Field locked to Fock state by quantum feedback with single photon corrections

Xingxing Zhou 1
1 Michel Brune
LKB (Jussieu) - Laboratoire Kastler Brossel
Abstract : Quantum feedback is a promising tool for preparing and protecting a quantum state. It drives a quantum system towards a target state by the repeated action of a sensorcontroller-actuator loop. Nevertheless its experimental implementation is very challenging, as it must overcome a fundamental difficulty: the sensor measurement causes a random backaction on the system. We have implemented a continuous quantum feedback protocol in the context of cavity quantum electrodynamics. The system to be controlled is a mode of the electromagnetic field confined in a very high finesse microwave cavity in the Fabry-Pérot configuration. Circular Rydberg atoms interacting dispersively with the field serve as sensors. They perform quantum non-demolition measurements of the photon number. Knowing the results of these measurements, and knowing all the experimental imperfections, a classical computer estimates in real time the field state. It then commands the preparation of resonant circular Rydberg atoms to absorb or to emit photons in order to stabilize the field around target Fock state. In this way, we have been able to prepare on demand and protect Fock states containing 1 to 7 photons.
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  • HAL Id : tel-00737657, version 1

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Xingxing Zhou. Field locked to Fock state by quantum feedback with single photon corrections. Quantum Physics [quant-ph]. Université Pierre et Marie Curie - Paris VI, 2012. English. ⟨tel-00737657⟩

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