Publications by authors named "Maryrose Barrios"
Article Synopsis
- Researchers generated spin-squeezed ground states in an atomic spin-1 Bose-Einstein condensate near a quantum-critical point using a new nonadiabatic technique.
- Unlike traditional methods that create squeezed states through rapid changes, these states are stable over time with a consistent squeezing angle.
- The study achieved 6-8 dB of squeezing and observed that even with a significant loss of atomic density, the squeezing gradually decreased without needing extra decoherence models.
The spin vector of a spin-1 system, unlike that of a spin-1/2 system, can lie anywhere on or inside the Bloch sphere representing the phase space. As a consequence, the geometrical and topological properties of the spin-1 phase space of quantum states are richer and require a generalization of Berry's phase. For special trajectories passing through the center of the Bloch sphere (singular loops), the geometric phase has a non-Abelian nature.
View Article and Find Full Text PDFThe Heisenberg uncertainty principle sets a lower bound on the noise in a force measurement based on continuously detecting a mechanical oscillator's position. This bound, the standard quantum limit, can be reached when the oscillator subjected to the force is unperturbed by its environment and when measurement imprecision from photon shot noise is balanced against disturbance from measurement back-action. We applied an external force to the center-of-mass motion of an ultracold atom cloud in a high-finesse optical cavity and measured the resulting motion optically.
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