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Ravi Kunjwal

Portrait de Ravi Kunjwal
Phd: Institute of Mathematical Sciences, Chennai 2016

Area of Research:
Email: rkunjwal@perimeterinstitute.ca
Phone: x7612

AFFILIATIONS

August 2010 - August 2016: The Institute of Mathematical Sciences, Chennai

Research Interests

I work on quantum foundations, primarily from the perspective of quantum information. Much of my research has been devoted to characterizing the nonclassicality that quantum theory allows, and the nonclassicality it forbids. This requires, firstly, a notion of classicality, relative to which one can judge the nonclassicality of quantum theory. Further, for this notion of classicality to be widely applicable and experimentally testable, it should make minimal assumptions about the theoretical model -- quantum or otherwise -- that describes an experiment, and it should be able to handle real-world experiments that do not always satisfy the idealizations presumed in a theoretical model, e.g., the idealization that measurements in a quantum experiment are all projective. The notion of nonclassicality I have been spending a lot of time thinking about is called contextuality and it satisfies many of these features when appropriately operationalized from its origins in the Kochen-Specker theorem. Quite a lot of my research has been about obtaining noise-robust noncontextuality inequalities whose experimental violation can witness contextuality, thereby certifying that the experiment has met a stringent criterion for nonclassicality under very minimal assumptions about the theoretical model describing the experiment. In particular, violation of these inequalities can benchmark the quantumness of an experiment, where ``quantumness" is understood as a departure from classicality, i.e., nonclassicality of quantum theory.

I have also been interested in the interplay of contextuality with two other notions of nonclassicality: Bell nonlocality and the incompatibility of observables. In particular, Bell inequality violations witness a strong form of nonclassicality akin to contextuality, and both of these notions of nonclassicality require incompatibility of measurements and/or incompatibility between preparations.

Positions Held

  • 2012 - 2016, The Institute of Mathematical Sciences, Chennai, India, as a Senior Research Fellow, pursuing Ph.D. in Theoretical Physics.
  • Fall semesters of 2013-2015, Visiting Graduate Fellow, Perimeter Institute for Theoretical Physics, Canada
  • 2010 - 2012, The Institute of Mathematical Sciences, Chennai, India, as a Junior Research Fellow, pursuing M.Sc. in Theoretical Physics.

Awards

  • Tushar Nagia Stephanian Prize, St. Stephen's College, 2009-2010.
  • KPMG Scholarship, St. Stephen's College, 2009-2010.
  • Nishi Kant Essay Prize, St. Stephen's College, 2009-2010.
  • INSPIRE Scholarship for Higher Education, Department of Science and Technology, Government of India, 2007-2010.

Recent Publications

  • M.D. Mazurek, M. F. Pusey, R. Kunjwal, K. J. Resch and R.W. Spekkens, An experimental test of noncontextuality without unphysical idealizations, Nature Communications 7:11780 (2016), arXiv: 1505.06244 (2015).
  • R. Kunjwal and R. W. Spekkens, From the Kochen-Specker theorem to noncontextuality inequalities without assuming determinism, Phys. Rev. Lett. 115, 110403 (2015), arXiv: 1506.04150 (2015).
  • R. Kunjwal, Fine's theorem, noncontextuality, and correlations in Specker's scenario, Phys. Rev. A 91, 022108 (2015), arXiv: 1410.7760 (2014).
  • R. Kunjwal, C. Heunen, and T. Fritz, Quantum realization of arbitrary joint measurability structures, Phys. Rev. A 89, 052126 (2014), arXiv: 1311.5948 (2013).
  • R. Kunjwal and S. Ghosh, Minimal state-dependent proof of measurement contextuality for a qubit, Phys. Rev. A 89, 042118 (2014), arXiv: 1305.7009 (2013).
  • R. Singh, R. Kunjwal, and R. Simon, Relative volume of separable bipartite states, Phys. Rev. A 89, 022308 (2014), arXiv: 1307.1454 (2013).
  • Beyond the Cabello-Severini-Winter framework: making sense of contextuality without sharpness of measurements, Ravi Kunjwal, arXiv: 1709.01098 [quant-ph] (2017)
  • From statistical proofs of the Kochen-Specker theorem to noise-robust noncontextuality inequalities, Ravi Kunjwal and Robert W. Spekkens, arXiv: 1708.04793 [quant-ph] (2017)
  • Contextuality beyond the Kochen-Specker theorem (PhD thesis), R. Kunjwal, arXiv: 1612.07250 [quant-ph] (2016)
  • A note on the joint measurability of POVMs and its implications for contextuality, R. Kunjwal, arXiv: 1403.0470 [quant-ph] (2014)

Seminars

  • Irreducible noncontextuality inequalities from the Kochen-Specker theorem, Contributed talk, at the Conference on Quantum Information and Quantum Control VII (CQIQC-VII), 2017, at Fields Institute, Toronto, Canada.
  • How to go from the Kochen-Specker theorem to experimentally testable noncontextuality inequalities, on July 18, 2017, at the University of Queensland, Brisbane, Australia.
  • Irreducible noncontextuality inequalities from the Kochen-Specker theorem, on July 6, 2017, at Quantum Physics and Logic (QPL), 2017, Nijmegen, The Netherlands.
  • Irreducible noncontextuality inequalities from the Kochen-Specker theorem, on June 14, 2017, at the Group of Applied Physics, University of Geneva, Geneva, Switzerland.
  • A road to contextuality via Specker's parable, on June 8, 2017, at University of Turku, Turku, Finland.
  • Irreducible noncontextuality inequalities from the Kochen-Specker theorem, on June 4, 2017, at Quantum Contextuality in Quantum Mechanics and Beyond (QCQMB), Prague, Czech Republic.
  • Irreducible noncontextuality inequalities from the Kochen-Specker theorem, on May 31, 2017, at Universitat Autonoma Barcelona (UAB), Bellaterra (Barcelona), Spain.
  • Irreducible noncontextuality inequalities from the Kochen-Specker theorem, on May 30, 2017, at The Institute of Photonic Sciences (ICFO), Castelldefels (Barcelona), Spain.
  • What are the simplest noncontextuality inequalities obtainable from KS-uncolourable hypergraphs?, on December 29, 2016, at The Institute of Mathematical Sciences (IMSc), Chennai, India.
  • Contextuality in the presence of noise, on December 19, 2016, at the Random Interactions seminar at Tata Institute of Fundamental Research (TIFR), Mumbai, India.
  • Noncontextuality inequalities for Specker's compatibility scenario and beyond, on June 8, 2016, at Quantum Physics and Logic (QPL), 2016, University of Strathclyde, Glasgow, Scotland (UK).
  • From the Kochen-Specker theorem to noncontextuality inequalities without assuming determinism, Quantum Physics and Logic (QPL) 2015, on July 15, 2015, at the University of Oxford, Oxford, England (UK).
  • Fine's theorem, noncontextuality, and correlations in Specker's scenario, on February 24, 2015, at Young Quantum 2015, Harish-Chandra Research Institute (HRI), Allahabad, India.
  • Minimal state-dependent proof of measurement contextuality for a qubit, Short talk, on August 27, 2013, at the 13th Asian Quantum Information Science Conference (AQIS) 2013, at the Institute of Mathematical Sciences (IMSc), Chennai, India.
  • PIRSA:17070059, How to go from the KS theorem to experimentally testable noncontextuality inequalities, 2017-07-28, Contextuality: Conceptual Issues, Operational Signatures, and Applications
  • PIRSA:14010102, Noncontextuality without determinism and admissible (in)compatibility relations: revisiting Specker's parable, 2014-01-14, Quantum Foundations