Publications & Research Impact

Journal

Certified random number generation using quantum computers

P. P. Nath, A. Sinha and U. Sinha

Front. Quantum Sci. Technol. (2025)

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Reports about this work:

• Indian scientists develop simpler method for quantum-based digital security (by The Times of India).
• Bengaluru scientists achieve breakthrough in un-hackable digital security (by News Karnataka).
• Quantum advance paves way for 'un-hackable' digital future (by Hindustan Times).
• Bengaluru scientists show quantum path to 'unhackable' OTP (by Deccan Herald).
• A SimplyPHY coverage of the work by RRI Outreach team: Episode 26 - Certified Quantum Randomness, One Qubit at a Time | SimplyPHY

Journal

Interference in Quantum Mechanics

U. Sinha and D. Ghosh

J Indian Inst Sci (2025)

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Journal

Intraparticle entanglement in noisy quantum channels: degradation and revival through amplitude damping

A. S. Roy, Namitha C. V., S. Mukerjee, P. K. Panigrahi and U. Sinha

Frontiers in Quantum Science and Technology (2025)

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Reports about this work:

• Noise brings quantum surprise from Indian Scientists (by DST).
• Noise brings quantum surprise from Indian Scientists (by PIB of GoI).
• In quantum, noise may not be the villain after all (by The Times of India)
• A SimplyPHY coverage of the work by RRI Outreach team: Episode 20 - Quantum Noise: Friend or Foe | SimplyPHY

arXiv

Manipulating decoherence: Towards a universal framework

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arXiv

Decoherence manipulation through entanglement dynamics: A photonic experiment

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arXiv

Certified Random Number Generation using Quantum Computers

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Journal

Estimating the link budget of satellite-based Quantum Key Distribution for uplink transmission through the atmosphere

S. R. Behera and U. Sinha

EPJ Quantum Technology 11, 66 (2024)

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Reports about this work:

• https://timesofindia.indiatimes.com/city/bengaluru/ladakhs-hanle-emerges-as-ideal-site-for-quantum-communications-to-space-reveals-rri-study/amp_articleshow/116043084.cms
• https://www.deccanherald.com/india/karnataka/bengaluru/scientists-identify-ladakh-s-astronomical-observatory-as-prime-site-for-quantum-communication-3314038
• https://www.thehindu.com/news/national/karnataka/indian-astronomical-observatory-in-hanle-optimal-location-for-beaming-quantum-signals-into-space-rri/article68955098.ece/amp/
• https://www.businessworld.in/article/himalayan-heights-may-be-key-to-quantum-leap-in-space-communication-study-541455
• https://www.thehansindia.com/business/hanle-in-ladakh-prime-candidate-for-quantum-communications-tech-indian-researchers-927610
• https://tennews.in/hanle-in-ladakh-prime-candidate-for-quantum-communications-tech-indian-researchers/
• https://www.dailyexcelsior.com/ladakhs-hanle-prime-candidate-for-quantum-communications-tech-researchers/

arXiv

Measuring a "Probability" > 1

S. Chakraborti, R. D. Sorkin and U. Sinha

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PRL

Single system based generation of certified randomness using Leggett-Garg inequality

P. P. Nath, D. Saha, D. Home and U. Sinha

Phys. Rev. Lett. 133, 020802 (2024)

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Reports about this work:

• https://timesofindia.indiatimes.com/Indian researchers claim 'Quantum Leap' in data encryption
• https://deccanherald.com/india/New quantum research promises stronger digital data protection
• https://thehindu.com/Raman Research Institute scientists make breakthrough in cybersecurity

Journal

Relating an entanglement measure with statistical correlators for two-qudit mixed states

S. Sadana, S. Kanjilal, D. Home and U. Sinha

Quantum Information Processing (2024)

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Journal

Revealing incommensurability between device-independent randomness, nonlocality and entanglement

S. Sasmal, A. Rai, S. Gangopadhyay, D. Home and U. Sinha

Physica Scripta 99 (2024)

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Patent

METHOD AND SYSTEM FOR GENERATING CRYPTOGRAPHIC KEYS

R. Chatterjee, S. Chatterjee, B. C. Sanders and U. Sinha

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Reports about the patent:

• https://timesofindia.indiatimes.com/city/bengaluru/rri-software-to-simulate-quantum-communication-gets-indian-patent/articleshow/106848734.cms
• https://www.dailypioneer.com/2024/india/indian-patent-granted-for-work-on-secure-quantum-communication.html

arXiv

Daytime and Nighttime QKD over an atmospheric free-space channel with passive polarisation bases compensation

S. R. Behera, M. George and U. Sinha

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Journal

Massive spatial qubits: Testing macroscopic nonclassicality and Casimir entanglement

B. Yi, U. Sinha, D. Home, A. Mazumdar and S. Bose

Phys. Rev. Research (2023)

arXiv

Statistical Correlators and Tripartite Entanglement

S. Khan, D. Home, U. Sinha and S. Jain

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Journal

Noise analysis for the Sorkin and Peres tests performed on a quantum computer

S. Sadana, L. Maccone and U. Sinha

Quantum Information Processing (2023)

Communications Physics

Unambiguous joint detection of spatially separated properties of a single photon

Communications Physics (2023)
Reports about this work:

• https://timesofindia.indiatimes.com/New RRI study could boost quantum tech applications
• https://thehindu.com/indo-french-collaborative-study-can-stimulate-quantum-tech-applications
• https://www.deccanherald.com/rri-research-push-to-quantum-tech-applications
• https://www.anandabazar.com/the-mystery-in-quantum-mechanics-has-been-revealed

Patent Application

Method and System for Random Number Generation From Loophole-Free Leggett-Garg Architecture

P. P. Nath, A. Sinha and U. Sinha

Patent Application

Methods and a System for Optimizing Performance of a QKD Protocol

S. Chatterjee and U. Sinha

Communications Physics

Polarization bases compensation towards advantages in satellite-based QKD without active feedback

Communications Physics (2023)
Reports about this work:

• https://pib.gov.in/PressReleasePage.aspx?PRID=1929340
• https://swarajyamag.com/amp/story/tech%2Findian-scientists-devise-low-cost-method-to-secure-long-distance-communication-by-overcoming-distortions
• https://government.economictimes.indiatimes.com/amp/news/technology/researchers-at-rri-devise-method-of-secure-low-cost-long-distance-communications/100722918

Book Chapter

Photon sources and their applications in quantum science and technologies

U. Sinha, S. R. Behera and M. Layal

Progress in Optics.

arXiv

Generation of intraparticle quantum correlations in amplitude damping channel and its robustness

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Phys. Rev. A

Approximate reconstructability of quantum states and noisy quantum secret sharing schemes

Phys. Rev. A 108, 012425 (2023)

Authors:
Yingkai Ouyang, Kaumudibikash Goswami, Jacquiline Romero, Barry C. Sanders, Min-Hsiu Hsieh, Marco Tomamichel

Book Chapter

Photon Sources for Quantum Technologies

Elsevier Reference Collection in Materials Science and Materials Engineering

Author:
Urbasi Sinha

Resonance

The Experiments that Led to the Nobel Prize in Physics 2022

Resonance: Journal of Science Education, Vol. 28, Issue 1 (2023)

Author:
Urbasi Sinha

arXiv

Spatial Qubit Entanglement Witness for Quantum Natured Gravity

B. Yi, U. Sinha, D. Home, A. Mazumdar and S. Bose

arXiv:2211.03661

Journal

Direct determination of entanglement monotones for arbitrary dimensional bipartite states

D. Ghosh, T. Jennewein and U. Sinha

Quantum Science and Technology (2022)
Reports about this work:

• https://dst.gov.in/indian-scientists-find-efficient-way-quantify-quantum-entanglement-higher-dimensional-systems
• https://www.indiatoday.in/science/story/indian-scientists-push-the-envelope-in-quantum-physics-2283837-2022-10-11
• https://blog.forumias.com/indian-scientists-find-efficient-way-to-quantify-quantum-entanglement-in-higher-dimensional-systems/

Journal

Entanglement protection in higher-dimensional systems

A. Singh and U. Sinha

Physica Scripta 97, 085104 (2022)

Phys. Rev. Research

Testing Quantum Foundations with Quantum Computers

Phys. Rev. Research 4, L022001 (2022)

Authors:
S. Sadana, L. Maccone, and U. Sinha

Reports about this work:

• Nature Portfolio News
• Times of India Coverage

PRX Quantum

Loophole-Free Interferometric Test of Macrorealism Using Heralded Single Photons

K. Joarder, D. Saha, D. Home and U. Sinha

PRX Quantum 3, 010307 (2022)
Reports about this work:

• https://www.nature.com/articles/d44151-022-00022-8
• https://www.newscientist.com/article/mg25233590-800-the-quantum-experiment-that-could-prove-reality-doesnt-exist/
• https://www.deccanherald.com/science-and-environment/an-experiment-that-disproves-einsteins-idea-of-reality-1075195.html
• https://dst.gov.in/einsteins-idea-reality-experimentally-proven-decisively-wrong-indian-scientists-paving-way-more
• https://ramanresearchinstitute.wordpress.com/2022/01/26/einsteins-idea-of-reality-experimentally-proven-decisively-wrong-by-indian-scientists-paving-the-way-for-more-secure-information-transfer/

arXiv

Massive Spatial Qubits for Testing Macroscopic Nonclassicality and Casimir Induced Entanglement

B. Yi, U. Sinha, D. Home, A. Mazumdar and S. Bose

arXiv:2106.11906

PRL

Quantum State Interferography

S. N. Sahoo, S. Chakraborti, A. K. Pati and U. Sinha

Phys. Rev. Lett. 125, 123601 (2020)
Reports about this work:

• https://www.indianweb2.com/2020/09/01/indian-scientists-find-a-new-way-that-can-make-crucial-quantum-operations-simpler/
• https://vigyanprasar.gov.in/wp-content/uploads/vigyan_samachar_dst_01_25Aug2020.pdf
• https://www.mangaloremirror.com/rri-scientists-find-a-new-way-for-quantum-state-estimation-that-can-make-crucial-quantum-operations-simpler/
• https://www.natureasia.com/en/nindia/article/10.1038/nindia.2020.146

Journal

qkdSim: An experimenter's simulation toolkit for QKD with imperfections

R. Chatterjee, K. Joarder, S. Chatterjee, B. C. Sanders and U. Sinha

Phys. Rev. Applied 14, 024036 (2020)
Reports about this work:

• https://medium.com/qiskit/india-is-amid-a-quantum-boom-7ab80870dd0d
• https://timesofindia.indiatimes.com/gadgets-news/dst-researchers-comes-up-with-simulation-toolkit-to-safeguard-secure-quantum-communication-platforms/articleshow/76715116.cms
• https://www.natureasia.com/en/nindia/article/10.1038/nindia.2020.117
• https://vigyanprasar.gov.in/wp-content/uploads/vigyan_samachar_dst_01_29June2020.pdf
• https://www.abplivenews.com/rri-researchers-toolkit-to-assist-safe-communique-india-news-times-of-india/
• https://www.cqai520.com/tech/dst-researchers-comes-up-with-simulation-toolkit-to-safeguard-secure-quantum-communication-platforms/
• https://www.eetindia.co.in/simulation-toolkit-to-safeguard-secure-quantum-communication-platforms/
• https://news.knowledia.com/IN/en/articles/rri-researchers-toolkit-to-aid-secure-communication-aa8c9f982ae0f1b502b3a928d83102734e8ea181
• https://www.fresherslive.com/current-affairs/articles/rri-introduces-qkdsim-toolkit-to-ensure-safety-in-secure-quantum-communication-platforms-26102
• https://www.jatinverma.org/simulation-toolkit-to-ensure-safety-in-secure-quantum-communication-platforms

Journal

Pearson Correlation Coefficient as a Measure for Certifying and Quantifying High Dimensional Entanglement

C. Jebarathinam, D. Home and U. Sinha

Phys. Rev. A 101, 022112 (2020)

Magazine

Quantum Slits Open New Doors

U. Sinha

Scientific American (2020)

Journal

Revisiting comparison between entanglement measures for two-qubit pure states

A. Singh, I. Ahamed, D. Home and U. Sinha

JOSA B 37(1), 157 (2020)

New Journal of Physics

Double-Slit Interferometry as a Lossy Beam Splitter

New J. Phys. 21, 113022 (2019)

Authors:
S. Sadana, B. C. Sanders and U. Sinha

arXiv

Entanglement Certification and Quantification in Spatial-Bin Photonic Qutrits

arXiv:1909.01367 (2019)

Authors:
D. Ghosh, T. Jennewein and U. Sinha

Optics & Photonics News

Single-Photon Sources

Opt. Photon. News 30(9), 32 (2019)

Authors:
U. Sinha, S. N. Sahoo, A. Singh, K. Joarder, R. Chatterjee and S. Chakraborti

Phys. Rev. A

Near-100% Two-Photon-Like Coincidence-Visibility Dip with Classical Light and the Role of Complementarity

Phys. Rev. A 100, 013839 (2019)

Authors:
S. Sadana, D. Ghosh, K. Joarder, A. Nagalakshmi, B. C. Sanders and U. Sinha

Phys. Rev. A

Measuring Average of Non-Hermitian Operator with Weak Value in a Mach-Zehnder Interferometer

Phys. Rev. A 99, 022111 (2019)

Authors:
G. Nirala, S. N. Sahoo, A. K. Pati and U. Sinha

OSA Continuum

Correlated Photonic Qutrit Pairs for Quantum Information and Communication

OSA Continuum 1(3), 996-1005 (2018)

Authors:
D. Ghosh, T. Jennewein, P. Kolenderski and U. Sinha

New Journal of Physics

Measuring the Deviation from the Superposition Principle in Interference Experiments

New J. Phys. 20, 063049 (2018)

Authors:
G. Rengaraj, U. Prathwiraj, S. N. Sahoo, R. Somashekhar and U. Sinha

Reports about this work:

• Physics World Coverage

Current Science

Quantum Frontiers and Fundamentals: Meeting Report

Current Science 115(1) (2018)

Author:
U. Sinha

Annals of Physics

The Quantum Cheshire Cat Effect: Theoretical Basis and Observational Implications

Annals of Physics 391, 1-15 (2018)

Authors:
Q. Duprey, S. Kanjilal, U. Sinha, D. Home and A. Matzkin

JOSA B

Manipulation of Entanglement Sudden Death in an All-Optical Setup

J. Opt. Soc. Am. B 34, 681 (2017)

Authors:
A. Singh, S. Pradyumna, A. R. P. Rau, and U. Sinha

Int. J. Quantum Information

Violation of No Signaling in Higher Order Quantum Measure Theories

Int. J. Quantum Inf. 14, 1650024 (2016)

Authors:
K. S. Joshi, R. Srikanth and U. Sinha

Phys. Rev. A

Measuring Non-Hermitian Operators via Weak Values

Phys. Rev. A 92, 052120 (2015)

Authors:
A. K. Pati, U. Singh and U. Sinha

Scientific Reports

On the Superposition Principle in Interference Experiments

Scientific Reports 5, 10304 (2015)

Authors:
A. Sinha, A. H. Vijay and U. Sinha

Phys. Rev. A

Experimental Test of Environment-Assisted Invariance

Phys. Rev. A 91, 012120 (2015)

Authors:
L. Vermeyden, X. Ma, J. Lavoie, M. Bonsma, U. Sinha, R. Laflamme and K. Resch

Featured Phys. Rev. Lett.

Non-Classical Paths in Quantum Interference Experiments

Phys. Rev. Lett. 113, 120406 (2014)

Authors:
R. Sawant, J. Samuel, A. Sinha, S. Sinha and U. Sinha

Note: Selected as a Focus Article in Physics.

Reports about this work:

• APS Physics Focus Article
• The Telegraph Coverage
• Physics World Coverage
• Phys.org Coverage
• Nature India Coverage
• Science News Coverage

Conference Proceedings

Playing a Quantum Game with a Qutrit

AIP Conference Proceedings 1633, 38 (2014)

Authors:
U. Sinha, P. Kolenderski, L. Youning, T. Zhao, M. Volpini, A. Cabello, R. Laflamme and T. Jennewein

Superconductor Science and Technology

The Effect of Environmental Coupling on Tunneling of Quasiparticles in Josephson Junctions

Supercond. Sci. Technol. 26(12), 125013 (2013)

Authors:
M. H. Ansari, F. K. Wilhelm, U. Sinha and A. Sinha

Nanotechnology

Temperature-Dependent Electron Mobility in InAs Nanowires

Nanotechnology 24, 225202 (2013)

Authors:
N. Gupta, Y. Song, G. W. Holloway, U. Sinha, C. Haapamaki, R. R. LaPierre and J. Baugh

Phys. Rev. A

Aharon-Vaidman Quantum Game with a Young-Type Photonic Qutrit

Phys. Rev. A 86, 012321 (2012)

Authors:
P. Kolenderski, U. Sinha, L. Youning, T. Zhao, M. Volpini, A. Cabello, R. Laflamme and T. Jennewein

Conference Paper

Implementing the Aharon-Vaidman Quantum Game with a Young-Type Photonic Qutrit

CLEO: QELS-Fundamental Science, Paper QM2H.7 (2012)

Authors:
P. Kolenderski, U. Sinha, L. Youning, T. Zhao, M. Volpini, A. Cabello, R. Laflamme and T. Jennewein