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Weak measurement based feedback control of atomic ensembles (Orale)
KOHLHAAS, Ralf
Systèmes de Référence Temps Espace [SYRTE]
Laboratoire Charles Fabry / Optique atomique
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Systèmes de Référence Temps Espace [SYRTE]
Laboratoire Charles Fabry / Optique atomique
KOHLHAAS, Ralf
Systèmes de Référence Temps Espace [SYRTE]
Laboratoire Charles Fabry / Optique atomique
Systèmes de Référence Temps Espace [SYRTE]
Laboratoire Charles Fabry / Optique atomique
LANDRAGIN, Arnaud
Laboratoire national de métrologie et d'essais - Systèmes de Référence Temps-Espace [LNE - SYRTE]
< Reduce
Laboratoire national de métrologie et d'essais - Systèmes de Référence Temps-Espace [LNE - SYRTE]
Language
en
Communication dans un congrès avec actes
This item was published in
QMAP 2013 3rd workshop of the Sino-French Research Network on "Quantum Manipulation of Atoms and Photons" (GDRI QMAP), 2013-09-23, Palaiseau.
English Abstract
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 ...Read more >
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.Read less <
Origin
Hal imported