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Dr. Mandip Singh

Profession: Physicist (Asst. Professor of Physics),  Indian Institute of Science Education and Research Mohali, India.

 Independent research group leader.


Research Interests:  Quantum Physics:   Quantum entanglement,  Hybrid quantum systems, Foundations of quantum physics, BEC & quantum technology experiments and connection of relativity with quantum physics.


Photon Experiments

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Experiments of Photon Entanglement

Quantum entangled state cannot be written in a product form even if individual particles are separated. Research on quantum entangled photons and foundations of quantum mechanics is one of the main area of research of Dr. Mandip Singh .  


We have performed a new experiment to produce position-momentum entangled states of two photons. Quantum diffraction of position-momentum entangled photons from a sharp edge is experimentally observed in his lab. Experimental results are understood based on a continuous variable entanglement quantum model.  This is the first experiment on quantum diffraction of entangled photons from a sharp edge that involves continuous variable entanglement. For details: Phys. Letts. A. 383, 125889, (2019).


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Quantum diffraction from a sharp edge

An observed diffraction pattern of position-momentum entangled photons. Solid line plot represents a plot generated by  continuous variable entanglement model.

Selected Research

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Macroscopic quantum entanglement

Fields are quantum of nature and particles are energy excitation of a  field. Quantum superposition of magnetic field can produce interesting quantum states of interacting BEC. One such quantum state is a macroscopic  entanglement of path of a single Bose Einstein condensate. Quantum magnetic field can produce macroscopic quantum entanglement  of BEC. 

Further details: Mandip Singh, Phys. Rev. A. 95, 043620, (2017)

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Macroscopic quantum system

  Displacement of a close loop superconducting cantilever is coupled with the net magnetic flux linked to the loop. Its ground state has features of quantum entanglement. Coupling constant of cantilever displacement with the net magnetic flux depends on the external magnetic field. In this way, coupling can be controlled externally and  quantum entanglement of macroscopic quantum variables can be produced.  Mandip Singh, Phys. Letts A. 370, 2001-2006 (2015).

Phase space Imaging Experiment

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3D Tomographic imaging of a phase space pattern

Patterns in phase space cannot be imaged with a lens and eye. This research is about imaging of a pattern localised in a phase space. A part of the experiment on a three-dimensional tomographic imaging of a phase space pattern is shown on left. 

For details: Phys. Rev. A, 98, 053828 (2018).

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Concept

Concept of a 3D tomographic imaging of a pattern in phase space  (a). 

(d) velocity selective hole-burning and 

(c) a spatial domain image. 

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Phase Space Tomographic Imaging

 Schematic  diagram of experiment.

phy-edu

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Experiment of diffraction of laser beam from moving sharp edges is featured on the cover page of American Journal of Physics, June 2018. 

Diffraction effects in mechanically chopped laser pulses. S. Gambhir and M. Singh, 86, 406, (2018).

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Nonlinearity of PN junction diode.

This experiment shows all orders of nonlinearity of a PN junction diode.  Harmonic generation, sum difference frequency generation, frequency comb  generation up to the twentieth harmonic by a single PN junction. (IAPT Physics Education,Vol 32, 2, Apr-Jun 2018, ISSN: 0970-5953.)

Frequency comb generation up to twentieth harmonic of the fundamental driving voltage.

Frequency comb generation by a PN junction diode

A frequency comb generated by using nonlinearity of a PN junction diode. Highest frequency is the twentieth harmonic of the driving voltage. Published in IAPT physics education, Apr-Jun 2018.