Atom interferometry with quantized light pulses

Area of Science:

• Quantum optics
• Atom interferometry
• Quantum information

Background:

• Far-field diffraction patterns of atoms are identical for classical light and quantum photon-number states.
• Diffraction from coherent states, despite similarities to classical light, exhibits distinct behavior.

Purpose of the Study:

• To investigate the behavior of atom interferometers using light-pulse beam splitters and mirrors in intense coherent states.
• To analyze the impact of low photon numbers and quantum information on interference visibility.

Main Methods:

• Theoretical analysis of atom diffraction and interference.
• Comparison of atom interferometer signals in coherent states versus classical fields.
• Examination of effects in single photon-number states and superpositions.

Main Results:

• Atom interferometer interference signals in intense coherent states approach classical field limits.
• Low photon numbers in coherent states reveal light's granular structure.
• Quantum 'which-way' information encoded in the field reduces interference visibility.

Conclusions:

• Coherent states in atom interferometry can mimic classical light behavior under high intensity.
• The quantum nature of light, particularly at low photon counts, fundamentally impacts interference visibility.
• Understanding these quantum effects is crucial for advanced atom interferometry applications.