Towards A Quantum Memory For Non-Classical Light With Cold Atomic Ensembles

Abstract : A reversible quantum memory allowing us to store and retrieve quantum information serves as a key necessity for implementing many of novel quantum information protocols. As light serves as a reliable long-range carrier of quantum information, and atoms offer the possibility of long storage times, current attempts at creating quantum memories focus on the transfer of the quantum fluctuations of light onto atomic coherences. The work in this thesis focuses on the development of a quantum memory for squeezed light using an ensemble of cold Cesium atoms stored in a magneto-optical trap. Our two major milestones were the development of a source of nonclassical light, and the development of a suitable atomic medium for storage. We first present the results of our efforts to generate a source of squeezed vacuum states resonant with the Cesium D2 line using a PPKTP nonlinear crystal inside of an optical parametric oscillator. Additionally, we characterize these squeezed states by carrying out a quantum state tomography using an iterative maximum likelihood approach. Next we look at the development of a new experiment which would allow us to use cold Cesium atoms as a storage medium in our recently developed magneto-optical trap. As this requires an array of novel tools and experimental techniques, we will discuss the development of these elements, and how they have furthered our progress towards storing quantum states onto our Cesium atoms, and eventually entangling two atomic ensembles.
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Contributor : Sidney Burks <>
Submitted on : Sunday, May 20, 2012 - 10:35:43 AM
Last modification on : Friday, March 22, 2019 - 1:31:50 AM
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  • HAL Id : tel-00699270, version 1


Sidney Burks. Towards A Quantum Memory For Non-Classical Light With Cold Atomic Ensembles. Quantum Physics [quant-ph]. Université Pierre et Marie Curie - Paris VI, 2010. English. ⟨tel-00699270⟩



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