quantum physics

New experiment on quantum erasure for advanced physics lab developed

A signature experiment highlighting the wave-particle duality, uncertainty, delayed-choice and quantum computing is developed at the Physlab. It will introduce students to the concepts using classical light from a laser. For more details visit the experiment website here.

By Azeem Iqbal | News

Optical tunneling

Optical tunneling is demonstrated by frustrated total internal reflection.

  • A green laser diode (from a laser pointer) falls on a glass prism. The angle of incidence is greater than a critical angle, resulting in light being totally internal reflection.
  • There is evanescent light leaking from the prism. But this light is difficult to tap off, unless a second prism is placed really close to the first one.
    the second prism is almost conjoined with the first prism using an index matching fluid (Cargille’s BK 7 Matching Liquid).
  • The fluid is able to mate the prisms really well, yet it keeps a small gap between the prisms. Light can tunnel across this classically forbidden region and transmit into the second prism. Total internal reflection has been frustrated.
By Azeem Iqbal | Modern Physics . Quantum Physics


Preparing an institutional and national platform for student-driven experimental research in physics.


Email: physlab.org@gmail.com Telephone: 111-11-LUMS (5867) Address: Lahore University of Management Sciences (LUMS), Sector U, DHA, Lahore Cantt. 54792, Pakistan