Manipulating light pulses via dynamically controlled photonic band gap.

Area of Science:

• Atomic, Molecular, and Optical Physics
• Quantum Optics
• Quantum Information Science

Background:

• Electromagnetically induced transparency (EIT) allows light propagation in otherwise opaque atomic media.
• Modulating EIT resonances with light waves can create frequency bands where light propagation is forbidden (band gaps).

Purpose of the Study:

• To investigate the dynamic control of light propagation using electromagnetically induced transparency (EIT) band gaps.
• To demonstrate the coherent conversion of propagating light pulses into stationary excitations.
• To explore applications in quantum nonlinear optics and quantum information.

Main Methods:

• Utilizing an atomic ensemble exhibiting EIT.
• Modulating the EIT resonance with an off-resonant standing light wave to create a tunable band gap.
• Applying dynamic control to the band gap to manipulate light pulse propagation.

Main Results:

• A controllable band gap was created, forbidding light propagation within specific frequencies.
• Propagating light pulses were coherently converted into stationary excitations with a non-vanishing photonic component.
• High efficiency and negligible noise were achieved, even at the few-photon level.

Conclusions:

• Dynamic control of EIT-induced band gaps offers a novel method for light pulse manipulation.
• This technique facilitates the creation of stationary photonic excitations.
• The findings have significant implications for quantum nonlinear optics and quantum information processing.