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Quantum Optics and Entanglement Lab

Prof. Anand K. Jha

Department of Physics, IIT Kanpur

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Outreach

25-July-2025
05-Nov-2023
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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]