Title :
Spin-squeezing of a large-spin system via QND measurement DRAFT
Author :
Sewell, R.J. ; Koschorreck, M. ; Napolitano, M. ; Dubost, B. ; Behbood, N. ; Mitchell, M.W.
Author_Institution :
ICFO-Inst. de Cienc. Fotoniques, Castelldefels, Spain
Abstract :
We demonstrate spin squeezing and entanglement in a large-spin system via quantum non-demolition measurement. We make non-destructive, projection-noise-limited collective spin measurements on an ensemble of up to in 8.4 × 105 laser-cooled 87Rb atoms in the f = 1 hyperfine ground state. A dynamically-decoupled probing scheme [Phys. Rev. Lett. 105, 093602 (2010)] prevents probe-induced decoherence. Repeated measurements show correlations beyond the standard quantum limit, indicating generation of a spin-squeezed state with up to -3.6 dB of noise reduction and -2.6 dB of metrologically-relevant squeezing.
Keywords :
atom-photon collisions; ground states; hyperfine structure; laser cooling; optical squeezing; quantum entanglement; rubidium; DRAFT; QND; Rb; dynamically-decoupled probing scheme; hyperfine ground state; large-spin system; laser-cooled atoms; metrologically-relevant squeezing; noise reduction; nondestructive method; probe-induced decoherence; projection-noise-limited collective spin measurements; quantum nondemolition measurement; spin entanglement; spin-squeezing; Atomic beams; Atomic measurements; Cascading style sheets; Magnetometers; Noise; Noise measurement; Quantum entanglement;
Conference_Titel :
Lasers and Electro-Optics (CLEO), 2012 Conference on
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4673-1839-6
