(adsbygoogle = window.adsbygoogle || []).push({}); Quantum Mystery #1 - Complimentarity Principle

Hi all - Making sense of the standard double-pinhole experiment is

not easy for the layman! In order for me to better understand complimentarity, an experiment is proposed. What is wrong with this thought experiment? Please view (you may need to scroll horizontally):

http://www.geocities.com/zekise/QuantumMystery-1.htm

The Photon Delay device is just a series of mirrors that reflect the

beam and elongates the path, causing the photon to arrive with a delay.

A single photon is sent to the half mirror and then the full mirror. An

interference pattern should be statistically detected at D, and

visibility of the pattern is V = 1. Assume we record the time t that it takes the photon to travel the path (the difference in the time of emission and absorption).

If t = t_1 (t_1 is measured by replacing M_h by M_f), then we know the

photon has taken path 1. If t = t_2 (t_2 is measured by removing

M_h), then we know the photon has taken path 2. Therefore, the

which-way information is known sharply, and K = 1. This would

contradict the Complimentarity Principle.

Question - What is the value of t (when V = 1)? What is wrong with the picture?

TIA -Zak

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Quantum Mystery #1 - Complementarity Principle

**Physics Forums | Science Articles, Homework Help, Discussion**