Lab logo

Quantum Optics and Entanglement Lab

Prof. Anand K. Jha

Department of Physics, IIT Kanpur

New logo

Courses


Lectures on Quantum Entanglement (Very Basics)

(Delivered by Anand Jha as part of the TEQIP IIT Kanpur course on basic physics)


Resources:

YouTube channel of the quantum optics and entanglement lab

Web-App for simulating parametric down-conversion (downloading not needed)

Dancing Photons:

This video is recorded by an EMCCD camera at the single-photon level. The Figure consists of a few thousand photons (individual dots in the picture). The source is an attenuated HeNe laser and the double-slit is realized using an SLM. (Video credits: Lavanya Taneja and Rishabh Sahu)

Single-photon interference in a Youngs double-slit experiment:

This video is the classic Young double-slit experiment performed with single photons. The source is a highly attenuated HeNe laser and the interference is recorded using an EMCCD camera, at the rate of less than a photon per frame. (Video credits: Lavanya Taneja)

Interference of single photons having orbital angular momentum:

In this experiment, a photon is in the superposition state of having orbital angular momentum values of either +4ℏ or -4ℏ . The source is a highly attenuated HeNe laser and the interference is recorded using an EMCCD camera, at the rate of less than a photon per frame. (Video credits: Lavanya Taneja)

Fun with light:

This is the far-field pattern of a laser beam reflecting off of a dynamic aperture. The dynamic aperture is realised using a spatial light modulator and the far field intensity is captured using a CCD camera. (Video credits: Rishabh Sahu)


Presentations:

(given by the lab members at national/international conferences/workshops)

  1. Measurement of two-photon position-momentum EPR correlation using a single multi-pixel camera; given by Abhinandan Bhattacharjee @ PRL, Ahmedabad. [YouTube Video]
  2. Efficient measurement of high-dimensional quantum states; given by Anand Jha @TIFR, Mumbai, India April 2018. [PDF]
  3. Transfer of Quantum Correlations from One-Photon Systems to Entangled Two-Photon Systems; given by Anand Jha @ Photonics 2018, Kanpur, India. [ PDF]
  4. Entangled Photons. given by Anand Jha @ Light Matter Interaction 2014. IACS, Kolkata, India. [PDF]
  5. Quantum Superposition, Quantum Entanglement, and Quantum Technologies; given by Anand Jha @ Horizon Lecture, Kanpur, India, Jan 2014. [PDF]
  6. Two-photon fields: Coherence, Interference, and Entanglement; given by Anand Jha @ PRL, Ahmedabad, India, June 2013. [PDF]
  7. Orbital Angular Momentum: Interference, Entanglement, and Precision Measurement; given by Anand Jha @ PQE, Snowbird, USA, Jan 2011. [PDF]
  8. Coherence properties of the entangled two-photon field produced by PDC; given by Anand Jha @ IQC, Waterloo, Canada, Jan 2010. [PDF]