"Non-classical" atom optics

Christian Kurtsiefer, R. J. C. Spreeuw, Michael Drewsen +2 more

Qi-Liang He, Jian Colin Sun, Song Xiao-Shu +1 more

Taking the advantage of “parity kicks” pulses, we investigate the non-classical correlation dynamics and quantum state transfer in an atom–cavity–fiber system, which consists of two identical subsystems, each subsystem comprising of multiple two-level atoms trapped in two remote single-model optical cavities that are linked by an optical fiber. It is found that the non-classical correlations and the fidelity of quantum state transfer (between the atoms) can be greatly improved by the parity kicks pulses. In particular, with decrease of the time intervals between two consecutive pulses, perfect non-classical correlation transfer and entangled state transfer can be achieved.

Simon Bernon, Thomas Vanderbruggen, Ralf Kohlhaas +3 more

We report on a novel experiment to generate non-classical atomic states via quantum non-demolition (QND) measurements on cold atomic samples prepared in a high-finesse ring cavity. The heterodyne technique developed for QND detection exhibits an optical shot-noise limited behavior for local oscillator optical power of a few hundred μW, and a detection bandwidth of several GHz. This detection tool is used in a single pass to follow non-destructively the internal state evolution of an atomic sample when subjected to Rabi oscillations or a spin-echo interferometric sequence.

S. L. Rolston, William D. Phillips

Zhihui Yan, Liang Wu, Yanhong Liu +4 more

We have deterministically generated tripartite polarization entangled optical fields by means of three optical parametric amplifiers and beam splitters, and investigated interaction between non-classical light and atomic ensembles for quantum networks.