Observation of electromagnetically induced transparency for a squeezed vacuum with the time domain method

Area of Science:

• Quantum Optics
• Atomic Physics
• Quantum Information Science

Background:

• Squeezed states of light are crucial for quantum technologies.
• Interactions with atomic media can degrade quantum states.
• Achieving lossless propagation of quantum states in atomic systems is a significant challenge.

Purpose of the Study:

• To investigate the transmission of squeezed vacuum light through cold atomic ensembles.
• To demonstrate lossless propagation of quantum states in a magneto-optical trap.
• To explore the application of electromagnetically induced transparency (EIT) for quantum state preservation.

Main Methods:

• Injection of a probe light in a squeezed vacuum state into cold 87Rb atoms.
• Use of an intense control light in a coherent state to induce EIT.
• Monitoring the transmitted squeezed vacuum using a time-domain homodyne detection technique.

Main Results:

• A sub-MHz transparency window was successfully created in the cold atomic medium.
• The squeezed vacuum light propagated through the cold 87Rb atoms without significant optical loss.
• Lossless transmission was confirmed via precise time-domain homodyne measurements.

Conclusions:

• Electromagnetically induced transparency enables lossless propagation of squeezed vacuum states in cold atomic ensembles.
• This technique offers a promising pathway for preserving quantum information in atomic systems.
• The demonstrated method is vital for advancing quantum communication and quantum sensing technologies.