Introduction

When photons pass through the double slits, a featured wave pattern that consists of constructive and destructive interferences will be indicated. By the description of quantum mechanics, this is because a photon turns to be a probability wave when moving forward. The constructive interference shows where the photons have high probability to be detected, while the destructive shows where photons are less likely to appear. The purpose of setting up single photon event is to prove that the pattern is the consequence of photon interfering with itself.

Our experiment will focus on the visibility of interference pattern (the obviosity of constructive and destructive parts in interference) in three cases: 1. Classical Young’s double slits experiment. 2. When light passes quantum markers. 3. When light passes both quantum markers and the quantum eraser. The visibility of the third experiment will be identical to the first one if the interference pattern is completely restored; the visibility of the second experiment will be zero if the which-path information of each photon is perfectly marked. This expecting result will be a successful visualization of quantum mechanics.