Quantum Physics:
Quantum Foundations
Quantum Entanglement
Photon Experiments
Hybrid Quantum Systems
Quantum Physics:
Quantum Foundations
Quantum Entanglement
Photon Experiments
Hybrid Quantum Systems
Dr. Mandip Singh
Profession:
Physicist (Associate Professor of Physics) and independent research group leader,
Indian Institute of Science Education and Research (IISER) Mohali, India.
Research Interests:
Quantum Physics: Foundations of quantum physics, Quantum entanglement,
Quantum information processing and quantum imaging,
Hybrid quantum systems, BEC & quantum technology experiments.
and general physics.
Research is funded by Department of Science and Technology (DST).
Principle investigator and lead scientist of an independent research project, Quantum Enabled Science and Technology scheme.
Brief Introduction
Main research focus of Dr. Mandip Singh at present is on foundations of quantum physics, quantum optics, quantum information processing and quantum imaging. He is mainly doing research experiments with quantum entangled photons and single photons on interesting ideas and concepts. He has supervised and supervising PhD students on quantum entangled photons, quantum optics and quantum information processing with photons.
He has established the photon entanglement and quantum optics experiments for research on quantum information processing and quantum foundations at IISER Mohali. In addition, Dr. Mandip Singh has setup and developed Bose Einstein condensation experiments at IISER Mohali during 2012 to 2015. This is the first experiment which he has developed completely independently at this place from the absolute scratch. Experimental setup involves designing of vacuum system, realisation of UHV, realisation of laser control systems for BEC laser cooling and imaging part, making of an atom chip, control electronics, making of LabView program (control and BEC imaging analysis interface) and execution of experiments. A photograph of the setup is shown on top with an atom chip.
He is also doing research on the development of new ideas of quantum physics and their applications.
News
Latest paper.
Paper on quantum double-double-slit experiment with momentum entangled photons is published in Scientific Reports.
Quantum Experiments with photons
Quantum double-double-slit experiment
Quantum mechanics is based on counter-intuitive principles.
We have performed a detailed experiment on a quantum double-double-slit experiment consisting of two double-slits with momentum entangled photons. Quantum entanglement of photons is such that each photon can reveal the which slit path information of the other photon. However, experiment can be performed in such a way that the which slit path information cannot be recovered after detection of particles. In the later case photons show two-photon interference. A detailed experiment with sound theoretical analysis is presented in the paper.
Schematic of the experiment
Two photon detection amplitude
Two photon detection amplitude
Quantum double double slit experiment.
Two photon detection amplitude
Two photon detection amplitude
Two photon detection amplitude
Probability amplitude of two-photon detection on the screens.
Quantum interference of momentum entangled and path entangled photons
Quantum interference of momentum entangled and path entangled photons
Quantum interference of momentum entangled and path entangled photons
Single photon and two photon interference patterns in the quantum double-double-slit experiment when both photons are path entangled via the slits. Effective wavelength of photons is half.
Quantum measurement of a path of a photon
Quantum interference of momentum entangled and path entangled photons
Quantum interference of momentum entangled and path entangled photons
Interference pattern is not formed if path of any one photon is detected. Path entanglement is collapsed.
Quantum diffraction of Photons
Photon Entanglement and Quantum Diffraction
Quantum entangled state cannot be written in a product form even if individual particles are separated.
In my lab at IISER Mohali, 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. Experimental results are understood based on a continuous variable entanglement quantum model. This is the first experiment on quantum diffraction of quantum entangled photons from a sharp edge that involves continuous variable entanglement.
For details: Phys. Letts. A. 383, 125889, (2019).
Quantum diffraction from a sharp edge
Experimental diffraction pattern of position-momentum entangled photons (dotted). Solid line plot represents a plot generated by a continuous variable entanglement model. Quantum diffraction pattern cannot be visualised by individual photon detectors, neither by a human nor by animal eyes. Such a pattern can be observed in joint detection of both photons known as correlated measurements. One of the interesting aspects of quantum mechanics is that it can recover patterns from completely random outcomes. It is often possible to find out complimentary patterns which cannot be measured simultaneously.
Selected Research
Macroscopic quantum entanglement
This section is about my research on quantum magnetic field and its interaction with atoms.
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)
Macroscopic quantum system
This research work is about generalization of a flux qubit.
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
3D Tomographic imaging of a phase space pattern
Mandip Singh introduced the conceptual idea of localization and imaging of patterns in a phase space. He performed experiments on this concept in 2017 and published it in 2018.
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).
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.
Phase Space Tomographic Imaging
Schematic diagram of experiment. For details: Phys. Rev. A, 98, 053828 (2018).
Teaching Aspect
Addition to research
Dr. Mandip Singh has taught different types of courses of general physics and advance level physics at IISER Mohali since 2012. He is a recipient of best teacher award of the year in 2016. More specifically, he has introduced and developed pre PhD courses on Quantum Principles and Quantum Optics, Nonlinear Optics and Laser Fundamentals and Applications.
He has given public lectures on quantum physics at different colleges and universities and delivered lecture series in conference workshops.
phy-edu
This section highlights published work in physics education research.
In addition to research, Dr. Mandip Singh has developed new methods, which can be useful in teaching curriculum. Two experiments of this project are published.
Paper published in American Journal of Physics was featured on the cover page of the journal, June 2018 issue.
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).
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 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.