Effects of a phase shift on two-photon process

M. M. Ashraf

M. M. Ashraf

The effects of Stark shift on the probability amplitudes of N two-level atoms involved in two-photon transitions with the N th atom undergoing phase shift, are investigated. Results show that under certain physical conditions, a photon pair can be trapped and released periodically. Due to complete energy exchange, a photon pair (after phase shift) exhibits an almost mirror image of an atom pair (before phase shift). Moreover, the population after phase shift seems to be localized by clamping the photon pair. For a larger number of atoms, the population is trapped periodically. The trapped time varies with N and the probability amplitudes with 1/ N .

Boyun Wang, Tao Wang, Jian Tang +2 more

We propose phase shift multiplication effect of all-optical analog to electromagnetically induced transparency in two photonic crystal micro-cavities side coupled to a waveguide system through external optical pump beams. With dynamically tuning the propagation phase of the line waveguide, the phase shift of the transmission spectrum in two micro-cavities side coupled to a waveguide system is doubled along with the phase shift of the line waveguide. π-phase shift and 2π-phase shift of the transmission spectrum are obtained when the propagation phase of the line waveguide is tuned to 0.5π-phase shift and π-phase shift, respectively. All observed schemes are analyzed rigorously through finite-difference time-domain simulations and the coupled-mode formalism. These results show a new direction to the miniaturization and the low power consumption of microstructure integration photonic devices in optical communication and quantum information processing.

J. D. Franson, T. B. Pittman

Steven Sagona-Stophel, Dounan Du, Eden V. Figueroa

We investigate how a simple room-temperature Rb cell can exhibit both linear and nonlinear quantum processes and achieve a number of benchmarks toward two-photon gate operation, including large photon-photon phase shifts at high-fidelity and optimizing an EIT-enhanced effective χ2 nonlinearity.