Dr. Collin M. Trail Profile

Dr. Collin M. Trail

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Proceedings Article | 29 March 2013 Paper

Coupling of quantum fluctuations in a two-component condensate

Collin Trail, Barry Sanders

Proceedings Volume 8635, 863517 (2013) https://doi.org/10.1117/12.2005620

KEYWORDS: Neodymium, Electroluminescent displays, Chemical species, Transparency, Nonlinear optics, Quantum memory, Systems modeling, Photonics, Quantum computing, Current controlled current source

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We model frozen light stored as a spin wave via electromagnetically induced transparency quantum-memory techniques in a Bose-Einstein condensate. The joint evolution of the condensate and the frozen light is typically modeled using coupled Gross-Pitaevskii equations for the two atomic fields, but these equations are only valid in the mean-field limit. Even when the mean-field limit holds for the host condensate, coupling between the host and the spin wave component could lead to a breakdown of the mean-field approximation if the host fluctuations are large compared the mean-field value of the spin wave. We develop a theoretical framework for modeling the corrections to the mean-field theory of a two-component condensate. Our analysis commences with a full second-quantized Hamiltonian for a two-component condensate. The field operators are broken up into a mean-field and a quantum fluctuation component. The quantum fluctuations are truncated to lowest non-vanishing order. We find the transformation diagonalizing the second-quantized approximate Hamiltonian and show that it can be described using the solutions to a system of coupled differential equations.

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