Quantum mechanically correlated states and atomic clocks

Jun Ye

Don Monroe

Researchers beat the quantum-mechanical fluctuations in an atomic clock by linking many atoms into an entangled quantum state and pushing the fluctuations into a realm that doesn’t influence the time measurement.

Don Monroe

Researchers beat the quantum-mechanical fluctuations in an atomic clock by linking many atoms into an entangled quantum state and pushing the fluctuations into a realm that doesn’t influence the time measurement.

David J. Wineland, Jonas Bergquist, J. J. Bollinger +2 more

Ian D. Leroux, Monika Schleier-Smith, Vladan Vuletić

Spin squeezing, the generation of collective states of atomic ensembles with reduced spin noise by exploiting non-classical correlations between particles, is a promising approach to overcoming the standard quantum limit set by projection noise of independent atoms. We present two implementations of spin squeezing in ensembles of87Rb confined within an optical resonator, and discuss some of the decoherence mechanisms, both technical and fundamental, that we encounter.