Squeezed spin states possess unique quantum correlation or entanglement and are significantly promising for advancing quantum information processing and quantum metrology. In recent back-to-back publications [C. Gross , Nature (London) 464, 1165 (2010)NATUAS0028-083610.1038/nature08919 and Max F. Riedel , Nature (London) 464, 1170 (2010)NATUAS0028-083610.1038/nature08988], reduced spin fluctuations are observed leading to spin squeezing at -8.2 and -2.5dB, respectively, in two-component atomic condensates exhibiting one-axis-twisting interactions. The noise reduction limit for the one-axis twisting scales as ∝1/N2/3, which for a condensate with Ñ103 atoms is about 100 times below the standard quantum limit. We present a scheme using repeated Rabi pulses capable of transforming the one-axis-twisting spin squeezing into the two-axis-twisting type, leading to Heisenberg limited noise reduction ∝1/N or an extra tenfold improvement for Ñ103.
Physical Review Letters
- Pub Date:
- July 2011
- Quantum optics;
- Entanglement and decoherence in Bose-Einstein condensates;
- Condensed Matter - Quantum Gases
- 4 pages, 3 figures