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Delayed-choice quantum eraser with thermal light.

Tao Peng¹, Hui Chen¹, Yanhua Shih¹

¹Department of Physics, University of Maryland, Baltimore County, Baltimore, Maryland 21250, USA.

Physical Review Letters

|May 27, 2014

Summary

This summary is machine-generated.

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A random delayed-choice quantum eraser experiment demonstrates that which-slit information can be erased, even after photon annihilation. This nonlocal interference phenomenon involves random photon pairs interfering with themselves.

Area of Science:

Quantum mechanics
Quantum optics
Wave-particle duality

Background:

Young's double-slit experiment demonstrates wave-like interference.
Which-slit information destroys interference patterns.
Quantum erasers explore the role of information in quantum phenomena.

Purpose of the Study:

To investigate a random delayed-choice quantum eraser.
To determine if which-slit information can be erased by a second photon.
To explore nonlocal interference with random photon pairs.

Main Methods:

Utilized a Young's double-slit interferometer.
Employed thermal light and photon-number fluctuation correlation.
Performed joint measurements on randomly created photon pairs.

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Main Results:

Reappeared interference patterns were observed.
Which-slit information was successfully "erased" by a second photon.
Demonstrated interference with randomly distributed photon pairs.

Conclusions:

Quantum interference can reappear even when which-slit information is seemingly lost.
Nonlocal interference occurs in random photon pairs.
The experiment provides insights into quantum information and entanglement-like phenomena.