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Large cross-phase modulation between slow copropagating weak pulses in 87Rb.

Zeng-Bin Wang¹, Karl-Peter Marzlin, Barry C Sanders

¹Institute for Quantum Information Science, University of Calgary, Calgary, Alberta T2N 1N4, Canada.

Physical Review Letters

|October 10, 2006

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We demonstrate a method for creating double electromagnetically induced transparency and optimal cross-phase modulation using slow light pulses in 87Rb atoms. This technique utilizes a single pump laser and magnetic field for precise control of light-matter interactions.

Area of Science:

Atomic physics
Quantum optics
Nonlinear optics

Background:

Electromagnetically induced transparency (EIT) enables control over light propagation in atomic media.
Cross-phase modulation (XPM) is crucial for all-optical switching and signal processing.
Achieving matched group velocities for multiple light pulses is challenging but essential for nonlinear optical phenomena.

Purpose of the Study:

To propose a scheme for generating double EIT and optimal XPM.
To enable the interaction of two slow, copropagating pulses with matched group velocities.
To utilize a single species of atom, 87Rb, for these effects.

Main Methods:

Employing a single pump laser to create the EIT conditions.
Utilizing a homogeneous magnetic field to mitigate cancellation effects via the nonlinear Zeeman effect.

Related Experiment Videos

Developing a feasible atomic initial state preparation procedure to ensure matched group velocities for signal fields.

Main Results:

Demonstration of a scheme for generating double EIT.
Achieving optimal cross-phase modulation for two slow, copropagating pulses.
Successful matching of group velocities for the signal fields in 87Rb atoms.

Conclusions:

The proposed scheme offers a viable method for controlling light propagation and nonlinear interactions in atomic systems.
The use of a single pump laser and magnetic field simplifies the experimental setup.
The suggested atomic state preparation is feasible for achieving the desired matched group velocities.