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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

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1

Relative number squeezing in a Spin-1 Bose-Einstein condensate

Bookjans, Eva M. 15 November 2010 (has links)
The quantum properties of matter waves, in particular quantum correlations and entanglement are an important frontier in atom optics with applications in quantum metrology and quantum information. In this thesis, we report the first observation of sub-Poissonian fluctuations in the magnetization of a spinor 87Rb condensate. The fluctuations in the magnetization are reduced up to 10 dB below the classical shot noise limit. This relative number squeezing is indicative of the predicted pair-correlations in a spinor condensate and lay the foundation for future experiments involving spin-squeezing and entanglement measurements. We have investigated the limits of the imaging techniques used in our lab, absorption and fluorescence imaging, and have developed the capability to measure atoms numbers with an uncertainly < 10 atoms. Condensates as small as ≈ 10 atoms were imaged and the measured fluctuations agree well with the theoretical predictions. Furthermore, we implement a reliable calibration method of our imaging system based on quantum projection noise measurements. We have resolved the individual lattice sites of a standing-wave potential created by a CO2 laser, which has a lattice spacing of 5.3 µm. Using microwaves, we site-selectively address and manipulate the condensate and therefore demonstrate the ability to perturb the lattice condensate of a local level. Interference between condensates in adjacent lattice sites and lattice sites separated by a lattice site are observed.
CO2 laser lattice potential
Resolving lattice sites
Addressing single lattice sites
Atom interference
Spin-mixing
Small atom numbers
Absorption imaging
Fluorescence imaging
Relative number squeezing
Sub-Poissonian fluctuations
Magnetization
Spinor BEC
Bose-Einstein condensate
CO2 laser optical dipole trap
Imaging noise
Number fluctuations
Lattice potential
Quantum projection noise
Atom pair correlations
Imaging calibration
Photon shot noise
Bose-Einstein condensation
Quantum optics
Squeezed light

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