feedback control of atomic ensembles (Orale)

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Atom interferometry based sensors provide today the most precise measurements of time, inertial forces and magnetic fields. In the common approach, a superposition state is interrogated for a given time interval and finally destructively measured. Conversely, we can repeatedly probe non-destructively the same quantum system and demonstrate efficient measurement schemes using feedback. First, we protect a spin polarized atomic ensemble from the decoherence induced by a synthetic noise. After the noise action, the state of the atomic system is read out with negligible projection using a non-destructive probe, and later corrected with a coherent manipulation to restore the initial state. The efficiency of the feedback scheme is studied versus the strength of the measurement and a maximum is found from the trade-off between information gain and probe destructivity. Our feedback controller is then applied to stabilize a classical local oscillator on a collective quantum state, and this is used in an atomic clock configuration to demonstrate experimentally that in some contexts a hybrid phase and frequency lock can surpass conventional atomic clocks which rely only on a frequency lock.
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hal-00995340 , version 1 (23-05-2014)


  • HAL Id : hal-00995340 , version 1


Andrea Bertoldi, Ralf Kohlhaas, Etienne Cantin, Arnaud Landragin, Philippe Bouyer. Weak measurement based feedback control of atomic ensembles (Orale). QMAP 2013 3rd workshop of the Sino-­French Research Network on "Quantum Manipulation of Atoms and Photons" (GDRI QMAP), Sep 2013, Palaiseau, France. ⟨hal-00995340⟩
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